Section-4
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4.1.4.3 "MAINTENANCE BYPASS" - Mode
The Maintenance Bypass Mode is performed by means of the IA1 BYPASS SWITCH on the rear 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 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 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)
!
MAINS
LOAD
MAINTENANCE
BYPASS
UPS
