6.4.3 "Maintenance bypass" - mode
Before transferring the load to Maintenance Bypass (IA1) always make sure all the UPS-modules are in
the "Bypass-Mode” or “ECO-Mode”. The Maintenance Bypass mode is performed by closing (put in
position ON) the
switch on the front of the UPS.
POSITION OF IA1 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.
ON OPERATION MODE “MANUAL BYPASS“ THE LOAD IS NOT
PROTECTED AGAINST ANY MAINS FAILURES OR MAINS DISTURBANCES.
6.4.4 Output switch/parallel isolator (ia2)
Every UPS-unit is provided with an output parallel isolator (IA2) which, when opened isolates the
corresponding unit from the PARALLEL BUS and from the LOAD. Once IA2 is open there is no power
on the load coming from the UPS.
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 isolated from Parallel Bus for maintenance or UPS replacement (UPS not
supplying load)
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