Check First When You Have Troubles; Motor Does Not Rotate As Commanded - Mitsubishi Electric FR-A700 Instruction Manual

Troubleshooting
7.6

Check first when you have troubles

7.6.1

Motor does not rotate as commanded

● Check the Pr. 0 "Torque boost". (Refer to section 6.2.1.)
● Check the main circuit.
– Check that a proper power supply voltage is applied (operation panel display is provided).
– Check that the motor is connected properly.
– Check that the jumper across P/+-P1 is connected.
● Check the input signals.
– Check that the start signal is input.
– Check that both the forward and reverse rotation start signals are not input simultane-
ously.
– Check that the frequency setting signal is not zero. (When the frequency command is
0Hz and the start command is entered, FWD or REV LED on the operation panel flickers.)
– Check that the AU signal is on when the frequency setting signal is 0 to 20mA.
– Check that the output stop signal (MRS) or reset signal (RES) is not on.
– Check that the CS signal is not OFF with automatic restart after instantaneous power
failure function is selected (Pr. 57 ≠ 9999).
– Check that the sink or source jumper connector is fitted securely.
– Check that the encoder wiring is correct.
● Check the parameter settings.
– Check that the reverse rotation prevention selection (Pr. 78) is not selected.
– Check that the operation mode selection (Pr. 79) setting is correct.
– Check that the bias and gain (calibration parameter C2 to C7) settings are correct.
– Check that the starting frequency (Pr. 13) setting is not greater than the running
frequency.
– Check that frequency settings of each running frequency (such as multi-speed operation)
are not zero.
– Check that especially the maximum frequency (Pr.1) is not zero.
– Check that the Pr. 15 "Jog frequency setting" is not lower than the Pr. 13 "Starting
frequency" value.
– Check that the Pr. 359 "Encoder rotation direction" setting under encoder feed back
control or vector control is correct. Set "1" in Pr. 359 if "REV" on the operation panel is
on when the forward command is given.
● Inspection of load.
– Check that the load is not too heavy.
– Check that the shaft is not locked.
FR-A700 EC
Check first when you have troubles
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