ETC Unison DRd Dimming Engine Replacement User Manual

ETC® Setup Guide

Step 3

Step 6a

Step 6b

Step 6c

The rack door has been
removed from this graphic
for clarity of this procedure.

Unison® DRd Dimming Engine Replacement

Overview

This guide outlines the procedure for removing and replacing the Unison® DRd dimming engine. For
more information on installing the Unison DRd, please refer to the Unison DRd Rack Enclosure
Installation Manual that shipped with your rack or you may download it from our website at

www.etcconnect.com

.

WARNING:

Before removing the Dimming Engine, de-energize main feed to the 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.

Remove the DRd Dimming Engine

CAUTION:

Before installing the new dimming engine, verify the voltage of the installed unit
matches the voltage of the replacement (labeled on the front panels). If the two are
different, do not install the replacement. Installing an incorrect voltage dimming
engine can result in equipment failure. Contact your authorized dealer or ETC
Technical Services for further assistance.

Step 1: Turn off power to the enclosure and follow appropriate safety procedures.
Step 2: Remove the top dimmer module from the enclosure.

Step 3: Loosen the two captured screws that secure the dimming engine panel.
Step 4: Gently pull the panel straight down until the top of the dimming engine panel is clear of the

Step 5: Tilt the dimming engine away from the rack enclosure.
Step 6: Disconnect the three cables that are attached to the unit:

Step 7: Remove the dimming engine:

enclosure.

a: For the cable bundle on the left side, squeeze the tabs on either side of the connector and

gently pull the cable until it is free from the unit.

b: For the ribbon cable connected on the right rear side, release the tabs on either side of the

connector by sliding them opposite the connector then gently pull the cable free.

c: For the 2-wire harness cable on the right side, gently pull the connector straight out.

a: Align the panel perpendicular to the rack.
b: Slide the panel up approximately one inch to align the guide pins with the top of the guide

slots.

c: Pull the panel straight out.

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Service:
Web:
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Via Pieve Torina, 48, 00156 Rome, Italy  Tel [phone]  Fax [phone]

(Americas) [e-mail] 

www.etcconnect.com 

 Rev B  Released 2012-02 ETC intends this document to be provided in its entirety.

 3031 Pleasant View Road, P.O. Box 620979, Middleton, Wisconsin 53562-0979 USA  Tel [phone]  Fax [phone]

 Ohmstrasse 3, 83607 Holzkirchen, Germany  Tel [phone]  Fax [phone]

Copyright © 2012 ETC. All Rights Reserved.  Product information and specifications subject to change.

(UK) [e-mail]  (DE) [e-mail] 

(Asia) [e-mail]

DRd Dimming Engine Setup Guide Page 1 of 3 Electronic Theatre Controls, Inc.

ETC Setup Guide

Step 5

Step 2a

Step 2b

Step 2c

The rack door has been
removed from this graphic
for clarity of this procedure.

semi-recessed

DRd installation

standard DRd

installation

• For a semi-recessed DRd installation, set the switch to the position
that is away from the 2-wire harness.

• For a standard DRd installation, set the switch closest to the 2-wire
harness.

Replacing the DRd Dimming Engine

Step 1: Replace the dimming engine.

a: Align the panel perpendicular to the enclosure.
b: Align the guide pins into the top of the guide slots.
c: Slide the panel down the guided slots.

Step 2: Reconnect the three cables to the panel:

a: For the cable bundle on the left side, push the cable into the connector. The black wire will

be closest to you and the blue will be farthest away. The first and sixth pins are flat on one
side to prevent the cable from being connected the wrong way.

b: For the ribbon cable on the right rear side, gently push the cable into the connector. The

tabs on the sides of the connector will close when the cable is properly connected. The
ribbon cable has a small tab to prevent it from being connected the wrong way. The tab will
be toward the rear of the enclosure.

c: For the two-wire cable on the right side, gently push the connector straight down. The black

wire will be toward the right side of the rack, and the red will be toward the left.

d: A fan speed switch is located above the 2-wire harness (fan harness) on the dimming

engine. Ensure that the switch is in the correct position for the installation type.

DRd Dimming Engine Replacement

Step 3: Tilt the dimming engine toward the rack enclosure.
Step 4: Gently push the dimming engine up.
Step 5: Tighten the two captured screws to secure the panel to the rack.
Step 6: Replace the first dimmer module.
Step 7: Reapply power to the enclosure.

DRd Dimming Engine Setup Guide Page 2 of 3 Electronic Theatre Controls, Inc.