5.7.2
Control signals overview
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.
External CAN (ECAN)
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
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 locks to and transfers to the bypass
mode. Service personnel can manually short this signal in some rare failure
modes to force the system transfer to bypass.
Signal Inputs Actions
Each UPS has a maximum of 9signal 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.
Wiring the EPO switch in parallel
It is recommended to use separate EPO circuits for each parallel unit.
5.7.3
Install bypass control wiring
•
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 23: X9 External parallel interface
•
Use the Phoenix Contact FRONT-MSTB 2,5/12-STF-5,08 plug component
for cable wiring termination.
© Eaton Corporation plc 2020. All rights reserved.
Revision: 001
Document ID: P-164000956
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Eaton 93PM G2 UPS 50 – 360 kVA
User’s and Installation Guide