GE Industrial Solutions AF-600 FP Apogee_FLN - Manual (Page 12)

3 Drive Network Strategies
The drive has its own internal PID closed loop controller. This can be turned on or off, depending on the requirements of the control strategy. A brief summary of
possibilities follows. This is meant to illustrate possibilities rather than be all-inclusive. An actual application may combine features from a more than one of these
strategies.
3.1.1 Strategy One
FLN Function – Monitor drive operation
Drive Control – From a conventional, hardwired system
Drive Mode – Open Loop.
The drive follows hard-wired run/stop signals. An external, hard-wired PID controller provides the drive with a speed reference signal. The FLN monitors the
operation of the drive without control function.
Network Inputs to the drive:
Because the FLN is simply monitoring the operation of the drive, it provides no inputs.
Network Outputs from the drive:
The following points are monitored by the FLN to indicate system status. This list could be expanded or shortened, depending on the requirements of the system.
03 FREQ OUTPUT
08 POWER 10 KWH
23 STOP.RUN
92 OK.FAULT
3.1.2 Strategy Two
FLN Function – Control all aspects of frequency converter operation
Drive Control – From FLN
Drive Mode – Open Loop
The frequency converter follows run/stop and speed reference signals from the FLN. The FLN receives the feedback signal from the controlled system, compares
this to a set-point value, and uses its own PID control loop to determine the required drive speed.
Network Inputs to the frequency converter:
The following drive points might be controlled by the FLN.
Speed Command:
53 BUS REF This is the speed reference command. This is set as a percentage of the drive’s reference range, determined by par. F-52 Minimum
Reference and par. F-53 Maximum Reference. Setting point 53 to 0 gives the drive a reference command equal to the value stored in
par. F-53 Maximum Reference. Setting point 53 to 16384 gives the drive a reference command equal to the value stored in par.
F-53 Maximum Reference. Intermediate values for point 53 change the reference linearly between these two values.
NB!
In general, any other reference signal is added to the bus reference. Disable all other drive reference inputs when using a bus reference to control drive speed.
Start/Stop Command:
To give a start command from the FLN, the following points must be set. The frequency converter can also respond to discrete run/stop control signals that are
hard wired to its control terminals. The point used to stop the Drive through the FLN determines the capability of these discrete command signals.
AF-600 FP Apogee FLN Operating Instructions
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