Section-4
04-3004_S4_OPM_ABB_POWERSCALE_10-50kVA_EN_150113.doc Page 8/8 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 rear of the UPS:
see Section 2,chapter 2.2
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.
Before transferring the load to Maintenance Bypass (IA1) always make sure all the UPS-modules are in
the "Bypass-Mode” or “ECO-Mode”.
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.
Normal Operation (Load supplied by UPS)
UPS is isolated from Parallel Bus for maintenance or module replacement (UPS is not
supplying load)
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