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ZY120 6-20kVA (11) User Manual EN rev.04.doc
1) Before installing a new parallel UPS system, user need to prepare the input and output
wires, the output breaker, and the parallel cables.
2) Open the input and output breakers of each UPS. Connect the input wires, output wires
and battery wires.
3) Connect each UPS one by one with the parallel cables.
4) Close the battery breakers and the input breakers of all of the UPSs in the parallel system
in turn.
5) Turn on each UPS in turn and observe their display. Make sure that each UPS displays
normal and all the UPSs transfer to the INV mode normally.
Notice: close output 1# breaker and 2# breaker as fig.7 to make sure that output of every UPS
are shorted before starting UPS, or else the parallel system will fail to start.
3. How to remove a single UPS from the parallel system:
1) If you need to remove one UPS of the UPSs parallel system which is on normal running,
press the ON/OFF button of the UPS that is confirmed to be removed continuously and the
UPS will cut off its output immediately.
2) Turn off the input breaker, the external mains input breaker, the output breaker and the
battery breaker.
3) Press the others UPSs’s ON/OFF button. All of them transfer to the Bypass mode.
4) Remove the parallel cables of the UPS that need to be removed.
5) Press ON/OFF button of remained UPSs, then press YES to make the UPSs transfer to
INV output.
7.3 Maintenance Bypass Mode
Maintenance Bypass Mode operates on the condition that the inner power supply of the
UPS is cut off and the load is supplied by the maintenance bypass.
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