44 Basic application
If the routine is interrupted by a power loss or alarm then the routine is aborted and the old parameter values
are left intact. This also occurs after a time out of 2 minutes, which indicates that the load inductance/supply
relationship was outside its range of safe operation. In this case you must enter the current loop terms
manually. See 6.8.9 CURRENT C ONTROL / Autotune enable PIN 92.
6) With the RUN terminal T31 lo w, activate the Start control and check the operation of the main contactor.
If there are any drive problems that are detectable by the on board alarms they will be annunciated. Any
alarm conditions must be resolved prior to running. No w take the RUN terminal high to commence
AUTOTUNE. Note if a contactor drop out occurs, then the AUT OTUNE will have to be re-enabled before
commencing.
7) When you have successfully performed a current loop autotune it is time to save these changes.
8) Provided you correctly adjusted the C ALIBRA TIO N parameters, the unit is no w calibrated to run in
armature voltage feedback mode with the motor ratings you entered and the current loop tuned.
9) Activate the Start controls. Slowly increase the speed control potentiometer whilst observing the shaft
rotation. If there are any drive problems that are detectable by the on board alarms they will be annunciated.
Any alarm conditions must be resolved prior to running. Note it may be necessary to reduce the speed loop
gain for smooth running. See 6.7.4 SPEED CONTROL / Speed proportional gain PIN 71.
10) Make use of this quick start mode to check as much of the system as possible prior to further
configuration.
4.5.4 PASSIVE MOT OR defaults / Using passive motor menu for small test motors
The PL/X has the facility to be used with 2 different motors. See 6.1.17 C ALIBRA TIO N / Motor 1 or 2 select
PIN 20. The default values for the passive motor (this is motor 2 from the factory) are set at a level to suit
very small motors. Making these values the active set during a system test with a small motor, will save time
altering and then re-setting the control terms on motor 1.
The dynamic performance of the test motor, (by making the default passive motor settings the active set),
will not be as good as a correctly calibrated motor, but should be sufficient for most purposes.
The parameters that have been set at a different default level for the passive motor are as follo ws.
Paragraph PARAMETER Range Motor 1
Motor 2
PIN
6.1.4 C ALIBRA TIO N / Rated field amps PIN 4 QUICK ST ART 0.1 –100 % A 25% A mps
1 amp
4
6.7.4 SPEED CONTROL / Speed proportional gain PIN 71 0 – 200.00 15.00
5.00
71
6.8.2 CURRENT CONTROL / Current clamp scaler PIN 8 1 0 - 150.0 0 % 150.00%
10.00%
81
6.8.10 CURRENT C O NTROL / Current amp proportional gain PIN 93 0 – 2 00.00 30.00
5.00
93
6.8.11 CURRENT C O NTROL / Current amp integral gain PIN 9 4 0 – 200.00 3.00
1.00
94
6.8.12 CURRENT C O NTROL / Discontinuous current point PIN 95 0 – 200.00% 13.00%
0.00%
95
Note. When using very small unloaded motors on high rated PL/X units the missing pulse alarm may be
activated. This is because the armature current is below the missing pulse detection threshold. To prevent
the alarm from tripping, set 8.1.5 M O TOR DRIVE ALARMS / Missing pulse trip enable PIN 175 to
DISABLED.
See also 13.13.4.1 50 % / 100 % rating select, for details of the burden jumper, which allows selection of a
high value burden resistor for an alternative method of testing the PL/X on small motors.
The passive motor set parameters are the ones used in the REDUCED Menu. The PASSIVE MOTOR SET is
also useful for a rapid revie w of the alterable parameters in the CHA NGE PARA METERS reduced menu, or
setting these parameters for a second system. See 11.1 DISPLA Y FUNCTIONS / Reduced menu enable
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