Powerware 30-160kVA - Manual (Page 21)

17
Powerware 9315 Maintenance Bypass Module 30---160kVA
164201177 Rev. C 041500
MBM Operation With Kirk Key Interlocks (Optional)
The following transfer sequence is the recommended procedure for the
step-by-step load transfer from and back to the UPS when required. This
information is provided on a label located on the deadfront panel behind
the right front door of the MBM.
Kirk Key Solenoid Release Unit (SKRU)
The 120 VAC operating power for the Kirk Key Solenoid Release Unit (SKRU) is
derived from the Maintenance Bypass source.
The Kirk Key SKRU is provided to prevent access to the key, which is necessary to
initiate the transfer sequence. The operator must observe the instructions on the
Transfer Sequence nameplate mounted on the MBP Panelboard.
Electrical interlocks inhibit key release until UPS is in the Bypass mode.
MBM Transfer Sequences
From UPS Bypass to Maintenance Bypass:
1. Confirm BIBs, if installed, are closed.
2. Transfer UPS from Normal to Bypass mode (see UPS Operation manual).
NOTE: For Parallel Redundant systems, transfer both UPS modules to
Bypass mode.
3. Depress pushbutton on the solenoid key release unit (SKRU). Turn and
remove key “A”. Key “A” may be removed when UPS system is in Bypass
mode as indicated by illuminated pilot light.
4. Insert key “A” into MBP lock, retract bolt, close MBP breaker. Remove key “B”.
CAUTION:
Failure to close MBP breaker results in loss of power to the critical load.
5. Insert key “B’ into MIS lock, open MIS breaker, extend bolt. Remove key “A”.
6. Insert key “A” into solenoid and turn key to LOCK position.
7. Deenergize UPS before servicing (see UPS Operation manual).
CAUTION:
For UPS electrical isolation, BIB breaker (if applicable) must be opened.