Speed Does Not Accelerate; Unable To Write Parameter Setting - Mitsubishi Electric FR-E700 Instruction Manual

5.5.12 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.
Torque boost (Pr. 0, Pr. 46) setting is improper under V/F
control, so the stall prevention function is activated.
V/F pattern is improper when V/F control is performed.
(Pr. 3, Pr. 14, Pr. 19)
Parameter
Setting
Stall prevention is activated due to a heavy load.
Auto tuning is not performed under Advanced magnetic
flux vector control or General-purpose magnetic flux
vector control.
During PID control, output frequency is automatically controlled to make measured value = set point.
Main
Brake resistor is connected between terminal + and P1
Circuit or between terminal P1 and PR by mistake.

5.5.13 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
Parameter
selection setting.
Setting
Key lock is activated by the Pr. 161 Frequency setting/key
lock operation selection setting.
Operation mode and a writing device do not
correspond.
Possible Cause
Possible Cause
Check first when you have some troubles
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.
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.
Use Pr. 19 Base frequency voltage to set the base voltage
(e.g. rated motor voltage).
Change Pr. 14 Load pattern selection according to the load
characteristic.
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.
Perform offline auto tuning.
Connect an optional brake transistor (MRS type, FR-
ABR) between terminal + and PR.
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.
Refer
to
page
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170
38
88
170
77
90
92
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84
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112
232
29
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to
page
178
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5
182,
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