ABB DPA 250 S4 - 4.5 Maintenance Bypass

30 DPA 250 S4 50-250 KW OPERATING MANUAL
The Maintenance Bypass Mode is performed by means of the Q1 MANUAL BYPASS SWITCH.
POSITION OF SWITCH EFFECT
ON Bypass-Switch Closed (Load supplied directly from bypass mains)
—
4.5-1
POSITION OF SWITCH EFFECT
OFF 
(Load supplied by inverter)
—
4.5-2
—
4.5 Maintenance bypass
—
4.5.1: “Maintenance
bypass switch closed”
operating mode
NOTE
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
—
4.5.2: “Maintenance
bypass switch opened”
operating mode