Eaton 93PR Series - 4.5.2. Control signal overview

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1C
1C
2C
2C
3C
4C
3C
4C
UPS 1
UPS 2
UPS 3
UPS 4
Outputs
from UPSs
Battery
Battery
Battery
Battery
1A
1B
2A
2B
3B
4B
3A
4A
UPS 1
UPS 2
UPS 3
UPS 4
Battery
Battery
Battery
Battery
Outputs
from UPSs
Wiring diagram of the parallel system
Figure 4-5: Schematic diagram of the parallel UPS system
4.5.2. Control signal overview
The external parallel system needs two control signals (external CAN Network, bypass Pull-Chain). The two
control signals are employed for the purpose of fault tolerance, namely, when one of them is interrupted, the
system can continue normal operation and gives an alarm.
In 93PR 15–80k, ECAN and Pull-Chain signals are integrated in an RJ45 terminal, and parallel signal con-
nection is performed by PAR IN/PAR OUT ports. See
Figure 5-1 .
External CAN (ECAN)
External CAN is employed for the purpose of communication between the UPS units in parallel. The system
can ensure current sharing and protect the load even when CAN fails.
Bypass Pull-Chain
Bypass Pull-Chain is an open-circuit output signal. When any UPS in the parallel system switches to the by-
pass, the signal is pulled low. When external CAN (ECAN) doesn’t work, Pull-Chain is pulled low. If the UPS
is at online state, the UPS will be locked and switched to bypass mode. In this fault mode, the customer
service personnel can short the signal and switch to the bypass.
Signal input actions
Each UPS bears 3 sets of signal inputs which can congure the functions. These functions may affect the
UPS in every system.
Wiring of the parallel EPO switch
It’s recommended that each parallel unit uses a separate EPO circuit.
Bypass inputs
to UPSs
REC inputs
to UPSs