a-2000 User Guide
a-2000 Page 7
Dimmer Cabinets with Digital Controls
Revision G November 2006
Feed and Load Wiring
The entire right side of the dimmer cabinet is reserved for power wiring. The
cabinet includes:
• Knockouts for feeding in and out through the top, bottom, or right side of the
cabinet.
• Main lugs for phases A, B, and C (or A and B in the case of a single-phase
cabinet)
• A load terminal block.
• A multi-terminal neutral block.
• A single ground terminal
An optional multiple-terminal ground bus is available, part number OPT-A2GND-
KIT.
Unless limited by an optional main breaker, the main lugs are sized for every
dimmer to be loaded to maximum capacity. You may elect to size the feed to the
actual connected load on the cabinet.
Control Input Wiring
The upper left portion of the dimmer cabinet is reserved for control wiring.
Fluorescent Wiring
There are several types of fluorescent dimming ballasts. Check carefully for the
type of ballasts you are installing on this system.
Incorrect wiring of these ballasts to dimmers can damage the ballasts.
Turn On
Prior to turn on, verify the following is installed correctly:
• Main feed wiring
• Load wiring
• Control wiring
• Configuration of each module with the type of load connected and any ballast
control wiring
Bypass Switch - Non Universal 120V Units Only
The Bypass switch has two modes: Normal and Bypass. When the switches are
set to Bypass, all the dimmer electronics are removed from the circuit and line is
connected directly to load. Leviton normally ships the cabinet with all these
switches in the Bypass position and all circuit breakers in the Off position.
Bypass Shunts - Non Universal 277V Units Only
On 277V units, the bypass is accomplished via an optional constant module.
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