P-164000341 8-10 kVA, 50/60 Hz (1-phase input) &
8-15 kVA, 50/60 Hz (3-phase input)
45
Revision 1 User's Guide
7.3.5 Earth fault monitor (option)
The earth fault monitor is used to detect earth fault in UPS by monitoring the system's insulation
resistance. The device is connected to the supply via terminals A1-A2. Terminal L is connected to the
monitored voltage and PE terminal is connected to earth.
If the insulation resistance drops below the adjusted alarm value, the red LED goes on and the output
relay switches off. The earth fault monitor is in auto reset mode when a bridge between terminals
LT1 and LT2 is connected. Now the output relay switches back on if the insulation resistance gets
back to normal. Without the auto reset mode on, the insulation monitor remains in faulty state even
when the insulation resistance gets back to normal and the reset needs to be done manually by
pressing the reset button.
When the UPS is equipped with an internal Maintenance Bypass Switch (MBS), the control input X45
is reserved for the status information from the MBS. In this case the earth fault signal shall be taken
straight from the terminals 11 and 14 of the earth fault monitor.
Figure 7-5: Earth fault monitor and the connection diagrams for 9155 and 9355 models
7.4 XSlot communication (option)
XSlot modules allow the UPS to communicate in a variety of networking environments and with
different types of devices. The UPS incorporates two (2) empty XSlot communication bays.
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