Control Signals Overview; Installing Bypass Control Wiring; Figure 4-10: Communication Interfaces - Eaton 93PM User And Installation Manual

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4.6.2 Control signals overview

Two controls signals (External CAN Network, Bypass Pull-Chain) are required for external paralleling.

Both of these control signals are fault tolerant and alarmed when disconnected.

External CAN (ECAN)

ECAN provides means for communications between the UPS's in a parallel system. The system will

continue to share load and protect the load when this network fails.

Bypass Pull-Chain

Bypass Pull-Chain is an open collector signal that goes low when the Bypass static switch of any UPS

is online. When External CAN (ECAN) is down, the pull-chain is low, and the UPS is online, the UPS

will lock to and transfer to bypass. Service can manually short this signal in some rare failure modes

to force a system transfer to bypass.

Signal Inputs Actions

Each UPS has maximum eight signal inputs, 5 native and one in each Mini-slot when using a suitable

connectivity device. These inputs can be configured with action items. The following action items

affect all 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 UPSs. All UPSs react in the same manner as if the action

item was active on that UPS.

Wiring EPO switch in parallel

It is recommended to use separate EPO circuit for each parallel unit.

During the installation, follow all the safety instructions given in the 93PM User's and

Installation Guide.

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 4-10: Communication

interfaces on page 50.)

The Phoenix Contact FRONT-MSTB 2,5/12-STF-5,08 plug component shall be used for cable

wiring termination.

1. External parallel connector

30-200 kW

User's and Installation Guide

P-164000249

Revision 2

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