Eaton Power Xpert 9395C, Инструкция по установке и эксплуатации

Страница: 109 / 175

92 Eaton Power Xpert 9395C UPS Installation and Operation Manual 164000821—Rev 06
66..22..66 M Maaiinntteennaannccee B Byyppaassss M Mooddee
The critical load is not protected from voltage or frequency fluctuations or power outages while the UPS is in
Bypass mode.
A maintenance bypass switchboard is used with the UPS to bypass the UPS system when maintenance is
required. The switchboard includes a maintenance isolation circuit breaker (MIB) and a maintenance bypass
circuit breaker (MBB).
A Solenoid Key Release Unit (SKRU) is utilized in a key interlock scheme between the MIB and MBB breakers.
A load bank breaker (LBB) is also provided and is interlocked with the MIB breaker. See the following transfer
sequences for transferring the critical load to and from maintenance bypass and the UPS system to and from
the load bank.
The maintenance bypass switchboards also contain module output breakers and various load distribution
breakers. Please see the switchboard as-built drawings for details.
NOTE The breaker names for the maintenance bypass switchboards used at the CYS01
location use MB02 and MB03 in place of MBB and TB01 in place of MIB.
66..22..77 TTrraannssffeerr ttoo M Maaiinntteennaannccee B Byyppaassss aanndd LLooaadd B Baannkk S Seeqquueennccee
Key Operation: Transfer UPS system to Maintenance Bypass
1. Place the UPS in Bypass mode. See the applicable UPS Operation/Installation manual for details on
transferring the UPS to Bypass mode.
NOTE Key K-MB cannot be released from the SKRU until the UPS is in Bypass mode. Once key
K-MB is turned and released from the SKRU, the UPS transfer to normal (On Inverter)
will be inhibited.
2. Verify that the ENABLE light on the SKRU is illuminated. Turn and release key K-MB from the SKRU lock.
3. Insert key K-MB into the MBB breaker lock. Turn key K-MB to unlock the MBB breaker. Close the MBB
breaker.
4. Open the MIB breaker. Turn and remove key K-UO form the MIB lock and insert it into SKRU lock. The
UPS is now in Maintenance Bypass mode. The critical load is supported by the maintenance bypass
source.
NOTE The critical load IS NOT supported while in Maintenance Bypass mode.
Key Operation: Transfer UPS system to Load Bank
1. Verify the UPS has been transferred to Maintenance Bypass mode. See previous procedure.
2. Remove key K-LB from the MIB breaker. Insert key K-LB into the LBB lock.
3. Verify key K-ML is in the LBB breaker lock. If not present, remove key K-ML from one of the other Load
Bank breakers common to the system Load Bank and insert into the LBB lock.
NOTE Multiple systems share a common load bank. A single K-ML key is used to prevent more
than one system from being connected to the load bank at a time. Key K-ML must be
inserted in the Load Bank breaker lock of the system to be connected to the load bank.
4. Turn key K-LB to unlock the LBB breaker. Close the LBB breaker.
Understanding UPS Operation