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28.5 VDC Ground Power Unit
Models:
11A6647-1000/1010
11B6647-1000/1010
11C6647-1000/1010
11D6647-1000/1010
11A6647C1000/1010
11B6647C1000/1010
11C6647C1000/1010
11D6647C1000/1010
11A6655-1000/1020
11B6655-1000/1020
11C6655-1000/1020
11A6655C1000/1020
11B6655C1000/1020
11C6655C1000/1020
11D6655C1000/1020
11A6665-1000/1010
11B6665-1000/1010
11C6665-1000/1010
11A6666-1000
11B6666-1000
11C6666-1000
12/2006 - Rev. 04
- 47 -
red flashing
green
red
green flashing
yellow flashing
yellow
off
6.0 TROUBLE SHOOTING (continued)
6.3
MONITORS & FAULT INDICATION
The following LED symbols are used to define the color/flashing status of the LED’s on the Control Panel:
Event numbers are prefixed with an
∗
are events which require acknowledging using the
“R” push button. Events prefixed with an E are events that do not require acknowledging.
Event Number
LED Status Test or Inspection
Corrective Action
*541
Mains Failure
1. Verify that the cabling hasn’t been
incorrectly installed, e.g. the
rotating field is not correct
2. If the mains voltage or frequency
exceeds the permissible
tolerances during operation, the
converter is switched off and the
LED’s light up as shown.
1. Rewire the input cables so that phasing is
correct.
2. Monitor input power to verify that it is
b/-10% of the nominal voltage
and b/-5% of the nominal
frequency. Correct any problems at the
source.
*547
Input Overload
Failure
1. Check the DC load of the unit
2. Check the internal components
like transformer, rectifier and
output filter capacitors
1. Lower the DC load to the unit
2. Exchange faulty components
*548
Q1 Failure -
Door open
1. Check the Q1 coil
2. Check the Q1 auxiliary contact
and wiring
3. Check front and back door limit
switches
1. Replace the coil if it is defective
2. Fix the wiring or replace the auxiliary
contact if needed
3. Close door, reposition or replace limit
switches
*552
Temperature
Failure
Transformer
1. Check for blocked air inlet
2. Verify that the unit has not been
operating in an overload condition
for an extended period of time.
1. Clean air inlets and all screens
2. Allow transformer to cool down and then
operate it with less load.
*555
Temperature
Failure Inlet Air
1. Check for blocked air inlet
2. Is the outside temperature above
104
°
F
1. Clean air inlets and all screens
2. Provide extra cooling to the unit or wait
until the temperature drops below 104
°
F
6.3 Monitors and fault indication continued on following page.
R