Auto Tune - GE AF-650 GP Design Manual

- Par. B-24 Stop Delay. Allows successive starting without applying the mechanical brake. (e.g. reversing)
- Par. B-25 Brake Release Time. The time needed by the brake to be open/closed.
In closed loop structure, the parameter dependency is:
- Par. E-24 Function Relay andpar. E-26 On Delay, Relay
- Par. F-25 Start Function: Hoist Mechanical Brake
- Par. B-25 Brake Release Time
- Par. B-26 Torque Ref. Sets the torque to be applied against the closed mechanical brake before release.
- Par. B-27 Torque Ramp Time
- Par. B-28 Gain Boost Factor. Compensates the "push back" when the speed controller takes over the torque controller.

8.1.9 Auto Tune

Auto tune is an algorithm to measure the electrical motor parameters on a motor at standstill. This means that ato tune itself does not supply any torque.
Auto tune is useful when commissioning systems and optimising the adjustment of the frequency converter to the applied motor. This feature is particularly used
where the default setting does not apply to the connected motor.
Par. P-04 Auto Tune allows a choice of complete auto tune with determination of all electrical motor parameters or reduced auto tune with determination of the
stator resistance Rs only.
The duration of a total auto tune varies from a few minutes on small motors to more than 15 minutes on large motors.
Limitations and preconditions:
• For the auto tune to determine the motor parameters optimally, enter the correct motor nameplate data in P-07, P-02, F-05, F-04, P-03, P-06.
• For the best adjustment of the frequency converter, carry out auto tune on a cold motor. Repeated auto tune runs may lead to a heating of the motor,
which results in an increase of the stator resistance, Rs. Normally, this is not critical.
• Auto tune can only be carried out if the rated motor current is minimum 35% of the rated output current of the frequency converter. Auto tune can be
carried out on up to one oversize motor.
• It is possible to carry out a reduced auto tune test with a Sine-wave filter installed. Avoid carrying out a complete auto tune with a Sine-wave filter. If an
overall setting is required, remove the Sine-wave filter while running a total auto tune. After completion of the auto tune, reinsert the Sine-wave filter.
• If motors are coupled in parallel, use only reduced auto tune if any.
• Avoid running a complete auto tune when using synchronous motors. If synchronous motors are applied, run a reduced auto tune and manually set
the extended motor data. The auto tune function does not apply to permanent magnet motors.
• The frequency converter does not produce motor torque during an auto tune. During an auto tune, it is imperative that the application does not force
the motor shaft to run, which is known to happen with e.g. wind milling in ventilation systems. This disturbs the auto tune function.
8.1.10 Logic Controller Programming
In applications where a PLC is generating a simple sequence the Logic Controller may take over elementary tasks from the main control.
Logic Controller is designed to act from event sent to or generated in the frequency converter. The frequency converter will then perform the pre-programmed
action.
AF-650 GP Design Guide
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