Installing Signal Interface Connections In A Parallel System; Wiring Parallel 93Pm Ups Systems; Power Wiring Overview - Eaton 93PM User And Installation Manual

Eaton 93PM UPS 30–200 kVA
8. When all the wiring is completed, close the front door and secure it with the
latch.
5.6.6
The installation of the signal interface connections in a parallel system is done
by following the aforementioned instructions. Signal inputs can be paralleled
between the units, that is, the same contact can be used for several units' signal
input signaling. This concerns also the EPO signal.
5.7
The outputs of multiple 93PM UPS systems can be connected in parallel. Up to
8 units can be paralleled. The UPS static bypass power rating needs to be
identical among all the paralleled units. However, paralleled UPS cabinets can
be housed with different number of UPM power modules.
The outputs are paralleled to increase the load capacity of the power system
and for redundancy. The system is paralleled for (N+1) redundancy, as long as
there is always one or more UPS online than required to support the load. The
system is paralleled for capacity if all UPSs in a system are required to support
the load.
Communication between the UPSs is required for system metering and mode
control. The system level communication and control are accomplished using a
Controller Area Network (CAN). A pull-chain signal in each UPS, connected to
the other UPSs in parallel and tied to the bypass status relay in each UPS, is
used for a secondary communication path. This arrangement ensures bypass
control even if the CAN bus is lost.
Do not connect units equipped with an internal Maintenance Bypass Switch
(MBS) or internal transformers in parallel.
5.7.1
See Section
installation practices.
Input feed
The input feed is defined as the power source connected to the UPS rectifier.
The feed to all UPS's inputs must be derived from the same source.
Bypass feed
The bypass feed is defined as the power source connected to the UPS bypass.
The feed to all UPS's bypass must be derived from the same source. The
©
Eaton Corporation plc 2017. All rights reserved.

Installing signal interface connections in a parallel system

Wiring parallel 93PM UPS systems

Power wiring overview

4.3.2
for the recommended cable and external fuse sizes and
WARNING
Revision: 005 Document ID: P-164000249
User's and installation guide
73 (126)