11.2.2 Service Procedures of Power Module
1. Place the ready switch on the front panel of the power module to unready state, at this time, the green indicator
beside the ready switch is off and the red indicator is on.
2. Ensure that the red indicator on the power module is solid on, remove the fixing screws on both sides of the front
panel of the module, and pull the module out of the cabinet.
N O T E: The m od ule will be blocked by a spring piece on the left side of the modu le when the m od ule
is pulled out of the cabinet halfw ay. At this point, you m ust press the sp ring piece b efore you
continue to p ull the m odule out.
3. After servicing the module, check that the ready switch is in unready state.
4. Push the module (at least 10s after another) into the cabinet, and tighten the screws on both sides.
5. Place the ready switch of the module to the left position, and the module will connect to the system
automatically.
11.2.3 Replacement Procedures of Bypass Power Module
Service procedures in bypass mode
1. Make the UPS work in Normal mode or Maintenance bypass mode, refer to Procedures for Transfer Between
Operation Modes or Operation Procedures for Parallel System.
2. Place the ready switch on the front panel of the power module to unready state, at this time, the red indicator
beside the ready switch is on.
3. Remove the fixing screws on both sides of the front panel of the bypass power module, and pull the module out
of the cabinet, then maintain the module.
4. After servicing the module, push the module into the cabinet, and tighten the screws on both sides.
N O T E: W hen pulling the b ypass pow er m odule out of the cabinet, m ove it around and pull outw ard
m any tim es. W hen inserting the b ypass pow er m odule, you should insert it forcibly, otherwise the
byp ass pow er m odu le m ay have poor con tact w ith the system , thus affect the norm al operation of
the b ypass pow er m odule an d the overall u nit. T he standard for the b ypass p ow er m odule norm al
insertion p osition is that th e b rackets on both sides of the bypass pow er m odule can be close to the
cabin et colum n.
5. Place the ready switch to ready state, at this time, the red indicator beside the ready switch is off.
6. Transfer the UPS to Bypass mode, refer to Procedures for Transfer Between Operation Modes or Operation
Procedures for Parallel System.
Service procedures of single UPS in normal mode
1. Place the ready switch on the front panel of the power module to unready state, at this time, the red indicator
beside the ready switch is on.
2. Remove the fixing screws on both sides of the front panel of the bypass power module, and pull the module out
of the cabinet.
3. After servicing the module, push the module into the cabinet, and tighten the screws on both sides.
4. Place the ready switch to ready state, at this time, the red indicator beside the ready switch is off while the green
indicator is on.
11 Service and Maintenance
167
Vertiv™ Liebert® APM Plus User Manual
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