The retrofit, Preparation, Remove the old – ETC Sensor+ CE Rack (ESR+) CEM+ to CEM3 Retrofit User Manual

Page 7: N o t e

The Retrofit

S e c t i o n 2

The Retrofit

Preparation

Step 1:

Use Sensor Configuration Editor and a SLTA if you wish to download and save

the current Sensor configuration out of the racks for later reference. For

information on this process contact ETC Technical Services (see

page 1

Step 2:

Turn off main power to the rack(s). Before 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 3:

Remove the eight dimmer modules above the CEM (if retrofitting an SR48 rack,

remove the eight modules below the CEM as well). Note and document the

modules’ order/positioning in the rack for proper insertion and configuration later.

Step 4:

Use a digital voltmeter and VERIFY that power is off by checking voltages for

all combinations between the phase bars, neutral and ground.

Step 5:

Remove the CEM from the rack.

Remove the Old

Step 1:

Mark the edge connector of each dimmer output ribbon cable (1, 2, 3 & 4) as

illustrated below in the hexagons. There may be stickers on the ribbon cables

already, however these may refer to cable length and not dimmer outputs. They

should not be used as a reference for these instructions.

Step 2:

Document and/or label each wire that is currently landed on the J2 edge

connector.

Step 3:

Unscrew the dimmer output edge connectors from the backplane metal.

Step 4:

Carefully feed the dimmer output ribbon cables through the backplane.

Step 5:

Examine each ribbon cable for any nicks or cuts that may have resulted from

scraping against the backplane.

Step 6:

Unscrew the power edge connector (J1). Remove it from the backplane by

N o t e :

The order/layout of the dimmer output edge connectors is different on the CEM3

backplane.

1 2 3 4 5 6 7 8 9 10 11 12 13 14

CEM SR48 Ribbon Cable Layout

(1-24)

CEM SR6/12 Ribbon Cable Layout

(1-24)

(73-96)

(49-72)

(25-48)

(1-24)

CEM SR24 Ribbon Cable Layout