50
30-200 kW
P-164000249
User's and Installation Guide
Revision 2
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.
4.6.3 Installing bypass control wiring
1.
During the installation, follow all the safety instructions given in the 93PM User’s and
Installation Guide.
2.
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.)
3.
The Phoenix Contact FRONT-MSTB 2,5/12-STF-5,08 plug component shall be used for cable
wiring termination.
1.
External parallel connector
Figure 4-10: Communication interfaces
