54 Troubleshooting
Table 16 – Diagnosing system faults
Fault symptom | Possible causes |
|
|
The AC ON LED is not | • No ac input voltage. |
lit. | • The input circuit breaker is open. |
| |
| • AC voltage is present but is out of operational |
| limits. The unit will restart when the ac returns to |
| the operating level. |
| • AC has just been applied and the rectifier will |
| momentarily start ( after an inrush control |
| delay ). |
The FAN ALM LED is | • The fuse of one or both fans has blown. |
lit. | • One or both fans have failed. |
| |
| Note 1 : If a single fan failed or a fuse blew, the |
| rectifier will continue to operate while |
| triggering a local and remote FAN ALM. |
| Note 2 : If two cascaded fans failed or both fuses |
| blew, the rectifier will shut down and |
| trigger local and remote RFA alarms. |
The SEN FAIL LED is | • One, or both, remote sense leads is |
lit. | disconnected. |
| • Excessive impedance in one or both sense |
| leads. |
| • The dc circuit breaker is open but the unit is in |
| remote sense. |
|
|
The CL LED is lit. | • The output load requirement exceeds the total |
| rectifier capacity. |
| • With paralleled units, the float or equalize is |
| maladjusted causing one or more units to carry |
| the load. |
| • The unit is in "equalize" mode and paralleled |
| units are not. |
| • The remote sense lead has excessive |
| impedance on one or more rectifiers. |
| • The system batteries are in recharge mode after |
| an ac outage. |
| • The current share mode selection is not the |
| same for all units. |
| • The forced share line is disconnected ( in FLS |
| only ). |
|
|
| |
|
|
UM5C05C P0745680 Standard 6.00 October 2001 | Emerson Energy Systems |
