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PCS100 UPS-I User Manual
5.1.8
Auxiliary Master Module
The Auxiliary Master Module controls the overall system operation from a
central point. It controls all inverters and coordinates the actions of the
Utility Disconnect and the Fail-Safe Bypass. It also provides communication
functionality to the PCS100 UPS-I's GDM and external serial networks.
Additionally, the Auxiliary Master Module includes:
A 26.5Vdc auxiliary power supply for the control electronics.
–
A 230Vac auxiliary power supply for the inverter module fans.
–
Auxiliary power supply protection and distribution for up to 6
inverter modules.
IO module for external control and monitoring purposes.
–
Control and monitoring wiring is explained in Section 13.2.
5.1.9
Auxiliary Slave Module
The Auxiliary Slave Module is the same as the Auxiliary Master Module except it does not contain the control logic
or associated PCBs and I/O terminals. It contains just the auxiliary power supplies, protection and distribution to
the slave inverter enclosure for up to six inverter modules. One Auxiliary Slave is required per slave inverter
enclosure. Note the 26.5 Vdc supplies developed by each Auxiliary Module are not commoned between enclosures.
5.1.10
Fail-Safe Bypass
The Fail-Safe Bypass provides an additional level of security by providing an alternative current path in the event
of an expected or unexpected PCS100 UPS-I shutdown.
The Fail-Safe Bypass is a highly automated and coordinated option which provides a degree of extra security
against a PCS100 UPS-I failure.
Note: The ABB Fail-Safe Bypass does not isolate the PCS100 UPS-I for maintenance or service works.
ABB recommend installation of a maintenance bypass for this purpose.
5.1.11
Intergrated Fail-Safe Bypass
The PCS100 UPS-I with 900 A Utility Disconnect have an integrated Fail-Safe Bypass inside the Utility Disconnect
module in the form of normally closed contactors.
5.1.12
Optional Fail-Safe Bypass
For a PCS100 UPS-I with a Utility Disconnect rated at
2200 A or 4200 A, the Fail-Safe Bypass is optional and
supplied in own enclosure.
If a Fail-Safe Bypass is fitted, the main utility and load
terminals are contained within the Fail-Safe Bypass
enclosure.
If the PCS100 UPS-I system is fitted with optional Fail-
Safe Bypass the type code of the unit includes +FSx
where x is:
2 for system with 2200 A Utility Disconnect
–
4 for system with 4200 A Utility Disconnect
–
The main switching element of the Fail-Safe Bypass
consists of an ABB Emax switch-disconnector.
The ABB Emax switch-disconnectors are derived from
the corresponding ABB Emax air circuit-breaker. The
switch-disconnector differs only by of the absence of
the protection trip units.
Figure 5-9: Auxiliary Master Module
Figure 5-10: 2200 A and 4200 A Fail-Safe Bypass
Enclosure
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