54
Unison
®
DRd Rack Enclosure Installation Manual
Step 6:
Power up the rack.
Before installing or removing dimmer or control modules for
service, 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.
Step 7:
Switch all module circuit breakers to the “On” position.
Step 8:
Reference the related Architectural Control Processor Programming Guide for
rack configuration setup and operation.
Control Bypass (Test Mode)
Test load circuits connected to the DRd rack enclosure by switching the “Control Bypass”
switch to the “Test” position. The Control Bypass switch allows testing of lighting loads and
provides temporary lighting before complete system commissioning. Return the switch to
its “Normal” setting after the test is complete.
W A R N I N G :
Never power up or operate the Unison DRd rack without all modules
installed. Failure to comply exposes you to dangerously high voltages that
may result in death by electrical shock.
N o t e :
Store this access panel in a safe place until you are finished roughing in conduit
and terminations. You will need to reinstall this panel when then rack enclosure is
installed and all wires have been terminated.
C A U T I O N :
Turning the Control Bypass switch to the “Test” position with all module circuit
breakers “On” will bring all lighting loads to full. To select only certain lighting loads
for test, switch “Off” undesired module circuit breakers in the DRd rack enclosure.
Control Bypass switch
