KE RT Series UPS 6-10kVA UL 208-220-230-240Vac User Guide English 20180130 This manual is for qualified personnel only
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At startup, the internal fan of the UPS starts spinning, the UPS performs self-diagnostics until buzzer
beeps twice and the UPS is stable. The UPS then goes to bypass supply, the Utility LED and Bypass
LED are Green, and the inverter starts up. When the inverter is “normal”, the UPS goes to normal mode
and the load is supplied by the inverter.
The LCD display will indicate current status. The top lines display the UPS operational status and the
bottom lines indicate alarm conditions, when they occur.
5.2.2
Black (Cold) start procedure
Follow these procedures when the input AC Utility Fails, but
battery is normal.
Turn on the battery switch - The battery will feed the Auxiliary
power board.
Press the black start buttons (position 9).
When the battery is normal the rectifier starts operation, 30s later
the inverter starts, INV and output light up.
CAUTION
Wait for approximately 30 seconds before you press the black start key
5.2.3
Inverter Off
When the Utility is normal, press “ESC /OFF” button for approx. 1 sec until beep sounds, the inverter
LED will extinguish, the bypass LED on, then the UPS turns to bypass supply.
When the UPS is on battery mode or without AC, press “ESC /OFF” button for approx. 1 sec until beep
sounds, the output of the UPS is off, fan stop spinning. After 60 seconds, all the LED on the LCD
display extinguish.
5.2.4
Disconnecting with Utility
CAUTION
This procedure should be followed to completely shut down the UPS and the LOAD.
After all power switches, isolators and circuit breakers are opened, there will be no
output.
WARNING
Wait for about 5 minutes for the internal D.C. bus bar capacitors to be completely
discharged.
After the inverter is off, turn the Utility and battery breakers to “OFF”, then the LCD display
will extinguish completely and fan stops spinning in 60 seconds. If there are external battery
packs connected, please also turn the battery breaker to “OFF”.
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