Eaton 93PM - Installing Bypass Control Wiring

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 maximum 8 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.
Wiring the EPO switch in parallel
It is recommended to use separate EPO circuits for each parallel unit.
5.7.3 Installing bypass control wiring
• During the installation, follow 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
5.7.3 ).
• The Phoenix Contact FRONT-MSTB 2,5/12-STF-5,08 plug component shall
be used for cable wiring termination.
Figure 29. Communication interfaces
1
External parallel connector
Eaton 93PM UPS 30–200 kVA User's and installation guide
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Eaton Corporation plc 2017. All rights reserved. Revision: 005 Document ID: P-164000249 76 (126)