9
3C
5
During this process, ensure that each section is properly supported after they are separated. If the sections are detached in a rackmount application, be
sure that each section remains adequately supported by the UPS system’s rackmount rails. If the sections are detached in a tower application, be sure
that the PDU is supported by the UPS system’s tower feet. Adjust the tower feet so they are as close together as possible.
WARNING! High Voltage! Risk of electrical shock!
Warning: Use extreme caution when handling the PDU.
Do not allow the contacts to touch any surface.
To reattach the PDU, reverse the process listed above.
Output/Bypass Breaker Operation
Output Status (Normal Operation) Parallel PDU Output Breakers Maintenance Bypass Breaker
Output coming from both UPS systems. ON OFF
Output Status (Redundancy Mode) Parallel PDU Output Breakers Maintenance Bypass Breaker
Output coming from Primary UPS. Secondary UPS
needs repair. (Refer to Step 3, Part A.)
ON OFF
Output coming from Secondary UPS. Primary UPS
needs repair. (Refer to Step 3, Part B.)
ON OFF
Output Status (Power Mode) Parallel PDU Output Breakers Maintenance Bypass Breaker
Primary and Secondary UPS output coming from
Bypass. (Refer to Step 3, Part C.)
ON ON
Note: Units will operate in Redundancy Mode up to 8 or 10kVA and switch to Power Mode at loads greater than 8 or 10kVA.
Manual Bypass Operation (for UPS maintenance or replacement) continued
STEP 3. Part A: When the output is coming from the Primary UPS
and the Secondary UPS needs repair, press the Secondary
UPS system’s OFF button, if the UPS is powered, until you
hear a beep and see a “STANDBY MODE” message shown in
the LCD display.
Part B: When the output is coming from the Secondary UPS
and the Primary UPS needs repair, press the UPS system’s
OFF button, if the UPS is powered, until you hear a beep
and see a “STANDBY MODE” message shown in the LCD
display.
Part C: When both power modules show output is in Bypass,
set the Maintenance Breaker Switch to the ON position before
servicing.
STEP 4. Disconnect any external battery module(s) from the UPS
power module being serviced.
STEP 5. At the rear of the UPS being serviced, remove the 2 screws
that secure the PDU to the power module. If both power
modules are in need of service, remove all 4 screws.
STEP 6. Remove the rackmounting hardware from the front panel
of the UPS. Using an assistant at each end, carefully pull
the power module away from the PDU, being careful not
to disconnect the parallel cable. Once the power module
is pulled from the PDU and powers down, disconnect the
parallel cable from the power module.
The UPS power/battery module is now safely powered down
and it can be detached from the PDU to perform maintenance/
replacement.
