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Atlas Copco QAS 250-330 JD T4i - Page 30

Atlas Copco QAS 250-330 JD T4i
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- 30 -
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 1310 3200 12/00 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.
Automatic Mains Failure (AMF) operation
This application is only possible in combination with the
AUTO mode. If the SEMI-AUTO mode is selected the
AMF operation will NOT function!
The unit automatically starts the gen-set and switches to
generator supply at a mains failure after an adjustable
delay time.
AMF no back synchronisation:
When the mains returns, the unit will switch back to mains
supply and cool down and stop the gen-set. The switching
back to mains supply is done without back synchronisation
when the adjusted ‘Mains OK delay’ has expired.
AMF with back synchronisation:
When the mains returns, the unit will synchronise the mains
breaker to the busbar when the ‘Mains OK delay’ has expired.
Then the gen-set cools down and stops.
Installation wirings
The link between X25.10/X25.11 has to be removed.
Mains breaker feedback lines have to be wired to X25.10/
X25.11/X25.12.
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.
If back synchronisation is enabled, all settings for
paralleling set up (see “Paralleling”) must be verified also.
Peak Shaving (PS) operation
This application is normally used in combination with the
AUTO mode. Installation with the Mains.
The generator will start up when the mains imported
power (measured through an optional Power Transducer =
PT) exceeds a defined level. The generator will
synchronise with the bus, and will take load until the
defined allowable mains imported power level is reached.
When the mains imported power decreases below the
defined mains imported power level for a defined time, the
generator will unload and disconnect from the bus. Then
the generator will go into cool down.
Installation wirings
The link between X25.10/X25.11 has to be removed.
Mains breaker feedback lines have to be wired to X25.10/
X25.11/X25.12.
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)XXX
Automatic Mains
Failure (with back
sync.)
X(X)XXX
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
XX XX
Multiple gen-sets,
power management
X(X)XXX

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