MITSUBISHI ELECTRIC FR-S520E - Manual (Page 180)

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Troubleshooting
3.2 Troubleshooting
POINTS
If the cause is still unknown after every check, it is recommended to initialize the
parameters (return to factory setting) then re-set the required parameter values and
check again.
3.2.1 Motor remains stopped
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.
2) Check the input signals
Check that the start signal is input.
Check that both the forward and reverse rotation start signals are not
input simultaneously.
Check that the frequency setting signal is not zero.
Check that the AU signal is on when the frequency setting signal is 4 to
20mA.
Check that the output stop signal (MRS) or reset signal (RES) is not on.
(Assign signals MRS and RES using Pr. 60 to Pr. 63 (input terminal
function selection).)
Check that the sink or source jumper connector is fitted securely.
3) Check the parameter settings
Check that the reverse rotation prevention (Pr. 78) is not selected.
Check that the operation mode (Pr. 79) setting is correct.
Check that the bias and gain (C2 to C7) settings are correct.
Check that the starting frequency (Pr. 13) setting is not greater than the
running frequency.
Check that various operational functions (such as three-speed operation),
especially the maximum frequency (Pr. 1), are not zero.
4) Check the load
Check that the load is not too heavy.
Check that the shaft is not locked.
5) Others
Check that the operation panel display does not show an error (e.g. OC1).
Check that the Pr. 15 "jog frequency" setting is not lower than the Pr. 13
"starting frequency" value.