Motor Drive Unit MA 7 PDF Operating Instructions

MOTOR DRIVE UNIT MA 7 Operating Instructions  M MASCHINENFABRI...

MOTOR DRIVE UNIT MA 7 Operating Instructions  M MASCHINENFABRI REINHAUSEN BA 40/02 en — 0694/7000 Maschinenfabrik Reinhausen GmbH Printed in Germany Postfach 12 03 60 93025 Regensburg Telefon (09 41) 4 0 90-0 Telefax (09 41) 4 4 2 0 3 Telex 6 5 881 MOTOR DRIVE UNIT M A 7 Operating Instructions No. 40/02 Contents Page TR C1 - 4 | 3 2. Technical data.........ccocrinmiiricinimisinnsnnssinisessiansss sme semsesssssanssessasens 5 3B. DESIGN c o r r e s s a n s a ene 6 4, Function principle... rer crecsinieniniiisemsecrenseenmnsssssassesnnensarsssnssssssans 10 5. ASSEMDIY.....ccoirriiirciiinirr nnn r e s senses asses sarranean 15 Please note: _. © 6. Putting into operation..........e r e c e s t t s s e m t i a s s a t s a r nreser ar ras tneabies ee annte sane eran 17 The pictures, drawings and circuit diagrams contained i n these , Operating Instructions may differ 7. Maintenance DT TL RL rrr Tru AERP OP TTT) 17 in detail from the motor drive unit delivered. They are for reference 18 ; : only and are subject to change 8. Special deSIgNS.........ccveeeirerectinerariinseseresenesensassenssnsassssensnnssemsisss sssnse without notice. 9. APPENAIX....cccccceerrerreriennreserereseerannteresssstaresssssnaneesnrsnssmsss assess yesonasannas 19 1. GENERAL Themotor drive (fig. 1 , 2) serves to drive the tap changer to the selected - operating position. The motor drive housing contains all mechanical and electrical parts necessary for operating the tap changer. The control follows the step-by-step principle, i.e. for operating the tap changer from one service position to the next one the motor drive operation is initiated by a single control pulse and accomplished without any possible interruption. Overrunning the end positions is pre- vented by electrical and mechanical limits. Further safety and monitoring equipment facilitates the service. Attention: The motor drive’s transmission gear has a belt gear with firm coupling which will block but not uncouple i n the e n d positions. Always keep this feature i n m i n d when adjusting the motor drive. The motor drive is available with motors of varying power and current so that every possible combination of tap changers may be operated by the motor drive (table I). To adapt the motor drive to any service requirements and to existing plants it can be provided with supple- mentary equipment. The motor drive unit is available in two different cabinet sizes, M A 7 or MA 7/8 (enlarged housing). In general the MA 7 cabinet will meet the require- ments. CAUTION: The motor drive unit i s t o b e used only for operating the associated tap changer that bears the same serial-no. Installation, electrical connection and putting into service of the motor drive unit must b e carried out b y qualified, skilled personnel only, according t o these Operating Instructions. D o not alter o r modify the equipment without consulting MR beforehand. Motor drive unit MA 7, MA 7/8 Improper work during installation, electrical connection and putting Rated motor power 0.55 kW 0.75 k W| 1.10 k w into service of the motor drive may Type A affect the trouble-free operation of TypeV V I I 200Y/A motor drive unit, tap changer and V i l 350Y/A transformer. V 11 500Y/A V1200 3xVI200 V1350 3xVI1350 V1700 3xVI1700 Type H H Hi 400Y/A H I l 400A-123 H Ill 400A-145 Type MS MS [ll 300 M S| 301 3 x MS 1301 Type M M iil 350 M Ill 500 M Iii 600 M1351 3x MI351 M I 501 3 x M1501 M | 601 3xMI1601 M802 3xMI1802 M1200 3xM11200 M11500 3x M1500 M 11800 3 x M11800 Type RM RM Ill 600 R M| 601 3 x RMI1601 RM | 1201 3 x RM 11201 RM | 1502 3 x RM 11502 Type R R i l 1200 R 12002 3 x R 12002 R 12402 3 x R12402 R 13000 3 xR 13000 R 13600 3 x R 13600 Type G G l 1602 3) G Ili 2002 on G l l l 2500 on Gl11612 on [J G 11612/DW G 12012 [ [J G 13022 Table | G 1 3022/DW Rated motor power required G 14500 with different tap changer models Note: 1) Without change-over selector only 2. TECHNICAL DATA Motor drive unit ’ M A 7 , M A 7/8 Motor ratings Power 0.55 kW 0.75 kW 1.10 kW 1.50 kw" Please note: The technical data contained herein apply to the standard Voltage 220/380 V Ds design only. They may differ from the equipment delivered and may be Current 291.7A 35/20A 48/28 A 6.739 A subject to alterations, Frequency 5 0 Hz Synchronous speed 1500 1/min Revolution of drive shaft per a3 switching operation Running time per switching 2) operation approx. 5 8 Rated torque on drive shaft 13 Nm 18 Nm 26 Nm 35 Nm Revolutions of hand crank per switching operation 3 Max. number of operating postions 35 (70 or 105)" Voltage for control and heater 220 V 1-ph. Power consumption of 52 VA (when energized) control circuit 2 4 VA (during running time) Heater power, permanent 30W controlled by thermostat M A 7 : 1 0 0 W , MA 7/8: 150 W Test voltage to ground/ without motor 2.5 kV rm.s., 1 min Weight MA 7 : approx. 90 k g MA 7/8: approx 130 kg Note: 1) Special design 2) Reduced running time as special version Cabinet light-metal cast, two parts (tank and cover), outdoor design, protection IP 54. Gearing transmission gear as Poly-V-belt gear, maintenance-free, flanged-on motor, mechanical end position limit in both end positions, control gear mounted to transmission gear, maintenance-free. Electrical control. step-by-step gear, running time controlled by cam performing one revolution per step, running-through control possible, local control by push-buttons, connection facility for remote control via push-button or voltage regulator. Safety devices electrical and mechanical end position limits, motor protective switch with connection for remote control (emergency-off push- button), automatic restart after temporary control voltage break-down, safety circuit to avoid false phase sequence and running-through of operating positions, safety switch for switching off the motor and control circuit in case of manual operation. Monitoring equipment lamp signalling the tripping of the motor protective switch, connection facility for »tap-change-in-progress« indication, mechanical 6-figure operation counter. Position indication mechanical position indicator, indication of a switching step by the tap change indication wheel with 33 sections, contact range with potentiometer for pointer instrument or contact range for lamp panel alternatively. Hand crank for emergency service and adjustment purposes. 3. DESIGN 3.1 Mechanical equipment 3.1.1 Housing The housing consists of two parts, the tank and the cover, both manufactured from corrosion-proof light-metal m casting. 12 The housing is finished with a primer ne and a top coat (colour RAL 7033). The cover can easily be swung open.The opening direction has to be CT 46 indicated in the order sheet. The 5c 15h surfaces between cover and tank are 1N6—- protected by a ledge and sealed by 12 sectional rubber. n= 1420 an The apertures for drive shaft, inspec- tion glass, hand crank and push- buttons are sealed so that the housing is well protected against jets of water. For airing the housing there are two labyrinth apertures in the rear side of the tank. The bottom of the tank consists of three plates for the cable entries. » 1% 7 3.1.2 Gear (see fig. 3, schematic illustration) The gear comprises transmission gear and control gear. ti Hr The transmission gear (fig. 4) is a low- —| Number of teeth noise, maintenance-free belt gear. Crank rotation sense: | Module The transmission element is a wear-. clockwise means Revolution per minute nnn 3 i »Raise« J Revolution per switching operation resistant Poly-V-belt made of synthetic material which is adapted in width to ‘wo the respective motor power. The belt gear is adjustable and must not come © ny, 233 into contact with lubricants. Fig.3 Gearing layout The control gear (fig. 5) is fixed to one DRIVE GEAR CONTROL GEAR side of the transmission gear. It in- 1 Driving motor 101 Intermediate gear 115a Double arm lever cludes a cam disc for mechanically 2 Driving wheel 102 Cog wheel 115b End position lever operating the cam switches, the tap 3 Driving wheel 103 Tappet 115¢ End position lever 4 Driving shaft 104 Tap change indication wheel electrical change indication whee! and the 5 Latch 105 Inner cog plate 115d End position lever position indication wheel. 6 Latch shaft 106 Planet pinion mechanical 7 Bevel gear 107 Inner gear rim 116 Operation counter 8 Shaft for manual operation 108 Pos. indication wheel 117 Counteramm 9 Bushing 109 Stop 118 Step-by-step switch 10 Lever for safety switch 110 Electr. limit switch 119 Pinions 11 Signalling contact 111/112 Leading contact for 120 Cam switches 12 Safety switch, control circuit in additional control and motor circuits pos. 1/n 121 Position transmitter 13 Hand crank 113/114 Switch for control 122 Contactamm 1 4 Coupling pin circuit and motor 123 Couplings 15 Poly-V-driving belt circuit in pos. 1/n 124 Drag rings 125 Coupling pin 126 Guide The tap change indication wheel as well as the cam disc perform 1 revolu- tion per step. The green field indicates the rest position of the cam switches. The initial position for a tap change operation is indicated by the red center mark in the green field. 3.1.3 H a n d crank The hand crank provided with a plastic handle is attached to the outside of the housing by a wing nut clamp. 3.1.4 Operation counter The mechanical counter records the switching operations performed. To read the counter it is not neces- sary to open the housing. As the reset wheel is perforated, the counter may be lead-sealed. To set the counter to a definite number, the screen of the mechanical position indicator has to be dismoun- ted. The counter is then unscrewed from the screen. After loosening 2 screws the counter unit can be re- moved from the housing and is then ready to be set to the given number. Proceed: in the reverse order to remount the counter. fFre2 a>0 200 000 o h ° v { 1 a 3.2 Electrical equipment (fig. 6) Standard equipment S5 (Designations according to Push-button for tripping the motor circuit diagram 31 331 TSR) B1 protective switch Q1 Thermostat Westinghouse, push-button type Please note: The equipment, desig- nation of components and circuit ECO, type RTR 3521, T11AH10, switching element setting range 0... + 30°C. 233 EA11,1 NO + 1 NC contact, with diagrams described herein apply to lamp socket (for lamp H1) the standard design only. It may differ H1 from the equipment delivered and may Lamp signalling the tripping of the S6/S7 be subject to alterations. motor protective switch Q1, Limit switch for position n / position 1 , Rafi, type LG 233 with socket BA9s Marquart, nr.1330.0401, three-pole design for 380 VAC, 25 A K1 /K2 leading limit switch contact: Motor contactor for control direction. Honeywell, type BZ-2 RW 822-A2 »Lower« (towards position n), motor turns counterclockwise/»Raise « s8 (towards position 1) motor turns Safety switch for manual operation clockwise, ABB, type B9-40-22, Marquart, nr.1330.0401three-pole four-pole design, auxiliary contacts: design for 380 VAC, 25 A 2 N O + 2 NC. S12/S14 K3 Cam switches for control direction Brake contactor »Raise« (towards position 1)/ ABB, type K55 E, »Lower« (towards position n), contacts: 5 NO + 5 N C Honeywell, type BZ-3 YWT822, two- pole change-over switch (1 N O + 1 NC K20 with common base) Auxiliary contactor for step-by-step operation, ABB, type K44 E , S13 contacts: 4 NO + 4 NC Cam switch for step-by-step operation, for details see S12 M1 Driving motor, squirrel cage rotor, S40 ratings see section 2 Position transmitter for lamp panel (see appendix, circuit diagram 0] 00 525 TM) Motor protective switch, Siemens, type 3VU13, with thermic and magnetic alternatively: tripping, three-pole design with 2 auxiliary contacts (1 NO + 1 NC), Resistance position transmitter for open-circuit remote tripping pointer instrument (see appendix, circuit diagram 00 885 TM), resistance R1 per step according to the number of Heater, Rosenthal, type ZWS 100, positions: 5,10 o r 2 0 ohms, total resistance approx. 1600 ohms resistance up to 200 ohms, other resistances on request. R2 same as R1, but resistance 500 ohms X20 (MA?) or ZWS 100/350 ohms (MA7/8) Intermediate terminals, respectively Phonix, type UK5-TWIN 1/82 Terminal bars, Phonix, K4/E or Push-button for control direction SL KG 1 0 alternatively »Lower« (in direction of position n)/ »Raise« (in direction of position 1), Westinghouse, push-button type T11 AH50, switching element 233 E11, 1NO+1NC 4J o a o v a c aYS T iace 4. FUNCTION PRINCIPLE Circuit for tap-change-in-progress Prerequisite: indication and monitoring Motor protective switch Q1, safety 2 auxiliary contacts of the motor switch S8, limit switches S6, S 7 4.1 Current circuits contactors are connected to terminals closed (fig. 7a). (see appendix, circuit diagram 18/19, 20 in parallel. If the indication Voltage at L 1 , L 2 , L3: 380'V, 31 331 TSR, standard design) shall indicate the switching direction, three-phase, 5 0 H z the bridge between terminals 19 and Voltage at L 1 , N : 220 VAC, 5 0 H z All current circuits are separately 20 has to be removed. connected to terminals. Motor circuit Circuit for remote position The motor terminals U1, V1, W 1 are indication (see appendix, circuit connected to the power source via diagrams 00 885 TM and 00 525 TM). brake contactor K3, motor contactor The position transmitter for the lamp K1 /K2, limit switch S6/S7, safety panel intermittently switches from one switch S8, whereas motor protective position contact to the next. switch Q1 is connected to L1, L2, L3 The sliding contact and the position via the terminals 2 , 3 , 4. contacts of the contact range are connected to terminals. Heater circuit "The heater circuit is connected to L1, The resistance position transmitter for N via the terminals 8 and 9. remote indication via pointer instru- The heater resistor R1 is permanently ment switches from one position connected, whereas the heater resis- contact to the next without interrup- tor R2 is switched on via thermostat tion. For n service positions n-1 step Bi. resistors are installed between the position contacts. Beginning and end Control circuit of the contact range as well as the The control circuit is connected to L1, sliding contact are connected to N via terminals 1 2 and 13, with the terminals. motor protective switch Q1 and safety switch S8 interconnected so that the control voltage is interrupted when Q1 4.2 Operation Operation: or S8 is operated. The tripping circuit (see appendix, circuit diagram (Control towards position n) of motor protective switch Q1 is 31 331 TSR) Push-button S 1 is operated, closes interlinked with the control circuit. 13-14 for energization of K1, opens The motor protective switch Q1 is 4.2.1 Control (see fig. 7a... 7e) 21-22 for blocking K2. provided with an open-circuit trip K1 is energized, closes 1-2, 3-4 in the The motor drive control follows the motor circuit, opens 21-22 for blocking which can be energized via push- step-by-step principle, i. e. after of K2, opens 31-32 for Q1 and seals in button"S5 (in the motor drive unit) and energization the switching operation is 13-14; K1 closes moreover 5-6 for the $ 9 (in the control room) and via the automatically and irrevocably accom- brake contactor K3, which is ener- safety circuit. plished, independent of whether the gized, K3 opens the short-circuit The safety circuit consists of switching push-buttons S1...S4 have been connection 61-62, 71-72, 81-82, 91-92 elements of the cam switches S12, operated during the running time of in the motor circuit and connects the S13, S14 and of auxiliary contacts of the motor drive. Another switching motor to the voltage source 13-14, motor contactors K1 and K2. operation is only possible when the 23-24, 33-34, K3 closes 43-44 The tripping of the motor protective control system is again in its rest (fig. 7b). switch Q1 is self-interrupting. position. The rest position of the cam Current circuit for indication of the switches controlling the running period The motor M1 starts (counterclock- motor protective switch tripping is indicated by the green zone on the wise rotation). This circuit is connected to LL1, N via tap change indication wheel, with the the terminals 16, 17. The signalling middle of this zone marked red. lamp H1 is installed in the emergency off-push-button S5 of the motor drive unit. 10  ! a grrr 15 | TN a | 11 | ” eLZOCE 24 A. wh| 13 14 & s8 " x2 x20 ls 7 1 [61 81 [94 K3 72 [62 1 ) Fe———- ————————————1 falar |I gal EJa( u | | 2) 11 J12 a 20 3das 3 ‘ea wl | 13 0 J 14 s8 i| x2q2 xa0gt x 2 04 21 43 [21 s2 K3 [ S1 22 ” Iz Jy sepd? [egpd® 14 | - [ 61 |81 lo Fr K3 72 |62 33 K20\ 34 K20 11 Step-by-step operation: — [x] The direction-memory cam switch S14 -T — — — — —a mm ee 1 is actuated and closes at contacts NO1-C or K1 and NO2-C for Q1 || BX F 1 sa x4 1 1 [12 = 29 2826 24 23 22 (fig. 7c). ol Cam switch S13 closes at contacts 13 a1 NO1-NO2 and opens at NC1-NC2 in 14 the safety circuit for Q1. 5 Auxiliary contactor K20 is energized, s8 v x2q2 x2004 opens 51-52, 61-62, 71-72 and closes 13-14, 23-24, 33-34 (sealing-in) 43-44. 21 When K20 has opened at 71-72, K1 is 52 22 kept in energized condition only via ERE cam switch S14 (fig. 7d). 7 x20 2 Before the motor drive stops, the cam EY {71 switch S13 opens at contacts K20 [——— s 2 [72 NO1-NO2 and closes at contacts S14 |c 13 NC1-NC2 in the safety circuit for Q1. | NO S6 K1][ NC J14 (fig. 7e). s S6€ v Stop: ) The direction-memory cam switch S14 5 5 24 also opens at contact NO1-C for K1 K1 | K2 K2 s 22 and NO2-C for Q1. A Ad K3 K1 Motor contactor K 1 drops, opens 1 -2, a2 a2 3-4, in the motor circuit, a n d 5-6,13-14 x1%a a er in the control circuit, closes 21-22, | Nl 31-32. Auxiliary contactor K20 is sealed-in via its contact 33-34 and via 43-44 of the brake contactor K3. Lt — F————— ————— mm ——— —1 Braking: || 5 Fs — —= { Ne sa B | 5 When motor contactor K1 opens at X14 12 = 29 Gass 24 a 5-6, the brake contactor K3 drops, disconnects the motor M1 at 13-14, 23-24, 33-34 and closes the short- circuit connection at the motor termi- nals U1, V1, W1 via contacts 61-62, X22 71-72, 81-82, 91-92. The motor M1 is stopped (fig. 7a). X20 4 At the same time K3 opens 43-44, 43 K3 [ which results in K20 being deener- 44 gized, closing 51 -52,61-62, 71-72 and S56 EB) opening 13-14,23-24,33-34, 43-44. K20, however, only drops if the push- button S1 (S2 resp.) is not depressed. If S1 (S2 resp.) is depressed, K20 is sealed-in via 13-14 (23-24 resp.) and prevents energization of K1 (K2 resp.) K20/ via K20 contact 51-52 (61-62 resp.). 12 Control towards position 1 : h Wet ea Push-button S2 i s operated. Motor | =~ _ 3 1 1 contactor K2 is energized. Motor M1 : BL _X B | 2 turns clockwise. Direction-memory xg liz SSL 24 2 cam switch S12 is operated. | lo The further control equals that towards arr position n. 4 The switched condition of the control s8 i x202 x20}4 equipment during the switching se- quence for changing from one tap to the next one (0-33 sections on the tap ™ change indication wheel) is given in Kar, fig. 8. Je 7 2 114 LE] 24 S14 13 " 2a loro kao) 34 K1 2 - K 2 0\ a A1 K3 K20 A2 A2 xT hs 27 i Ni 0 5 10 15 20 25 30 33 S1(S2) K1(K2) K3 Sis) |__| si | I K20 |____ Fig.8 Switched condition of the control equipment during the switching sequence for changing from one tap to the next one ( = 33 sections on the tap change indication wheel) Switching-on sequence: S1 (S2), K1 (K2), K3, S14 (S12), S13, K20 Switching-off sequence: S1 (82), S13, S14 (S12), K1 (K2), K3, K20 13 4.2.2 Running through to an end 4.2.5 Control voltage outage position. (position n or position 1) If after a control voltage outage during Shortly before the motor drive arrives the running time of the motor drive the at the end position (fig. 9) the leading voltage is present again, the motor limit switch S6 (in position n), or S7 (in drive automatically restarts in the position 1 ) , opens contact NC-C so direction in which it had previously that the motor contactor K1 (or K2) been controlled. The switching opera- can no longer be energized. tion once started is achieved by When the end position is reached, S6 means of the direction-memory cam (or S7) opens the contacts S-V, R-U, switch S12 (or S14 resp.) which is still T-W which leads to interruption of the actuated. In this case the safety circuit motor circuit and the seal-in circuit of does not operate, because the cam motor contactor K1 (or K2). switch S13 has already been oper- ated. 4.2.3 Hand crank operation (fig. 10) 4.2.6 Voluntary tripping of the motor The hand crank must b e fitted o n t h e protective switch Q1 shaft and pushed back. The motor protective switch Q1 may At the same time the safety switch S8 be tripped by operating the emergen- is operated. This switch breaks the cy-off push- button S5 of the motor motor circuit and the control circuit. drive unit or by operating the After the manual service the hand emergency-off push- button S 9 in the crank is removed from the shaft. control room, which is connected in The safety switch S8 closes again. parallel. While manually operating the drive The motor protective switch Q1 is observe the tap change operation reset by operating the switch lever on wheel which indicates the mechanical the motor protective switch (fig. 12). sequence of the switching operation. For this purpose the motor drive The wheel (see fig. 11) is divided into housing has to be opened. 33 sections, 4 of which are marked green. Within the green-marked zone the mechanically operated cam switches are in rest position. The red mark indicates the middle of the green zone. In order to prevent automatic restart after hand crank operation the motor drive has to be eranked into the green zone of the tap change indication wheel. 4.2.4 False phase sequence if the phase sequence at the terminals at that moment the cam switch S13 L1,L2,L3 is mixed up the driving motor (contact NC1-NC2) has not yet been M1 turns in the wrong direction. If, i n operated. If the motor turns in the this case, the motor contactor K1/K2 is opposite direction, the same accord- energized, the cam switch of the op- ingly applies for cam switch S12 and posite direction S12/S14 is operated. motor contactor K2. The fact is used in the safety circuit of Moreover, the motor protective switch the control circuit. Consequently, the is also tripped when at the beginning motor protective switch Q1 is tripped, of a switching operation the motor when for example, with contactor K 2 drive is energized by the direction- being energized the switching ele- memory cam contact S12/S14 instead ments of cam switch S14 (contact of via push-button S2/S1 (unintended N02-C) and of the motor contactor K1 automatic passage of service posi- (contact 31-32) are closed and when tions). 14 5. ASSEMBLY 5.1 Mounting the motor drive unit to the transformer tank (see appendix, dimension drawing 895 660 for MA 7 and 895 661 for MA 7/8) The motor drive unit is mounted by means of 4 studs fixed at the trans- former tank. The corresponding through-holes are on both sides of the housing.The position of the bolts has to b e adjusted to the axis of the crank shaft so that the correct dimension V1 is obtained (fig. 13). Take care that the motor drive unit is mounted vertical and that its drive shaft is in correct alignment with the shaft of the bevel gear. If the transformer causes extremely Motor drive unit M A 7 Motor drive unit M A 9 heavy mechanical vibrations the use of vibration dampening connectors is recommended. Fig. 13 Attachment of the housing, reference dimension V 1 5.2 Mounting the drive shaft and the (between centres of hand crank and bevel gear) bevel gear (see Operating Instructions No. 42) 5.3 Coupling of tap changer Symmetrical coupling i s achieved and motor drive a s follows: It is absolutely necessary that the tap — Adjustment must be carried out by changer operation is finished before manual operation. the motor drives stops. — On every adjustment make sure This is ensured by setting the time of that the position indication reading the selector or diverter switch opera- of both motor drive and tap chan- tion (on-load tap change operation) at ger are identical. a distinct interval before the end of the ~ Tap changer and motor drive must motor drive action (1.5... 2 sections be in the adjustment position. before the red center mark on the tap change indication wheel). This red — Couple tap changer and center mark is used as a reference motor drive. when adjusting. THB ERE put reog. — Turn crank in one direction until ATL ) bb ICHO One tap change operation corres- selector or diverter switch operation ove ponds to one revolution of the tap occurs. Count the remaining sec- change indication wheel. The tap tions until the red center mark of change indication wheel is divided the tap changer indication wheel is into 33 sections with one section visible in the middle of the inspec- corresponding to one revolution of tion window. the crank. — Repeat this procedure in the The number of sections, counted from opposite direction. the beginning of the tap change ope- ration until the red center mark of the indication wheel faces the mark on the inspection window, should be equal in both rotation senses. Minor asym- jz 1 AR0RNNNANaN. N u o n metry is admissible. 15  If there is a difference between the numbers of sections counted i n both directions, the motor drive must be readjusted in relation to @ the tap changer by half this 0 5 10 15 20 25 30 33 difference of numbers. | Example (see fig.14) | S=aiNNERNNRNRNDRRNNNNNNNERREE [BK 11 1h Operation of a) Tap changer is in operating posi- — diverter switch 33 3 25 20 15 10 0 tion 10. Turn crank towards 11 until | diverter switch operation occurs. Count the number of sections until CLT ARANNNENRRRRRNNREZEEE (O° TT] red center mark appears. Operation of diverter switch Result: 7 sections 0 S 10 15 20 25 30 33 J b) Tap changer is in operating posi- tion 11. Turn crank towards 1 0 until TT THE 10 [___ Operation of diverter switch operation occurs. diverter switch Count the number of sections until red center mark appears. Result: 1.5 sections Correction value: 1/2 (7 sections-1.5 sections) = Uncoupling 2.75 sections, chosen 3 sections. ¢) Turn crank towards position 11 0 3 until red center mark appears. d) Uncouple vertical drive shaft. e) Turn on in the same direction (towards position 12) by 3 sections. Coupling f) Couple again. S 10 15 20 g) Turn on in the same direction (as | with e) until diverter switch action IRAN occurs. Count number of sections Lr until red center mark appears. l__ Operation of Result: 4 sections. 33 30 25 20 5 10 g ~~didvergrswic itch ] i h) Check in the opposite direction. a 1 | Result: 4.5 sections. = 1 nu h —— Operation of diverter switch Coupling of tap changer to the motor drive is sufficiently symmetrical. Fig. 1 4 Coupling of motor drive t o the tap changer a , b -~ Counting sections after diverter switch operation i n both directions ¢ ~— Cranking in the direction of the higher number of sections d ~— Uncoupling e -— Cranking on by correction value f — Coupling g ~— Completing operation, checking number of sections h — Checking in the opposite direction 16 5.4 Preparing the electrical block after 2... 3 revolutions of the 7. MAINTENANCE operation hand crank. Now turn in the reverse direction until the drive arrives i n the The electrical leads to the motor drive penultimate position. As the transmission gear is a main- unit must be connected according to tenance-free Poly-V belt drive and the The same procedure must be applied the wiring diagram. when the other end position is tested. ball bearings of the driving motor are sufficiently supplied with grease, For changing from manual to motor- Changing from manual to motorized regular maintenance is not necessary. ized operation the hand crank is to be operation is performed as indicated in We recommend, however, occasional removed, which results in the electri- section 4.2.3. inspections which should focus on: cal motor blocking (safety switch) being cancelled. — rainproofness of the housing 6.1.3 Operational test of the limit switch (electrical limitation of — proper function of electrical heater the end position) (check heater and thermosat) Run the tap changer to one end po- ~ the appearance of the equipment sition. Further control in the same in the motor drive unit direction must not result in any motor We recommend to perform some test drive operation. Motor drive operation 6. PUTTING INTO operations during these inspections. is, however, possible in the opposite OPERATION Furthermore the function of the limit direction. When testing the other limit switches should be checked. switch the same procedure must be applied accordingly. 6.1 Operational tests WARNING: It m a y b e more con- venient t o perform the operational 6.2 Transport of the transformer test, a s described below, with the OLTC and motor drive unit must be protective housing open and the set to the adjustment position if the supply voltage connected. I n this motor drive has to be uncoupled and case, please strictly observe the removed from the transformer for respective safety regulations. transportation purposes. The un- Before applying the supply voltage for coupled shaft ends must be secured motor circuit, control and auxiliary against arbitrary turning. circuits check whether voltage, Perform reinstallation of the motor current, and output of the supply drive according to section 5. coincide with the required values. When checking the voltage of the motor circuit make sure that the 1 , 6.3 Putting into operation at the L2, L3 phase sequence is clockwise operating site (rotary field test). Before putting the transformer into operation operational tests according to section 6.1 have to be performed. 6.1.1 Check of step-by-step operation For this purpose operate push-button S1 (or S2 resp.). Keep the push- button pressed until the motor stops. Make sure that the driving motor is automatically switched off when the tap changer has performed one switching operation. 6.1.2 Functional check of the mechanical end position limit Operate to the penultimate position and operate the drive manually to end position. If operation of hand drive is continued the transmission gear will 17 8. SPECIAL DESIGNS X5.1 In order to meet certain service requirements the standard design of S38 the motor drive unit may be altered as p Q follows: A N J 8.1 Driving motor 3-ph. driving motor with rated power 1.5 kW DC driving motor 0.75 k W or 2.2 KW (2.2 kW with MA 7/8 2% % % g-—==0, housing only) Driving motor for single-phase alternating current, 1.1 kW (with MA 7/8 housing only) 2 2 R]213]S 28] njuninivinini. Nv 8.2 Other rated voltages for motor, control, and auxiliary circuits XS J112]3|4]5|6—0__1&|15 8.3 D C control circuit u |00}10 [20 301—_———a i o 8.4 Hand lamp (with tubular bulb, Fig. 1 5 Contact range for decadic lamp panel 220 V, 25 W, socket E-14) controlled via door contact X5.1 8.5 Plug socket, mounted o n the instrument panel 8.6 Built-in automatic fuses for control and auxiliary circuits 8.7 Increased heater power for operation in arctic areas. The basic heating (30 W) remains, whereas the heater power controlled by thermostat is doubled. MA7 : 200W MA7/8: 300W wa] S 3 8 —1 538 8.8 Heater controlled by hygrostat (with same heater rating as standard design) 8.9 Drag rings Fig. 1 6 NC contact range 18  8.10 Device for automatically running d) Intermediate gear with mounting through one or several operat- facility for a selsyn transmitter ing positions (automatic pas- (type and angle per step should sage of positions). In the auto- be indicated in the order sheet) matic passage of positions the step-by-step operation (see section 4.2.1) is cancelled by 8.12 Additional end position a mechanically operated NO signalling contacts contact which is mounted on (1 NO and/or1 NC contact the position transmitter plate. for each end position) 8.11 Special designs of the position 8.13 Additional c a m switches transmitter The motor drive unit may be a) Contact range for decadic lamp supplied with a maximum of 1 0 panel (decadic transmitter), additional cam switches, fig. 1 5 Honeywell, type BZ-2 RW822- A2 (NO or NC contacts). b) NC contact range (contact opens in The operation angle is the service position), fig. 1 6 adjustable. ¢) Additional contact range for remote position indication The standard design of the motor drive 8.14 Housing to be locked with a unit is provided with a potentiometer padiock contact range for remote position indi- cation by pointer instrument or with a contact range for lamp panel (see 8.15 Special design MA 7/8 appendix, circuit diagrams 00 885 TM (enlarged housing according to and 00 525 TM). appendix, drawing 895 661) Moreover, the following contact ranges (closing in the operating position) may 8.16 Other special designs, e.g. time be installed, depending on the number delay relay, auxiliary contactor, of operating positions: change-over switch for parallel operation, additional control switches, stranded wiring, Operating Contact additional and special terminals, positions ranges staggered transmission gear, may be supplied on request u p t o 19 4 against extra charge. up to 2 7 3 « u p t o 35 2 i) APPENDIX Circuit diagram....ccccvnreerecieninreesinenivenrrsssssesssssrssssssessesersssssssssnses 31331 TSR Position transmitter for lamp panel..........cceereererecernrercneesieerssceennnas 00525 TM Position transmitter for pointer instrument.............cccevcenenenene rerannarenns 00885 TM MA 7 protective housing, dimension drawing 895 660........ceccoureerecrersmenarcceennsens MA 7/8 protective housing, dimension drawing.........cccccccoveeceercccrerenenceens 895 661 Transmission gear, parts designation 890 661.........ccceccvecrerriecnerisererrernessecsmeanne Control gear, parts designation 890 660........cc.cccccvvrinmrrsirnrnicnrssseeressemsessseesseenss 19  x Oru w w £8 aw 3 MEY Tew o Y fiom a i g h t Gy i wv io 0" Ton 4 a w ohn e w g h m e Cll "RY Ay Ion RICKY: aN oN wv) Eo]C v o u v ¥ ne os us o is ™ TWNIWHIL ax : > NEI ZT ZC Z[CTETE. 111 | 1 |x 31331 TSR WOOH TOULNOD ,440 +8. 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[~ 3I 1 : ors {1-41 MIR R ToT : i r—0 I. LJ —o +p 0 J J! 1 4 [-1} 84] Sb 22, ke. ve gZge &2 €2, EO EY [3 E) “ "l i 2 bX ’ | | | NTT | UN A SS ER |! || iEe 6S ee -ah rs ies d ES: —— 1 —— —eww] — pUSO— Ea [& 3d —A— —t— 20  ? Xs 1 i 4 9 | \ / N -~ - -r ’ X5 0.2 0.3 24v 220v x02 ~~ Fa 1 1 =" ror.2 3 1 r | Los 3VOVA 220V-a v lo [o) os 20V~ MOV- 24V- ® ———— ® Fos NOVA 6OV- 12V- [ou 0 0 0 é Pe | for lamp panel for pointer instrument (00 525 TM) (00 885 TM) M A CHINENEADRIK Motor drive unit M A 7 00525 T M Position transmitter 00885 TM 21  450 : I FPROVIDED WITH GUARD EARTHING v8 | PLATE (SPECIAL DESIGN) SCREW M12 maine fa JEN # 3 : ¢ 0 - [ Pp 527 | § SEF en SDD) § 4 b § Bs A - = 2J — 3 BLIND GLAND PLATES 497 a J | oT 1 1 + HINGE