Instruction manual

P84905-001 G
Sheet 21 of 37
Trouble Condition Priority Identification
When multiple troubles exist the Control PC board Coded Trouble LED Indicators indicate the highest priority trouble.
Table 6 shows the priority sequence. When the highest priority is repaired, the next highest priority will automatically be
displayed. Table 6 lists the coded condition of these 5 LED indicators and the action required.
Table 6: Control PC Board Trouble Priority Identification
Location Priority Location Displayed Priority
1. NAC 1
2. NAC 2
3. NAC 3
4. NAC 4
5. AUX
6. CC1
7. CC2
8. SYNC BUS
1. CURRENT LIMIT
2. SHORT
3. OPEN
4. GROUND FAULT
Table 7: Control PC Board Coded Trouble Identification
Coded Trouble LED’s
Trouble
Locator
Trouble
Condition
Action
“□” = OFF, “■” = ON
D8 D7 D6 D5 D4 D3
□ □ □ □ □ □
No Fault No Fault No Action Required.
□ □ □ □ □ ■
Ground Fault Ground Fault
Shut off AC Mains Power to unit.
Open cabinet door. Press and hold SW5, Ground Fault Locator
Switch for 5 seconds. Release switch.
□ □ □ □ ■ □
NAC Output 1 Short
Check for a wiring short. Check for a shorted or improperly
wired NAC Appliance. (If an appliance is wired + to – and – to +
a short trouble will be indicated.
□ □ □ ■ □ □
NAC Output 1 Open
Check OUT1 terminals for good connections. Check NAC
circuit wiring for continuity. Check NAC circuit for 10K Ohm
EOLR.
□ □ □ ■ ■ □
NAC Output 1 Current Limit Reduce the number of NAC Appliances on Output1.
□ □ ■ □ □ □
NAC Output 2 Short
Check for a wiring short. Check for a shorted or improperly
wired NAC Appliance. (If an appliance is wired + to – and – to +
a short trouble will be indicated.
□ □ ■ □ ■ □
NAC Output 2 Open
Check OUT2 terminals for good connections. Check NAC circuit
wiring for continuity. Check NAC circuit for 10K Ohm EOLR.
□ □ ■ ■ □ □
NAC Output 2 Current Limit Reduce the number of NAC Appliances on Output1.
□ □ ■ ■ ■ □
NAC Output 3 Short
Check for a wiring short. Check for a shorted or improperly
wired NAC Appliance. (If an appliance is wired + to – and – to +
a short trouble will be indicated.
□ ■ □ □ □ □
NAC Output 3 Open
Check OUT3 terminals for good connections. Check NAC
circuit wiring for continuity. Check NAC circuit for 10K Ohm
EOLR.
□ ■ □ □ ■ □
NAC Output 3 Current Limit Reduce the number of NAC Appliances on Output1.
□ ■ □ ■ □ □
NAC Output 4 Short
Check for a wiring short. Check for a shorted or improperly
wired NAC Appliance. (If an appliance is wired + to – and – to +
a short trouble will be indicated.
□ ■ □ ■ ■ □
NAC Output 4 Open
Check OUT4terminals for good connections. Check NAC circuit
wiring for continuity. Check NAC circuit for 10K Ohm EOLR.
□ ■ ■ □ □ □
NAC Output 4 Current Limit Reduce the number of NAC Appliances on Output1.