Trouble Shooting; Control Interface Test Points - GE prolec VR-1 Installation, Operation And Maintenance Manual

6. TROUBLE SHOOTING

6.1 Control Interface Test Points

Besides the general precautions to be taken when troubleshooting electrical apparatus, there are also the following
precautions which are particular to the static control.
Warning:
1. TROUBLESHOOTING entails working with energized equipment, caution should be taken to avoid personal shock.
2. Discharge capacitors by short circuiting terminals or leads before reconnecting any circuit.
3. Before disconnecting any plug connection in the control panel, de-energize the control by opening the PT disconnect
switch and closing the CT shorting switch located in the bottom left corner of the control box.
4. High Voltage—Current transformer circuitry. Do not disconnect the connectors inside this control cabinet cover unless
the voltage regulator is de-energized.
5. If an external power supply is used for testing the control, remove this power supply before switching to internal power
supply.
6. Short-circuit the current transformer secondary's. If left open-circuited, current transformers develop secondary
voltages hazardous to personnel.
7. Do not remove the indicator dial before de-energizing the voltage regulator.
Within the chart, when necessary, these warnings are repeated to further emphasize their significance.
prolec.energy/prolecge
GEH-7299A: Installation, Operation and Maintenance Manual
for Type VR1™ Single-Phase, Step Type Regulators
28