BByyppaassss PPuullll--CChhaaiinn
Bypass Pull-Chain is an open-circuit output signal. When any UPS in a parallel system transfers to
Bypass mode, the signal goes low. When External CAN (ECAN) is down and the pull-chain goes low while
the UPS is at online state, the UPS transfers and locks to Bypass mode. In this fault mode, the customer
service personnel can short the signal and transfer the system to bypass.
SSiiggnnaall IInnppuutt AAccttiioonnss
Each UPS has three sets of signal inputs, which can be configured with action items. These action items
may affect all the UPSs in a parallel system.
WWiirriinngg tthhee EEPPOO sswwiittcchh iinn ppaarraalllleell
It is recommended to use separate EPO circuits for each parallel unit.
55..55..33 EExxtteerrnnaall ppaarraalllleell ssyysstteemm ccoonnttrrooll wwiirriinngg
During the installation, obey all the safety instructions given in this document.
1. The external parallel control signal is connected through two RJ45 ports: external parallel port (IN) and
external parallel port (OUT).
For the location of the ports, refer to Figure
24: Communication interfaces. For the wiring
configuration, refer to Figure
33: Simplified CAN and Pull-Chain wiring for parallel UPS system.
Figure 33. Simplified CAN and Pull-Chain wiring for parallel UPS system
1. Pin 9 A Terminating resistance 120 Ω
2. Pin 10 B UPS 1
3. Pin 11 C UPS 2
4. Pin 12 D UPS 3
5. Pin 13 E UPS 4
6. Pin 14
EATON 93T USER’S AND INSTALLATION GUIDE 614-40270
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December 2023 www.eaton.eu 5588
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