Turn On/Off Ups; Restart Procedure; Test Procedure; Maintenance Bypass - LEGRAND NUMERIC HP i 33 User Manual

5.2 Turn ON/OFF UPS

5.2.1

Restart procedure

• Set the Battery Breaker to the 'ON'
• Switch ON UPS input Bypass switch
• Switch ON UPS input Mains switch
CAUTION
Ensure the grounding is correctly done. Check to see if the load is safely connected with the output
of the UPS. If the load is not ready to receive power from the UPS, make sure it is safely isolated
from the UPS output terminals
If the Rectifier input is within voltage range, the rectifier will start up in 30 seconds, the inverter will start up
soon after.
• Switch ON UPS Output Switch
If the rectifier fails at start up, the Bypass LED will light up. When the inverter starts up, the UPS will transfer
from bypass mode to inverter mode and then the bypass LED extinguishes and the inverter LED lights up. No
matter whether the UPS can work normally or not, all the status will be shown on the LCD display.
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5.2.2

Test Procedure

CAUTION
It may take 60 seconds to boost up the system and perform self-test completely, if the UPS
is operating normally.
• 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 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.
5.2.3

Maintenance Bypass

To supply the load via mains, you may simply activate 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. Switch to mechanical bypass.
CAUTION
Under normal conditions, the UPS can be controlled through the display, carry out steps
1 to 5; else, jump to step 4.
• When the cover of maintenance switch is opened, the UPS turns to Bypass mode automatically.
• Turn on MAINTENANCE switch
• Open BATTERY breaker
• Switch OFF the MAINS switch
• Switch OFF the BYPASS switch
• Switch OFF OUTPUT switch
At this time the Bypass source will supply to the load through the MAINTENANCE switch.
Switch to normal operation (from mechanical Bypass).
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