Modifications reserved Page 43/86
OPM_SGS_USM_M40_M50_1US_V020.doc Operating Manual SG Series 400 & 500 kVA
7.1.2 Maintenance shutdown (Load on Q2)
Initial status:
Load supplied from Inverter.
1. Press “inverter off” ( O ) key and hold until
the LED inside the Inverter symbol turns
OFF.
• Load is transferred to Utility.
• Inverter shuts down.
• LED Inverter must be OFF.
The LCD screen must display the status “LOAD ON BYPASS”.
2. Close Q2 (Pos. I).
• Load is now supplied parallel through
Bypass and Q2.
• LED for Manual Bypass lights up.
3. Open Q1 (Pos. O) and then press “total off”
button.
• Load is now supplied from Manual
Bypass.
• Rectifier shuts down and all output and
input contactors are opened.
• Press mute, to reset alarm and buzzer.
The LCD panel must display the main screen, indicating the status “LOAD OFF”.
4. Disconnect the Battery from the UPS (only for UPS configuration without external
Battery Breaker Release).
• Wait 5 minutes for DC-Link Capacitors to discharge.
Before you proceed with any kind of
intervention on the UPS, make sure the
DC-Link voltage be less than 15 VDC.
Ub=15V
Ib= + 0A
Battery Temp= + 20
°
C
Charge Level= 87%
Autonomy = 12min
metering
alarms
parameters
+
–
ok
END OF PROCEDURE
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