ETC CEM3 v1.5.1 - Manual (Page 49)

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Common Tasks 43
Step 5: Slide the top of the filter up into the slot at the top of the door until the base clears
the metal retaining lip at the bottom.
Step 6: Ease the filter back into the door frame and carefully let it drop back into place.
Vacuuming Dimmer Modules
As with cleaning the air filters, you should inspect the dimmer module air vents and SCR
power cube inlets every six months and clean if necessary, more often if your system
operates in a dusty environment.
To vacuum the dimmer module air inlets:
Step 1: Open the rack door and inspect the air vents on the CEM3 and the air vents and
SCR power cube air inlets on the dimmer modules for any collection of dust or
other debris.
Step 2: If necessary, use a vacuum cleaner and nozzle to remove any visible dust or
other accumulated matter from the front of the modules without removing them
from the rack. Most dust collects on the dimmer choke vents and SCR power
cube air inlets of the modules (shown below).
Step 3: Close the rack door when you are finished vacuuming.
N o t e : For Sensor3 48-module racks, install the bottom filter first. The top filter rests on
the top edge of the bottom filter.
W A R N I N G : To avoid the possibility of electric shock, power must be turned OFF when
you perform this procedure. Before vacuuming dimmer or control modules
de-energize main feed to dimmer rack.and follow appropriate Lockout/
Tagout procedures as described in NFPA Standard 70E. It is important to
note that electrical equipment such as dimmer racks can present an arc
flash safety hazard if improperly serviced. This is due to available large
short circuit currents on the feeders of the equipment. Any work on
energized equipment must comply with OSHA Electrical Safe Working
Practices.
Do not remove dimmer modules when vacuuming. Phase voltages inside
the rack can be deadly, therefore only qualified technicians should be
allowed to remove modules and expose the inside of the dimmer rack.
C A U T I O N : Be careful not to push any foreign matter into the module.
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Dimmer choke vent SCR air inlet