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Speed Does Not Accelerate; Unable To Write Parameter Setting; Power Lamp Is Not Lit - Mitsubishi Electric FR-F720P-0.75K Instruction Manual

Fr-f700p series.
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Check first when you have a trouble

6.6.12 Speed does not accelerate

Check
points
Start command and frequency command are chattering.
Input
The wiring length used for analog frequency command
signal
is too long, and it is causing a voltage (current) drop.
Input signal lines are affected by external EMI.
Pr. 1, Pr. 2, Pr. 18, calibration parameter C2 to C7 settings
are improper.
The maximum voltage (current) input value is not set
during the external operation. (Pr.125, Pr.126, Pr.18)
Torque boost (Pr. 0, Pr. 46) setting is improper under V/F
control, so the stall prevention function is activated.
Parameter
Setting
V/F pattern is improper when V/F control or Simple
magnetic flux vector control is performed.
(Pr. 3, Pr. 14, Pr. 19)
Stall prevention function is activated due to a heavy
load.
During PID control, output frequency is automatically controlled to make measured value = set point.

6.6.13 Unable to write parameter setting

Check
points
Input
Operation is being performed (signal STF or STR is
signal
ON).
You are attempting to set the parameter in the External
operation mode.
Parameter is disabled by the Pr. 77 Parameter write
selection setting.
Parameter
Key lock is activated by the Pr. 161 Frequency setting/key
lock operation selection setting.
Setting
Operation mode and a writing device do not
correspond.
Attempted to set "25" in Pr.72 PWM frequency selection
under IPM motor control. Attempted to perform IPM
motor control while Pr.72 ="25."

6.6.14 Power lamp is not lit

Check
points
Main
Circuit,
Wiring or installation is improper.
Control
Circuit
140
Possible Cause
Possible Cause
Possible Cause
Countermeasures
Check if the start command and the frequency
command are correct.
Perform analog input bias/gain calibration.
Take countermeasures against EMI, such as using
shielded wires for input signal lines.
Check the settings of Pr. 1 Maximum frequency and Pr. 2
Minimum frequency. If you want to run the motor at 120Hz
or higher, set Pr. 18 High speed maximum frequency.
Check the calibration parameter C2 to C7 settings.
During IPM motor control, maximum frequency is limited to
the maximum motor speed (frequency) of the IPM motor.
Check the Pr.125 Terminal 2 frequency setting gain
frequency and Pr.126 Terminal 4 frequency setting gain
frequency settings. To operate at 120Hz or higher, set
Pr.18 High speed maximum frequency.
Increase/decrease Pr. 0 Torque boost setting value by
0.5% increments so that stall prevention does not occur.
Set rated frequency of the motor to Pr. 3 Base frequency.
(V/F control, Simple magnetic flux vector control)
Use Pr. 19 Base frequency voltage to set the base voltage
(e.g. rated motor voltage). (V/F control, Simple magnetic
flux vector control)
Change Pr. 14 Load pattern selection according to the load
characteristic. (V/F control)
Reduce the load weight.
Set Pr. 22 Stall prevention operation level higher according
to the load. (Setting Pr. 22 too large may result in
frequent overcurrent trip (E.OC ).)
Check the capacities of the inverter and the motor.
Countermeasures
Stop the operation.
When Pr. 77 = "0" (initial value), write is enabled only
during a stop.
Choose the PU operation mode.
Or, set Pr. 77 = "2" to enable parameter write regardless
of the operation mode.
Check Pr. 77 Parameter write selection setting.
Check Pr. 161 Frequency setting/key lock operation selection
setting.
Check Pr. 79, Pr. 338, Pr. 339, Pr. 550, Pr. 551, and select
an operation mode suitable for the purpose.
Pr.72 cannot be set to "25" during the IPM motor control.
(The sine wave filter (MT-BSL/BSC) cannot be used
under IPM motor control.)
Countermeasures
Check for the wiring and the installation.
Power lamp is lit when power supply is input to the
control circuit (R1/L11, S1/L21).
Refer
to
page
87
100
164
60
73
87
89
90
Refer
to
page
97
97
97
104
78, 109
96
Refer
to
page
11

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