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The Bypass mode red light on the MBP goes on, indicating that the load is powered directly from
utility power or, if so wired, by the Bypass AC source.
Step 4.
Pull out the yellow tab on the MBP rotary switch and install a lock to ensure that the switch remains
in the Bypass position, to prevent the load from losing power during servicing.
Step 5.
Switch the MBP's UPS Input switch and UPS Bypass Input switch (3Phase model only) to the 0
(off) position.Install locks to ensure that they remain in the 0 (off) position.
Important: To prevent exposure to hazardous voltage, the switches must remain in the 0 (off)
position during servicing and while the UPS is disconnected.
Figure 11. Locking the UPS Input switch (8/11k VA 1Phase)
Figure 12. Locking the UPS Input switch and UPS Bypass Input switch (8/11k VA 3Phase)
Step 6.
Wait 30 seconds for the UPS to stop functioning.Check the UPS display panel to verify that the
UPS is not functional.
Step 7.
Remove the access cover on the terminal block cover and use a voltmeter to ensure that hazardous
voltage is no longer present.
Important: Proceed only when no hazardous voltage is present on any terminal.
Step 8.
Unlock the conduit from the UPS terminal block cover.Then, loosen the set screws holding the
cable wires in the terminal block, and remove the cables.
Step 9.
Connect the just-exposed wires together to help prevent exposure to hazardous voltage.
.
Chapter 7
UPS maintenance
53
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