ETC SR12D Installation Manual page 34

Facility power cables (white)
connected to top disconnect switch
Power feed bus cables (gray) to lower
disconnect switch
Figure 37: Factory-bussed
disconnect switches)
Sensor Delta rack
product label
Dimming Rack
(SR12D example)
Figure 38: Product label location
34
Input power connection options
Sensor Delta uses either a standard bus connection or multiple power feeds
with disconnect switches.
Standard bus racks have a single set of input power connections and no
internal disconnect switches.
Note: Standard bus installations require a main circuit breaker or other power
disconnect device to control power input.
Split bus racks have a 175 amp disconnect switch and power feeds for each
set of 12 dimmer slots, up to four per rack.
Note: If amp capacity is sufficient for dimmer loading, multiple disconnect
switches can be soft-bussed at the factory to use a single power feed.
Standard bus input power
Rack model
SR12D
SR24D
SR48D
Identifying rack type using the product label
Information on a Sensor rack's size, input voltage, and connection type is
printed on the product label inside the dimmer module bay. Rack model and
input voltage configuration is indicated by checkmarked boxes.
Rack size and input
power
DELTA DELTA
Dimmer Rack Model
SR48D
X
HSR48D 230VAC
Electronic Theatre Controls, Inc. Electronic Theatre Controls, Inc.
Middleton, WI Made in USA Middleton, WI Made in USA
US Patent number 5,352,958 US Patent number 5,352,958
Note: The example product label is from a SR48D rack. Smaller racks will
have fewer options in the Input Power column due to lower overall
amperage capacity.
Split bus input power
Power feed Component
1 at 200 amps SR12D
1 at 400 amps SR24D
1 at 800 amps SR48D
120VAC
Figure 39: A Sensor Delta Installation Rack product label
Power feed
1 at 175 amps
1–2 at 175 amps each
1–4 at 175 amps each
Rack connection
type
Input Power: Input Power:
3 phase, 3-wire, 50/60Hz, 3 phase, 3-wire, 50/60Hz,
Delta Delta
For use with ETC DELTA For use with ETC DELTA
dimmer modules only dimmer modules only
(Check the box that applies) (Check the box that applies)
1 X 160 Amp Max 1 X 160 Amp Max
2 X 160 Amp Max 2 X 160 Amp Max
3 X 160 Amp Max 3 X 160 Amp Max
X
4 X 160 Amp Max 4 X 160 Amp Max
1 X 800 Amp Max 1 X 800 Amp Max
10,000A RMS symmetrical @ 240VAC 10,000A RMS symmetrical @ 240VAC
Electronic Theatre Controls, Inc.