ETC SR12D Installation Manual page 27

Sensor Delta Dimming Installation Guide
Optional – Checking line voltages on the phase bus bars
You can check the voltages on your phase bus bars with a Digital Voltmeter
(DVM) before installing your modules.
Warning! – Line voltages are present on the phase bus bars during this
procedure. You must be a qualified electrician familiar with
the hazards of working with electricity and use extreme
caution to check line voltages on the phase bus bars.
Warning! – risk of electric shock
HIGH LEAKAGE CURRENT
Ground connection essential before connecting supply
Disconnect power before removing modules
Service by authorized persons only
1. Close the dimmer rack door.
2. Apply phase power at the main circuit breaker for 90 seconds. Observe
the rack for evidence of shorting, like arcing sounds or a burning smell. If
you detect evidence of shorting, shut off power and fix the wiring.
3. Open the rack door and check voltage between phases and ground:
120 volt systems
Phase to phase; voltage should be between 110 to 130VAC
Phases to ground; voltage should be 65 and 75VAC
230 volt systems
Phase to phase; voltage should be between 220 to 240VAC
Phases to ground; voltage should be 125 and140VAC
4. Turn off phase power at the main circuit breaker.
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