Maintenance Bypass - ABB DPA 250 S4 Operating Manual

30 D PA 2 5 0 S 4 5 0 - 2 5 0 K W O P E R AT I N G M A N U A L
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4.5 Maintenance bypass

The Maintenance Bypass Mode is performed by means of the Q1 MANUAL BYPASS SWITCH.
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4.5.1: "Maintenance
bypass switch closed"
operating mode
POSITION OF SWITCH
ON
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4.5.2: "Maintenance
bypass switch opened"
operating mode
POSITION OF SWITCH
OFF
NOTE
EFFECT
Bypass-Switch Closed (Load supplied directly from bypass mains)
EFFECT
Bypass-Switch Open – Normal operating condition
(Load supplied by inverter)
TO HAVE TO MOST ESSENTIAL SECURITY
LEVEL, WE RECOMMEND TO RUN THE UPS
ON NORMAL OPERATION MODE, MEANS
UPS MODE (MODE "ON-LINE")
Once the critical load is feed by the bypass mains,
the UPS module can be isolated for maintenance
or testing
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4.5-1
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4.5-2