Chapter 6 Operating Instructions
MUST400_User manual_EN_REV02 User Manual
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6.8 Operation Instruction for Power Module Maintenance
Only a trained operator can perform the following procedures.
Maintenance guidance for power modules.
If the system is in normal mode and the bypass is normal, and the redundant number of power module is at
least 1:
1. Enter in
function menu (need password 2) and press “FaultClr” to release shutdown power module
function.
2.
Press “off” button on the front panel of power module to manually power off power module.
3. Remove the screws in front of the power module and remove it after 2 minutes.
If there are no redundant power modules:
1.
Enter in function menu (need password 2) and press “Tran byp” to transfer to bypass mode.
2. Remove the screws in front of the power module and remove it after 2 minutes.
Note
To ensure the safety, be sure to use a multi-meter to measure the DC bus capacitor voltage and ensure the
voltage is below 60V before operation.
3. After finishing the maintenance of the power module, insert the power module in the frame (the inserting
interval for each module is longer than 10s), the power module will automatically join the system operation,
and then tighten the screws at the two sides of the power module.
Maintenance guidance for bypass power module
Note
The bypass power module cannot be maintained in battery mode.
If the system is in normal mode and the bypass is normal:
1. Make the maintenance procedure referring to section 6.3.1. Close the maintenance bypass breaker and
the UPS transfer to maintenance bypass mode.
2. Press EPO button to ensure the battery current is 0. Open the battery circuit breaker or disconnect battery
terminals.
3. Open mains input breaker and output breaker.
4. Remove the bypass power modules that need maintenance or repair, wait for 5 minutes and then maintain
the bypass power modules. After finishing the maintenance of the bypass power modules, insert the
modules.
5. Transfer to normal mode as section 6.3.2.
Note
The terminal of bypass power module is big, and it need more power when inserting bypass module to make
sure tighten connection.
警告
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警告
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警告
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