Technical data

TROUBLESHOOTING
CV ELECTRICAL POWER SYSTEM MAINTENANCE MANUAL 2A5A2-ELEC-MM-1-0 45
5.10 Device Related to Power Tray Doesn't Work
Procedure
1. Follow the troubleshooting steps in Figure 9.
0.
At the power tray measure voltage at terminal:
Negative Probe Positive Probe Acceptable Readings
Terminal 6 Terminal 3 120 ± 12 VAC
No
Voltage OK? No
Yes
Voltage OK? No
At the power tray measure voltage at terminal:
Negative Probe Positive Probe Acceptable Readings
Terminal 12 Terminal 9 120 ± 12 VAC
At the power tray measure voltage at terminals:
Yes
Voltage OK? No
Negative Probe Positive Probe Acceptable Readings
Terminal 25
Terminal 18
Terminal 18
Terminal 33
Terminal 33
Terminal 30
Terminal 21
Terminal 21
Terminal 37
Terminal 23 + 12 VDC
Terminal 17 + 5 VDC
Terminal 19
- 5 VDC
Terminal 31 + 12 VDC
Terminal 34 - 12 VDC
Terminal 28
+ 12 VDC
Terminal 20
+ 5 VDC
Terminal 22
- 5 VDC
Terminal 36
+ 12 VDC
Terminal 37 Terminal 38 -12 VDC
See Section 5.6, Unit Plugged
in UPS #1 Doesn’t Function
See Section 5.7, Unit Plugged
in UPS #2 Doesn’t Function
Replace defective power supply
(see Section 4.11, Replacing a
Power Tray Power Supply)
Replace fuses 2A5A2-F-EP03
and 2A5A2-F-EP04
Figure 9 Troubleshooting – Device Related to Power Tray Doesn't Work