SMARTZONE UPS USER MANUAL
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Appendix G: 10 to 20kVA Back-feed Port
Definition
UPS
Instruction
Pin1/PIN2
Normally NO
Pin3/PIN4
Normally NC
Function description: These ports are driven to the opposite polarity when a Back-feed
alarm is detected. The Back-feed alarm is activated when the inverter and bypass are
enabled or connected to the load at the same time. The UPS will shut down when this
event occurs.