Atlas Copco QAS 275-325, Instruction Manual

Page: 49 / 114

- 49 -
Diagnostics menu
This diagnostics menu can be entered via channel
6700. This menu is used for engine diagnostics
situations.
If diagnostics is selected in this menu, the fuel
solenoid relay output will be de-energized for 30
seconds (to make sure that the unit is completely
stopped), and then gets energized again. Then engine
diagnostics can take place.
To leave this status, disable diagnostics in channel
6700, or press stop, or start the machine (not during
the first 30 s).
Standard applications
In the Qc4002™ module 9 application types can be
selected. A combination of each application type with
the running mode results in a specific application.
Depending on the application the user has to connect
extra wirings to terminal blocks X25. These terminal
blocks can be found inside the control box on a DIN-
rail. We refer to the circuit diagram 9822 0993 28/05
for the correct connections.
Island operation
This application is possible in combination with
SEMI-AUTO mode or AUTO mode. The internal real
time clock timer can only be used in AUTO
This operation type is selected for installations with
one or more generators, but always without the Mains
(= stand-alone). In practice up to 16 generators can be
installed in parallel.
Installation wirings
– Terminals X25.10/X25.11 have to be linked. The
module always needs a feedback signal from the
Mains Breaker MB. In Island mode there is no
MB in the system. In this case the MB opened
signal is simulated with this link.
– The busbar sensing lines have to be wired to the
corresponding control module inputs. Place
bridge between:
• X25.33 (L1) => X25.3
• X25.34 (L2) => X25.4
• X25.35 (L3) => X25.5
• X25.36 (N) => X25.6
(The busbar = power cables between GB and load)
– For Remote Start operation:
• wire the RS switch between X25.9 & X25.10.
– For Paralleling applications with other generators:
• See “Paralleling” to set up generator for
paralleling.
It's only possible to start the
generator when Normal is selected.
Gen-set mode Running mode
Auto Semi Test Man Block
Automatic Mains
Failure (no back sync.) X (X) X X X
Automatic Mains
Failure (with back
sync.) X (X) X X X
Island operation X X X X
Fixed power/base load X X X X X
Peak shaving X X X X X
Load take over X X X X X
Mains power export X X X X X
Multiple gen-sets, load
sharing X X X X
Multiple gen-sets,
power management X (X) X X X