GU-D15 80173-110-02 G651885C 3H100904-044 | Gate Commutated Turn-Off Thyrister Unit

1. Isolate and lock out the drive system from any high voltage source.
Disconnect any incoming power sources, medium voltage sources
should be isolated and locked out and all control power sources should
be turned off at their respective circuit breaker(s).
Verify with a potential indicator that power sources have been
disconnected, and that the control power in the drive is de-energized.
2. Isolate the power circuit from system ground.
You must remove the grounds on the following components within the
drive (refer to the electrical diagrams provided with the equipment to
assist in determining the points to disconnect):
• Voltage sensing boards (VSB)
• Grounding network (GN)