Tripp Lite SU60KX Manual page 98

6 Power Module (continued)
6.1 Failure Power Module Identify (continued)
5) (Use this step to shut down the UPS with load protection)
Set UPS to manual bypass mode.
If the UPS is on normal mode, press the "OFF" button to enter bypass mode. Then turn on the manual bypass circuit breaker (Q3) and turn off the
output circuit breaker (Q4). (Figure 6.1e)
Next, turn off the main input circuit breaker (Q1) so that the power module discharges its DC BUS voltage. Monitor the power module's output
(Figure 6.1d) and DC BUS voltage (Figure 6.1c) using the LCD panel.
These voltages will decrease gradually within each normal power module.
Ultimately, normal power modules will shut down (with fans inactive), while faulty power modules will still be pending (no discharge, fans still
active).
Finally, turn off the battery switch to force the power modules to shut down. At this point, faulty power modules have either failed or are being
protected.
6) Turn on the main input circuit breaker. Then, once the fan is active, turn off the main input circuit breaker. Normal power modules will shut
down instantly, while faulty power module will discharge DC BUS voltage.
Failed power modules can be identifi ed by the following:
• Inactive fans
• Alarm message on LCD
If neither of these occur, follow step 7 to ascertain that the faulty power modules are protected.
7) Turn on the main input circuit breaker and observe whether the power module's DC BUS voltage (Figure 6.1c) ever reaches +/- 370Vdc. If it
does not, or you receive an alarm message, the power module has failed.
Turn off the main input circuit breaker and monitor the output message for each power module (Figure 6.1d). If the output voltage is abnormal or
you receive an alarm message, the power module has failed.
Q4 Q3 Q2
Manual Bypass
Output
Bypass Input
Q1: Input Circuit Breaker
Q2: Bypass Input Circuit Breaker
Q3: Manual Bypass Circuit Breaker
Q4: Output Circuit Breaker
Fig 6.1e
116
Q1
Main
Input