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Questions and Answers
Which component of the control gear is responsible for mechanically operating the cam switches?
Which component of the control gear is responsible for mechanically operating the cam switches?
What is the primary function of the tap change indication wheel in the control gear?
What is the primary function of the tap change indication wheel in the control gear?
Which element listed is not part of the control gear according to the provided information?
Which element listed is not part of the control gear according to the provided information?
Which component acts as an indicator for the position within the control gear assembly?
Which component acts as an indicator for the position within the control gear assembly?
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In the context of the control gear, which component is likely used for safety during operation?
In the context of the control gear, which component is likely used for safety during operation?
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What is the rated torque on the drive shaft for the maximum capacity model?
What is the rated torque on the drive shaft for the maximum capacity model?
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What is the operating voltage for control and heater systems?
What is the operating voltage for control and heater systems?
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What is the frequency at which the drive operates?
What is the frequency at which the drive operates?
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What is the maximum number of operating positions for the device?
What is the maximum number of operating positions for the device?
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What is the weight of the MA 7/8 model?
What is the weight of the MA 7/8 model?
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What is the power consumption of the control circuit during running time?
What is the power consumption of the control circuit during running time?
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What is the synchronous speed of the drive?
What is the synchronous speed of the drive?
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What type of gear system is described as maintenance-free and relies on a flanged-on motor?
What type of gear system is described as maintenance-free and relies on a flanged-on motor?
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Which component of the system has a test voltage to ground of 2.5 kV?
Which component of the system has a test voltage to ground of 2.5 kV?
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Which safety feature prevents false phase sequence in the equipment described?
Which safety feature prevents false phase sequence in the equipment described?
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What indicates the current operational step of the mechanical equipment?
What indicates the current operational step of the mechanical equipment?
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What is the purpose of the hand crank in the mechanical equipment?
What is the purpose of the hand crank in the mechanical equipment?
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What materials are used for the housing of the described equipment?
What materials are used for the housing of the described equipment?
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How is local control achieved in this mechanical system?
How is local control achieved in this mechanical system?
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What provides the indication of a tap-change in progress in the equipment?
What provides the indication of a tap-change in progress in the equipment?
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What type of coating is applied to the housing after being finished with a primer?
What type of coating is applied to the housing after being finished with a primer?
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What is the purpose of resistor R2 in the heater circuit?
What is the purpose of resistor R2 in the heater circuit?
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What happens when the push-button S1 is operated in the control circuit?
What happens when the push-button S1 is operated in the control circuit?
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Which terminal connection is responsible for interrupting the control voltage when the motor protective switch Q1 is operated?
Which terminal connection is responsible for interrupting the control voltage when the motor protective switch Q1 is operated?
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What is the role of the motor protective switch Q1 in the circuit?
What is the role of the motor protective switch Q1 in the circuit?
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How does the control circuit ensure that control operations are irreversible?
How does the control circuit ensure that control operations are irreversible?
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What specific action does the push-button S5 perform?
What specific action does the push-button S5 perform?
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What is indicated by terminals 8 and 9 in the heater circuit?
What is indicated by terminals 8 and 9 in the heater circuit?
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What function does the safety circuit serve in the control context?
What function does the safety circuit serve in the control context?
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What is the most significant feature presented in the confusing layout?
What is the most significant feature presented in the confusing layout?
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Which interpretation best represents the scattered elements in the content?
Which interpretation best represents the scattered elements in the content?
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What could the presence of 'J' and 'LJ' indicate in this context?
What could the presence of 'J' and 'LJ' indicate in this context?
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What do the brackets and symbols imply about the information structure?
What do the brackets and symbols imply about the information structure?
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How does the layout impact the readability of the information?
How does the layout impact the readability of the information?
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What does the random assortment of numbers and letters suggest about the data?
What does the random assortment of numbers and letters suggest about the data?
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What might the 'E' represent in this context?
What might the 'E' represent in this context?
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What effect does the use of multiple languages or symbols play in this layout?
What effect does the use of multiple languages or symbols play in this layout?
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What does the term 'A' signify in the fragmented style of the content?
What does the term 'A' signify in the fragmented style of the content?
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What is likely the challenge faced by the reader when engaging with this material?
What is likely the challenge faced by the reader when engaging with this material?
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The maximum number of operating positions for the device is 70.
The maximum number of operating positions for the device is 70.
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The weight of the MA 7 model is approximately 90 kg.
The weight of the MA 7 model is approximately 90 kg.
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The heater power controlled by thermostat MA 7: 100 W is less than that of MA 7/8: 150 W.
The heater power controlled by thermostat MA 7: 100 W is less than that of MA 7/8: 150 W.
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The rated torque on the drive shaft for the maximum capacity model is 35 Nm.
The rated torque on the drive shaft for the maximum capacity model is 35 Nm.
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The synchronous speed of the drive is 1500 revolutions per minute.
The synchronous speed of the drive is 1500 revolutions per minute.
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The test voltage to ground without the motor is 2.5 kV for 1 minute.
The test voltage to ground without the motor is 2.5 kV for 1 minute.
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The power consumption of the control circuit when energized is 52 VA.
The power consumption of the control circuit when energized is 52 VA.
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The rated current values mentioned include 35/20A.
The rated current values mentioned include 35/20A.
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The rated power of a 3-phase driving motor is 2.2 kW when located with MA 7/8 housing.
The rated power of a 3-phase driving motor is 2.2 kW when located with MA 7/8 housing.
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The voltage checking process for the motor circuit must ensure that the L1, L2, L3 phase sequence is counterclockwise.
The voltage checking process for the motor circuit must ensure that the L1, L2, L3 phase sequence is counterclockwise.
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DC driving motors can have a rated power of either 0.75 kW or 2.2 kW based on housing specifications.
DC driving motors can have a rated power of either 0.75 kW or 2.2 kW based on housing specifications.
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The operational tests required before putting a transformer into service are specified in section 6.3.
The operational tests required before putting a transformer into service are specified in section 6.3.
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The driving motor is automatically switched off when the tap changer completes two switching operations.
The driving motor is automatically switched off when the tap changer completes two switching operations.
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A single-phase alternating current driving motor has a rated power of 1.5 kW.
A single-phase alternating current driving motor has a rated power of 1.5 kW.
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Mechanical end position limits can be checked by manually operating to the penultimate position.
Mechanical end position limits can be checked by manually operating to the penultimate position.
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The symbol 'g-—==0,' appears to have significance in the context of the motor drive unit design.
The symbol 'g-—==0,' appears to have significance in the context of the motor drive unit design.
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The heater resistor R1 is switched on via thermostat Bi.
The heater resistor R1 is switched on via thermostat Bi.
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The control circuit is connected to L2, N via terminals 12 and 13.
The control circuit is connected to L2, N via terminals 12 and 13.
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The motor protective switch Q1 has an open-circuit trip mechanism.
The motor protective switch Q1 has an open-circuit trip mechanism.
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The operation process described follows a continuous cycle without any interrupting steps.
The operation process described follows a continuous cycle without any interrupting steps.
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Push-button S1 is used to energize the K2 contactor in the motor control circuit.
Push-button S1 is used to energize the K2 contactor in the motor control circuit.
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The intricate layout of the circuit facilitates clear understanding of the operational steps.
The intricate layout of the circuit facilitates clear understanding of the operational steps.
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Resistors in the service positions are installed between n-1 step position contacts.
Resistors in the service positions are installed between n-1 step position contacts.
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Terminals 21-22 are responsible for energizing the motor protective switch Q1.
Terminals 21-22 are responsible for energizing the motor protective switch Q1.
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The correction value for the tap changer operation is calculated as $1/2(7 ext{ sections} - 1.5 ext{ sections})$.
The correction value for the tap changer operation is calculated as $1/2(7 ext{ sections} - 1.5 ext{ sections})$.
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When the tap changer is in operating position 10, the diverter switch operation results in 5 sections.
When the tap changer is in operating position 10, the diverter switch operation results in 5 sections.
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The total number of sections counted during the diverter switch operation in position 11 is identical to that in position 10.
The total number of sections counted during the diverter switch operation in position 11 is identical to that in position 10.
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To couple again, the crank must be turned towards position 12 after uncoupling the vertical drive shaft.
To couple again, the crank must be turned towards position 12 after uncoupling the vertical drive shaft.
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The result of the diverter switch action in the final operation is 6 sections.
The result of the diverter switch action in the final operation is 6 sections.
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The tap changer operation requires a complete turn of the crank for all positions.
The tap changer operation requires a complete turn of the crank for all positions.
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The red center mark appearing signifies the completion of the diverter switch operation.
The red center mark appearing signifies the completion of the diverter switch operation.
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Position 10 requires the crank to be turned towards position 9 to achieve diverter switch operation.
Position 10 requires the crank to be turned towards position 9 to achieve diverter switch operation.
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The gear system includes a maintenance-free belt gear designed for high noise operation.
The gear system includes a maintenance-free belt gear designed for high noise operation.
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The surfaces between the cover and tank are protected by a ledge and sealed solely with silicone.
The surfaces between the cover and tank are protected by a ledge and sealed solely with silicone.
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There are four labyrinth apertures in the rear side of the tank for airing the housing.
There are four labyrinth apertures in the rear side of the tank for airing the housing.
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The Poly-V-belt used in the transmission element is made of natural rubber.
The Poly-V-belt used in the transmission element is made of natural rubber.
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The drive shaft apertures are sealed to protect against dust but not against jets of water.
The drive shaft apertures are sealed to protect against dust but not against jets of water.
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The cover can be swung open in any direction as indicated in the order sheet.
The cover can be swung open in any direction as indicated in the order sheet.
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The bottom of the tank consists of four plates for the cable entries.
The bottom of the tank consists of four plates for the cable entries.
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The transmission element can safely come into contact with lubricants as needed.
The transmission element can safely come into contact with lubricants as needed.
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Study Notes
Equipment Specifications
- Current ratings: 291.7A, 35/20A, 48/28A, 6.739 A
- Frequency: 50 Hz
- Synchronous speed: 1500 revolutions per minute (1/min)
- Rated torque on drive shaft: 13 Nm, 18 Nm, 26 Nm, 35 Nm
- Maximum number of operating positions: 35 (options for 70 or 105)
Electrical Specifications
- Voltage for control and heater: 220 V single phase
- Power consumption of control circuit: 52 VA when energized, 24 VA during running time
- Heater power output: 30 W, with variations for MA 7 (100 W) and MA 7/8 (150 W)
- Test voltage without motor: 2.5 kV RMS for 1 minute
Mechanical Design
- Housing made of corrosion-proof light-metal casting, consists of two parts: tank and cover
- Finished with primer and top coat (RAL 7033)
- Gearing is a Poly-V-belt gear, maintenance-free with mechanical end position limit
- Control gear mounted to transmission gear, includes a cam disc for mechanical operations
Safety Features
- Motor protective switch includes emergency-off push-button and automatic restart feature
- Electrical and mechanical end position limits for added safety
- Safety circuit prevents false phase sequences
Monitoring and Control
- Lamp indicates motor protective switch tripping
- Mechanical six-figure operation counter for monitoring usage
- Position indication provided by a mechanical position indicator
Hand Crank
- Hand crank available for emergency service and adjustment purposes
Operation
- Control follows a step-by-step principle; engages via push buttons in motor unit or control room
- Operations are automatically completed without interruption after energization
- Includes safety measures to block further energization and protect against equipment failures
Circuit Checks
- Voltage, current, and output must align with required values during checks.
- Ensure L1, L2, L3 phase sequence is clockwise for rotary field tests.
Motor Drive Installation
- Follow section 5 for reinstalling the motor drive.
- Conduct operational tests as per section 6.1 before powering up the transformer.
Step-by-Step Operation Test
- Press and hold push-button S1 (or S2) until the motor stops.
- Ensure the motor automatically switches off after one switching operation by the tap changer.
Functional Checks
- Verify the mechanical end position limit by operating to near final position and manually driving to the end.
- If manual operation continues past the limit, avoid damage to the gear mechanism.
Motor Design Variations
- Standard motor drive may be modified for specific service requirements.
- Options include:
- 3-phase motor rated at 1.5 kW.
- DC motors rated at either 0.75 kW or 2.2 kW.
- Single-phase motors rated at 1.1 kW.
Key Motor Specifications
- Current ratings per motor type:
- Various currents based on power types (e.g., 291.7 A, 35/20 A, etc.).
- Operating frequency is fixed at 50 Hz.
- Synchronous speed: 1500 rpm.
- Rated torque on drive shaft ranges from 13 Nm to 35 Nm.
- Maximum positions: 35 (extendable to 70 or 105).
Control and Heater Voltages
- Control and heater voltage at 220 V (1-phase).
- Control power consumption: 52 VA when energized, 24 VA during operation.
- Heater consumes a constant 30W, with larger capacities for specific models.
Housing Specifications
- Light-metal cast cabinet with IP 54 protection, suitable for outdoor use.
- Sealed against water jets with labyrinth apertures for ventilation.
- Easy access via a swing-open cover.
Gear Specifications
- Gear consists of maintenance-free transmission gear and control gear.
- Transmitting elements are made of wear-resistant synthetic Poly-V belts.
- Must avoid contact with lubricants to prevent failures.
Heater and Control Circuits
- Heater circuit is continuously connected; regulated by a thermostat for resistance types.
- Control circuit interrupts when motor protective switches are activated.
Operation Details
- Control operates on a step-by-step principle, ensuring irreversible switching.
- Push-button control integrates safety circuits to prevent accidental operation.
Tap Changer Operations
- Specific steps involve turning the crank to achieve desired switch positions and measuring sections moved.
- Corrections to be noted based on actual vs. desired operations, optimizing tap functioning as needed.
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Description
Test your knowledge on the specifications of electrical equipment including current ratings, voltage requirements, and safety features. This quiz covers various parameters such as power consumption, mechanical design, and operational capacities. Deepen your understanding of how these specifications impact performance and safety.
