Manual for VD4

Manual for VD4

Brand: ABB

Category: Power Supplies

Document Type: Manual

Language: EN

Uploaded: April 20, 2026, 7:54 p.m.

VD4 Circuit-Breaker Operation

Safety First!

  • Ensure the installation environment is suitable for electrical apparatus.
  • All installation, service, and maintenance must be performed by qualified personnel.
  • Strictly follow the instructions in this manual and adhere to safety regulations.
  • Do not exceed the rated performance of the apparatus during service.

Handling and Storage

  • Circuit-breakers are shipped in open position with springs discharged.
  • Check for damage upon receipt and notify ABB within five days if any irregularities are found.
  • Store in a dry, well-ventilated, non-corrosive ambient, away from flammable materials, between -5°C and +45°C.
  • Use special lifting tools and supports for handling. Avoid lifting directly under the apparatus.

Operation

  • Manual spring charging: Activate the lever until the yellow indicator appears.
  • Electrical spring charging: Achieved via geared motor, shunt closing release, or shunt opening release.
  • Closing: Press the closing pushbutton (5) with springs fully charged.
  • Opening: Press the opening pushbutton (4).

Maintenance

  • Regular inspections are crucial for trouble-free operation.
  • Servicing and repairs should be performed by trained personnel.
  • Refer to specific paragraphs for detailed procedures on inspection, servicing, and repairs.

Troubleshooting and error codes

ITEM INSPECTED PROCEDURE POSITIVE CHECK
1 Insulation resistance. Medium voltage circuit: With a 2500 V megger, measure the insulation resistance between the phases and the exposed conductive part of the circuit. The insulation resistance should be at least 50 Mohm and in any case constant over time.
2 Auxiliary circuits. Auxiliary circuits: With a 500 V megger (if the apparatus installed allows this), measure the insulation resistance between the auxiliary circuits and the exposed conductive part. Check that the connections to the control circuit are correct: proceed at the relative power supply. The insulation resistance should be a few Mohm and in any case constant over time. Operations and signals normal.
3 Manual operating mechanism. Carry out a few closing and opening operations (see chap. 6). N.B. Supply the undervoltage release and the locking magnet on the operating mechanism at the relative rated voltage (if provided). The operations and the relative signals take place normally.
4 Motor operator (if provided). Supply the spring charging geared motor at the relative rated voltage. The springs are charged normally. The signals are normal. With the springs charged, the geared motor stops.
5 Undervoltage release (if provided). Carry out a few closing and opening operations. N.B. Supply the undervoltage release and the locking magnet on the operating mechanism at the relative rated voltage (if provided). Supply the undervoltage release at the relative rated voltage and carry out the circuit-breaker closing operation. Cut off power to the release. The geared motor recharges the springs after each closing operation. The circuit-breaker closes normally. The signals are normal. The circuit-breaker opens. The signal changes over.
6 Shunt opening release and additional shunt opening release (if provided). Close the circuit-breaker and supply the shunt opening release at the relative rated voltage. The circuit-breaker opens normally. The signals are normal.
7 Shunt closing release (if provided). Open the circuit-breaker and supply the shunt closing release at the relative rated voltage. The circuit-breaker closes normally. The signals are normal.
8 Key lock (if provided). Open the circuit-breaker. Turn the key and remove it. Attempt the circuit-breaker closing operation. Put the key back in and turn it 90°. Carry out the closing operation. Neither manual or electrical closing takes place. Both electrical and manual closing take place normally; in this position the key cannot be removed.
9 Locking electromagnet (-RL1) (if provided). With the circuit-breaker open, springs charged and locking electromagnet not supplied, attempt circuit-breaker closing both manually and electrically. Closing is not possible.
10 Auxiliary contacts in the operating mechanism. Insert the auxiliary contacts in suitable signalling circuits. Carry out a few closing and opening operations. Signals take place normally.
11 Locking electromagnet on the truck (circuit-breaker -RL2) (if provided). With the circuit-breaker open, in the isolated for test position and the locking electromagnet not supplied, attempt racking-in of the circuit-breaker. Supply the locking electromagnet and carry out the racking-in operation. Racking-in is not possible. Racking-in takes place correctly.
12 Auxiliary transmitted contacts for signalling circuit-breaker racked-in, isolated (UniGear or UniSafe switchgear). Insert the auxiliary contacts in suitable signalling circuits. With the circuit-breaker racked into the enclosure, carry out a few traverse operations from the isolated for test position to the connected position. Take the circuit-breaker to the racked-out position. The signals due to the relative operations take place normally.
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