Delta NT Series - Page 94

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Ultron NT Series
7.2.3.1 From Normal Mode to Manual Bypass Mode (Single)
WARNING:
,I\RXSHUIRUPWKHIROORZLQJWXUQRႇSURFHGXUHVDOOSRZHUVXSSO\LQJWRWKH
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to the UPS have already been safely shut down before you perform the turn-
RႇSURFHGXUHV
1. Press the ‘OFF¶DQGµ ¶EXWWRQVVLPXOWDQHRXVO\IRUVHFRQGV$IWHUWKHUHVHUYH
$&SRZHULVQRUPDOWKHYROWDJHDQGIUHTXHQF\RIWKHUHVHUYH$&SRZHULVZLWKLQ
the setup range), the inverter will be turned off immediately and it will be the
reserve AC power to supply power to the connected loads. At the same time, the
LCD will display ‘Bypass Mode¶
 7XUQRႇHDFKH[WHUQDOEDWWHU\FDELQHW¶VBattery breaker.
 7XUQRႇWKH5HFWL¿HU,QSXW breaker or switch.
4. (1) Wait about 5 minutes for the DC CAP to discharge, and ensure that the LCD
shows the battery voltage lower than 5V.
Or, (2) Press the ‘ON¶DQGµOFF¶EXWWRQVVLPXOWDQHRXVO\IRUVHFRQGVWROHWWKH
DC CAP to discharge, and ensure that the LCD shows the battery voltage lower
WKDQ9$IWHUFRQ¿UPDWLRQSUHVVWKHµOFF¶DQGµ
¶EXWWRQVVLPXOWDQHRXVO\IRU
VHFRQGVWR¿QLVKWKHGLVFKDUJHSURFHVV
5. Turn on the Manual Bypass breaker or switch. The connected loads will be
power-supplied by the manual bypass and the LCD will display ‘Manual Bypass
ON¶
 7XUQRႇWKHUPS Output breaker or switch and Reserve Input breaker or switch.
7. Disconnect all fuses. After that, the LCD will be OFF.
8. When the UPS is running in Manual Bypass Mode, there is no high voltage
inside the UPS except the wiring terminals and Manual Bypass breaker or
VZLWFK'RQRWWRXFKWKH836¶VZLULQJWHUPLQDOVDQGManual Bypass breaker or
switch during UPS maintenance process to avoid electric shock.