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Instructions - Mitsubishi Electric FR-A5AP Instruction Manual

Transistorized inverter.
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(1) The encoder should be coupled with the spindle oriented without any mechanical looseness.
(2) The DC injection brake operated for positioning must be released in the shortest time (within several
seconds). Operating the brake continuously can cause the motor to generate heat and burn out.
(3) To ensure correct positioning, the encoder must be set in the proper rotation direction and the A and B
phases connected correctly.
(4) Orientation may not be completed if the pulse signals are not received from the encoder during
orientation due to a break in the cable or the like.
(5) When orientation control is exercised, orientation cannot be completed if "no DC injection brake
operation" is set in the DC injection brake adjusting (voltage, frequency, speed, time) parameters.
These parameters must be set to operate the DC injection brake.
(6) To terminate orientation, the start signal (STF or STR) must be first switched off and the orientation
signal (X22) must be switched off. As soon as this orientation signal is switched off, orientation control
(7) For orientation control, set correct values in Pr. 350 "stop position command selection" and Pr. 360 "12-
bit data selection" (external position command selection).
If the values set are incorrect, proper orientation control will not be performed.
(8) If "8888" (DC injection external selection) is set in Pr. 11 "DC injection brake operation time", the DC
injection brake is not operated unless the X13 terminal signal is switched on. For orientation control,
the DC injection brake is operated independently of the X13 signal.
(9) When orientation control is exercised, PID control is invalid.


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