ETC SR12D Installation Manual page 25

Sensor Delta Dimming Installation Guide
Checking rack installation before installing dimmer modules
It is a good idea to go over the installation before installing rack modules.
Warning! – Power must be turned OFF when you perform this procedure.
1. Clean out dust, metal scraps or other debris from the rack interior.
Note: ETC recommends vacuuming the rack interior before installing
modules.
2. Check for loose connections, bare wires or damaged insulation.
3. Spin the top cooling fan to be sure it is not obstructed. Correct air leaks
caused by conduit openings, empty screw holes or misaligned panels.
Checking main power wiring
1. Check resistance between phases and ground for short circuits:
Phase to phase; resistance should be 10MΩ or higher
Phases to ground; resistance should be 10MΩ or higher
Checking load wiring
1. Check resistance between the load terminal input and output phases:
Above 1MΩ – Normal when no load is connected
Between 1 – 1000Ω – Normal when loads are connected
Below 1Ω – Indicates a dead short in the load wiring
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