Maintenance Bypass" - Mode; Output Switch/Parallel Isolator (Ia2) - ABB PowerWave 33 Series 3 User Manual

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 IA1 Maintenance Bypass switch on the front of the UPS.
POSITION OF IA1
ON
OFF
MAINTENANCE
BYPASS
MAINS
UPS
ON OPERATION MODE "MANUAL BYPASS" THE LOAD IS NOT
PROTECTED AGAINST ANY MAINS FAILURES OR MAINS DISTURBANCES.
NOTE

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)
UPS isolated from Parallel Bus for maintenance or UPS replacement (UPS not
OFF
supplying load)
Modifications reserved
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EFFECT
Bypass-Switch Closed (Load supplied directly from mains)
LCD-indication: "MANUAL BYP IS CLOSED" LED Indicators will indicate
as shown in table below.
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.
LOAD
Bypass Switch
LED Indicator ON
LINE 1 Green
LINE 2 Green
BYPASS Green
INVERTER RED
BATTERY Green
OFF
Green
Green
OFF
Green
Green