COMMUNICATION
EATON
BladeUPS
®
(12 kVA) User's Guide
S
164201649 Rev 4
www.eaton.com/powerquality
87
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 that is 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:
S
Failure of the fan, fuse, temperature sensor, or power supply
S
Inverter AC under voltage
S
Battery current limit
S
DC link under voltage
S
Battery over voltage
Redundant Signal Wiring
BladeUPS 12i model only.
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 only.
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.
Auto-Identification
The BladeUPS parallel system can assign identities to each UPS in the system
automatically. To take advantage of this feature, wire the CAN Bridge Cards together
as described in “Parallel UPS Installation” on page 43.
When starting up, the UPS with the blue terminating plug installed in the CAN IN port
identifies itself as UNIT 1. The next UPS wired identifies itself as UNIT 2, and so forth.
The last UPS with the second blue terminating plug installed in the CAN OUT port
terminates the RJ-14 cable network. The auto-identification sequence takes about
15–20 seconds to complete once all the UPSs in the parallel system have logic power.
If a UPS is shut down or otherwise loses logic power, the UPS will re-identify itself in
the proper sequence once logic power is restored.
Summary of Contents for Powerware Series
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