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KEYED MECHANICAL INTERLOCK OPERATION
The MBS ships with a keyed mechanical interlock or SKRU (Solenoid Key Release Unit) interlock. Operation instructions
for both models are shown below, and also displayed on the MBS breaker panel.
NOTICE: Both MBS procedures are make-before-break. Ensure the UPS is in BYPASS mode before switching to
Maintenance Bypass.
Failure to switch the UPS to BYPASS before engaging the MBS may result in damage to the MBS, UPS or both.
3-Breaker MBS with Keyed Mechanical Interlock
Place MBS in Maintenance Bypass Mode
1. Transfer the UPS to static bypass. Verify UPS is in Bypass.
2. Unlock CB2.
3. Close CB2 (Maintenance Bypass Breaker)
4. Open CB3 (UPS Output Breaker)
5. Remove the key from CB2, and insert it in CB3.
6. Lock CB3.
7. Open CB1.(UPS Input Breaker).
Place MBS in UPS Online Mode
1. Close CB1 (UPS Input Breaker).
2. Turn UPS ON. Verify UPS is in Bypass.
3. Turn ON all UPS Battery DC breakers.
4. Unlock CB3.
5. Close CB3 (UPS Output Breaker)
6. Remove the key from CB3, and insert it in CB2.
7. Open CB2 (Maintenance Bypass Breaker)
8. Lock CB2.
9. Return UPS to Online Mode.
3-Breaker MBS with SKRU (Solenoid Key Release Unit)
Place MBS in Maintenance Bypass Mode
1. Transfer the UPS to static bypass. Verify UPS is in Bypass.
2. Turn and extract key A-1 from the SKRU and insert the key in CB2.
3. Unlock CB2.
4. Close CB2 (Maintenance Bypass Breaker)
5. Open CB3 (UPS Output Breaker)
6. Lock CB3.
7. Remove key B-1 from the lock on CB3, and insert it in the SKRU and turn.
8. Open CB1 (UPS Input Breaker).
Place MBS in UPS Online Mode
1. Close CB1 (UPS Input Breaker).
2. Turn UPS ON. Verify UPS is in Bypass.
3. Turn ON all UPS Battery DC breakers.
4. Turn and extract key B-1 from the SKRU. Insert it in the lock on CB3.
5. Unlock CB3.
6. Close CB3 (UPS Output Breaker)
7. Open CB2 (Maintenance Bypass Breaker)
8. Lock CB2. Remove key A-1 from CB2, and insert it in SKRU and turn.
9. Return UPS to Online Mode.
MBS (Wallmount) Installation - 64523-009
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