Test Procedure; Black(Cold) Start Procedure; Maintenance Bypass - KStar YDC9300-RT Operational Manual

4.2.2 Test procedure

CAUTION!
The UPS is operating normally.
It may take 60 seconds to boost up the system and perform self-test completely.
◆ Switch off the MAINS to simulate utility failure, the rectifier will turn off and the battery
should feed the inverter without interruption. At this time, the LEDs of battery, inverter and
output should be turned on .
◆ Switch on the MAINS to simulate utility recovery, the rectifier will restart automatically
after 20 seconds and the inverter will supply to the load. It is suggested to use Dummy
loads for testing. The UPS can be loaded up to its maximum capacity during load test 。

4.2.3 Black(Cold) start procedure

CAUTION!
Follow these procedures when the input AC Utility Failure, but battery is normal
◆ Turn on the battery switch .
The battery will feed the Auxiliary power board .
◆ Turn on the Output switch
◆ Trigger the cold start buttons of the modules respectively as the position 4 of the above
drawing.
When battery normal, rectifier starts operation, 30s later, inverter starts and
operates, INV and output light up.
CAUTION!
Wait fo r approximately 30 seconds before you press the black start key

4.2.4 MAINTENANCE BYPASS

To supply the load via Mains, you may simply active the internal mechanical bypass switch.
CAUTION!
The load is not protected by the UPS when the internal mechanical bypass system is
active and the power is not conditioned.
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