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PRELIMINARY
6.2 Power Module Replacement
6 Power Module (continued)
To remove the power module:
WARNING: Before opening the unit, please make sure that the UPS is in Manual Bypass mode so that it
continues to supply power to the critical load (the critical load is supported directly by utility power).
WARNING: Make sure that the UPS unit is shut down completely. (Main Input circuit breaker (Q1), Bypass
Input circuit breaker (Q2) and Output circuit breaker (Q4) must be OFF (see Figure 6.2a).)
Q4 Q3 Q2 Q1
Q1: Input Circuit Breaker
Q2: Bypass Input Circuit Breaker
Q3: Manual Bypass Circuit Breaker
Q4: Output Circuit Breaker
Output
Manual
Bypass
Bypass
Input
Main
Input
Fig 6.2a
Fig 6.2b
a) Unscrew the rear panel cover (Figure 6.2b).