Section-4
04-3008_S4_ABB_OPMCPDPA-S2_GB_121202 Page 9/10 ABB
Printed in Switzerland – Modifications reserved
4.1.4.3 "MAINTENANCE BYPASS" - Mode
The Maintenance Bypass Mode is performed by means of the IA1 BYPASS SWITCH on the front of the UPS:
POSITION OF
SWITCH
EFFECT
ON Bypass-Switch Closed (Load supplied directly from mains)
LCD-indication: “MANUAL BYP IS CLOSED” LED Indicators will indicate
as shown in table below.
OFF
Bypass-Switch Open – Normal operating condition
(Load supplied by inverter)
LCD-indication “MANUAL BYP IS OPEN”
LED Indicators will indicate as shown in table below.
LED Indicator ON OFF
LINE 1 Green Green
LINE 2 Green Green
BYPASS Green OFF
INVERTER RED Green
BATTERY Green Green
Before transferring the load to Maintenance Bypass (IA1) always make sure all the UPS-modules are in
the "Bypass-Mode” or “ECO-Mode”.
NOTE!
ON OPERATION MODE „MANUAL BYPASS“ THE LOAD IS NOT
PROTECTED AGAINST ANY MAINS FAILURES OR MAINS
DISTURBANCES.
4.1.4.4 Parallel Isolator (IA2)
Every UPS-unit (module) is provided with an output parallel isolator (IA2) which, when opened isolates the
corresponding unit (module) from the PARALLEL BUS and from the LOAD. Once IA2 is open there is no power
coming from its inverter.
In redundant parallel configurations it is used to isolate a unit from the parallel system without the need of
transferring the load to bypass.
POSITION EFFECT
ON Normal Operation (Load supplied by UPS)
OFF
UPS-Module isolated from Parallel Bus for maintenance or module
replacement (UPS-Module not supplying load)
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