Rail Lift Belt Failure - GE Giraffe OmniBed Service Manual

The following chart shows the control signal values and the output voltages for each of the motor conditions.
Control Signals, Relay Board
J37 pin 23
Switch
24V SELECT
Raise
0
canopy
Lower
1
canopy
Raise
0
E-base
Lower
0
E-base
None NA

4.6.10 Rail Lift Belt Failure

The following symptoms might be observed that indicate possible rail lift belt (drive belt) failure (rail belts that
have broken rungs after extended use):
• Canopy rises slowly and sticks just when doors are opening (4-6 inches from top of canopy travel)
• Heater doors don't open fully (lift hasn't traveled far enough to complete door opening mechanism)
• "In transition" alarm sounds when:
• Canopy is not all the way up to activate microswitches, OR
• Heater doors aren't fully open to activate their microswitches
If these symptoms exist, check for rail lift belt failure by doing the following:
1. Remove the canopy motor.
2. Slide up the decorative strip to expose the endcap screw. Remove the lower endcap.
3. Using a bright flashlight pointing up in the bottom of the rail, look inside the rail assembly through the
shipping lock-down screw slot near bottom of the rail. Look toward the back (North) to observe rail lift belt.
4. Manually raise and lower the canopy, slowly. (If possible, have a second person do this for you.) While
the canopy is being slowly raised and lowered, visually inspect the belt (via the screw slot) to determine
whether there are any rungs on the belt that are stripped/broken.
5. Inspect the entire belt by manually sending the canopy through its full cycle, especially the links as the belt
nears the top of upward travel.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
J37 pin 26 J37 pin 24
E/H ACTIVATE NVERTPOLARITY
0 1
0 0
0 1
0 0
1 NA
Chapter 4: Troubleshooting
E-base
J37 pin 27
J45-1
E/H SELECT
1 NA
1 NA
0 +24V
0 Gnd
NA NA
6600-0343-000 104
Canopy
J45-2 J46-1 J46-3
NA +24V Gnd
NA Gnd +12V
Gnd NA NA
+24V NA NA
NA NA NA
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