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ENCODER FEEDBACK CONTROL—A500(L)
(3) Instructions for encoder feedback control.
1) The number of motor poles used must be checked before starting operation. The number of poles
set must be correct to ensure proper control of the motor.
2) The encoder should be coupled in line with the motor shaft without any mechanical looseness with
a speed ratio of 1 to 1.
3) Make sure that the encoder has been set to the correct rotation direction on the rotation direction
display of the parameter unit. If the rotation direction is not correct, encoder feedback control cannot
be carried out (the inverter can be operated).
4) During acceleration or deceleration, encoder feedback control is not performed to prevent instability
such as hunting. Encoder feedback control is started after the output frequency has once reached
the [set speed] ± [speed feedback range].
5) If any of the following conditions occurs during encoder feedback control operation, the inverter is run at the
output frequency of [set speed] ± [speed feedback range] without coming to an alarm stop and does not
follow up the motor speed:
• The pulse signal from the encoder is switched off due to an open cable, etc.
• An accurate pulse signal cannot be detected due to induction noise, etc.
• The motor is forced to accelerate (regenerative operation) or decelerate (e.g. motor lock) by large
external force.
6) When opening the brake of the motor with brake, use the RUN (running) signal. (The brake may not
be opened if the FU (output frequency detection) signal is used.)
7) During encoder feedback control, do not switch off the 5V power of the encoder. If the power is
switched off, normal encoder feedback control cannot be exercised.
8) Programmed operation cannot be performed in the encoder feedback control mode (when the FR-
A5AP is fitted).
9) Set Pr. 285 "overspeed detection frequency" to prevent misoperation caused if an accurate signal
cannot be detected from the encoder. This shuts off the output and gives an inverter alarm (E.MB
1) when; (detection frequency) - (output frequency) > Pr. 285.
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