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Sensor Delta operation and service notes
8
This section details changes to Sensor Dimming system operation and service
procedures necessary to function in a Delta power environment. Except for
the changes noted in this section, the Sensor CEM Dimming System User
Manual contains all necessary information to operate and service your system.
Auxiliary bay components
Every Sensor Delta Dimming system installation rack includes an attached
Auxiliary Bay. This bay provides the extra space needed to enclose the two-
pole branch circuit breaker array, main power disconnect switches, and load
circuit connection terminals used by Sensor Delta systems.
Using the branch circuit breaker array
Because delta power systems apply phase voltages on both the output and
return wires of a circuit, you must always turn off load circuit power at the
branch circuit breaker before performing any load circuit maintenance. Setting
the output level of a circuit to zero will not remove all voltage.
Warning! Branch circuit breakers in the Auxiliary bay must be shut off
1. Locate the circuit breaker for the load circuit you wish to turn off.
2. Put the circuit breaker switch in the Off position.
Main power disconnect switches
Split bus Sensor Delta systems include integrated 175 amp disconnect
switches for main power. A disconnect switch controls input and output phase
power for 12 dimmer slots. SR12D racks have one disconnect switch, SR24D
racks have two and SR48D racks contain four. Before performing maintenance
in the left-side Dimmer bay, turn all disconnect switches to Off .
Warning! Phase voltages will be present in the Dimmer bay unless all
1. Disconnect switches are turned Off when the handle end points right.
Phase power LEDs should also be off.
2. Disconnect switches are turned On when the handle end points down.
Phase power LEDs should also be on.
before servicing loads. Phase voltages are present in load
circuit wiring unless branch circuit breakers are turned Off.
Push the switch to the inside
to turn the dimmer Off
Push the switch to the outside
to turn the dimmer On
Phase power LEDs
Main power disconnect switch
(in the Off position)
Figure 3: Load circuit breakers and main power switch
Auxiliary bay disconnect switches are turned Off.
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Electronic Theatre Controls, Inc.
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