Eaton 93PM G2 - Control Signals Overview

A Bypass inputs to UPSs 1 UPS 1 7 Battery
B Outputs from UPSs 2 UPS 2 8 Battery
C Load 3 UPS 3 9 MOB1
4 UPS 4 10 MOB2
5 Battery 11 MOB3
6 Battery 12 MOB4
The required parallel system wiring length must be equal to ensure approximately equal current sharing
when in the bypass mode.
For proper operation, the following must be true: 1A+1B=2A+2B=3A+3B=4A+4B.
Any differences in wire length result in decreased capacity and improper operation of the UPS system
while in the bypass mode.
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Two control signals (External CAN Network, Bypass Pull-Chain) are required for external paralleling. Both
of these control signals are fault-tolerant and alarmed when disconnected.
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ECAN provides a means for communication between the UPSs in a parallel system. The system will
continue to share load and protect the load when this network fails.
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Bypass Pull-Chain is an open collector signal that goes low when the bypass static switch of any UPS is
active. When External CAN (ECAN) is down and the pull-chain goes low while the UPS is online, the UPS
transfers and locks to the bypass mode. Service personnel can manually short this signal in some rare
failure modes to force the system transfer to bypass.
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Each UPS has a maximum of 9 signal inputs, 5 native and 1 in each MiniSlot when using a suitable
connectivity device. These inputs can be configured with action items. The following action items affect all
the UPSs in the system. When an action item is active on a UPS and the MOB is closed, the action item is
transmitted on the ECAN to all the UPSs. All the UPSs react in the same manner as if the action item was
active on that UPS.
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It is recommended to use separate EPO circuits for each parallel unit.
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• During the installation, obey all the safety instructions given in this document.
• A 12-pin terminal block for external parallel control signals is accessible on the right side of the
communication interface, on the top section of the UPS (see Figure
24: X9 External parallel interface).
EATON 93PM G2 UPS USER’S AND INSTALLATION GUIDE P-164000956
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February 2021 www.eaton.eu 5577