Atlas Copco QAS 500 Volvo S2A APP, Instruction Manual

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– Mains breaker control lines have to be wired to
X25.13/X25.14/X25.15/X25.16. These terminals
are voltage free contacts. The power for the MB
has to be supplied by the customer (24 Vdc/
230 Vac) (max. contact rating K11, K12 = 250 V/
16 A).
– The Mains sensing lines L1/L2/L3/N have to be
wired to terminals X25.3/X25.4/X25.5/X25.6.
– Make sure the connections between X25.33 &
X25.3; X25.34 & X25.4; X25.35 & X25.5;
X25.36 & X25.6 are removed.
– Power Transducer lines have to be wired to
X25.21 (input) and X25.22 (GND).
– Verify all settings for paralleling set up (see
“Paralleling”).
Multiple gen-sets with load sharing
In this application the units are enabled to share the
active and reactive load equally in percentage of the
nominal power. The load sharing is active when each
gen-set is running in island mode and the generator
breaker is closed.
Multiple gen-sets with power
management (PMS)
PMS (= Power Management System) is a system that
will automatically start & stop generators based on
the actual load dependency. This will be done through
a PMS communication between the different units
connected.
PMS applications are always in combination with
AUTO mode. If the SEMI-AUTO mode is selected,
the PMS operation will NOT function! The
Qc4002™ controllers from the gensets need to be
programmed as PMS in AUTO mode. When a Qc
Mains controller is installed this needs to be
programmed in the application that is required (AMF,
LTO, FP, MPE) and AUTO mode.
Installations are possible with stand-alone generators
or with the Mains (extra Qc4002™ Mains is then
needed). A number of Qc4002™ units are being used
in the power management application, i.e. one for
each mains breaker (Qc4002™ mains controller), if
installed, and one for each generator (Qc4002™
genset controller). All units communicate by means
of an internal CANbus connection.
In an application with PMS it is important to program
correctly the Start & Stop signals between the
different generators because of the following reasons:
– The maximum load step needs to be programmed
in the Qc4002™ controllers. This never may
exceeds the power reserve of the running
generators. Otherwise the gensets will go in
overload with a sudden max. load increase before
the next generator is started up and connected to
the busbar.
– To prevent the gensets to run in a start - stop loop.
By programming the parameters in
AUTO mode, the generator can
start up immediately. It is
recommended to place the generator
in SEMI-AUTO mode while
programming all the PMS
parameters !