Parallel Communication; Mode Transfers; Redundant Signal Wiring - Eaton Powerware BladeUPS User Manual

COMMUNICATION

Parallel Communication

The CAN Bridge Card in each paralleled UPS provides connectivity for
system metering and operational mode control. Startup, shutdown, and
auto-calibration commands given at one UPS also command the other
UPSs in the parallel system. The UPSs in a parallel system are in
constant communication to monitor settings and status information.

Mode Transfers

If one UPS in a parallel system transfers from High Efficiency operation
to Standard operation, the other UPSs transfer also.
When a parallel system is on battery, the front panels display the battery
status information of the battery with the lowest runtime remaining.
When the first UPS shuts down, the other UPSs also shut down. In a
parallel system not fully loaded, the system shifts load to UPSs with the
strongest batteries or additional EBMs to maximize runtime.
In a parallel system configured for redundancy, the UPSs use a
distributed bypass, and the following alarms cause an individual UPS to
shut down instead of transferring to Bypass mode:
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Redundant Signal Wiring

BladeUPS 12i model. The redundant signal wiring provides redundant
backfeed protection in case of CAN failure in the parallel system. If the
CAN fails, the UPSs transfer to Normal mode. The system runs
unsynchronized, and any UPS can transfer to Battery mode as
necessary. If any UPS must transfer to Bypass mode, the redundant
signal wiring allows the entire parallel system to transfer to Bypass
mode without backfeeding.
BladeUPS 12 model. The redundant signal wiring provides synchronization
protection in case of CAN failure in the parallel system. The system uses
the redundant signal wiring to determine the system state when the
CAN is down. The system operates the same as with CAN, except for a
Check Parallel Board alarm.
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EATON Powerware
Failure of the fan, fuse, temperature sensor, or power supply
Inverter AC under voltage
Battery current limit
DC link under voltage
Battery over voltage
® BladeUPS ® (12 kVA) User's Guide
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164201649 Rev 3 www.powerware.com