Liebert EXL S1 CONNECTIVITY PANELS
User Manual 10H52226UM60 - Rev. 1 - 01/2017
72
4.2.8. X29 - Connector for Backfeed Status (Output)
This contact will provide Backfeed Protection according to IEC/EN 62040-1+A1:2013. This output can
be used to trip or drive a contact in order to insulated the bypass input line when a SCR failure occurs.
This 3-pole screw connector is used to activate an external magnetic contactor (MC) if the UPS
detects a Backfeed current through the bypass in double conversion mode.
This can be caused by a short circuit in the bypass thyristor branch of the UPS.
The maximum cable diameter is 0.75mm
2
.
The Interface is SELV - isolated from UPS primary circuits.
4.2.9. XP4 - Battery Area Temperature sensor (input)
Input for the battery area temperature sensor.
The interface is a 2-pole screw terminal (Phoenix 1.5/2 STF) that accepts wires up to 0.75mm
2
.
4.2.10. XP19A/B - SUB-D connector for parallel UPS connection
This interface is used for paralleling 2 or more UPS with each other.
It enables data exchange between UPS electronics so that the UPS can provide a common output.
The Interface is SELV-isolated from UPS primary circuits.
PIN Signal Explanation
PIN 1 Backfeed switch n.c. Open when backfeed is detected
PIN 2 Backfeed switch common Common contact
PIN 3 Backfeed switch n.a. Close when backfeed is detected
Warning
The output of the external backfeed circuit connected to X29 must not exceed:
• 24VDC, 1A
• 230VAC, 3A
Warning
X29 are voltage free contacts fully isolated from UPS primary circuits.
If a voltage higher than 40V is applied to control an external disconnection device, X29
can no longer be considered safe.
Pin Signal Explanation
1-2 TEMPERATURE SENSOR Temperature sensor
Warning
This interface and its function are for authorized Vertiv service technicians, only. Do not
remove any connected cable from this interface or connect any cable to it.
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