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Check first when you have a trouble
6.5.12 Speed does not accelerate
Check
points
Pr. 1, Pr. 2, Pr. 18 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 function 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 P/+ and
circuit
P1 or between terminal P1 and PR by mistake.
6.5.13 Unable to write parameter setting
Check
points
Input
Operation is being performed (signal STF or STR is
ON).
signal
You are attempting to set the parameter in the Network
operation mode.
Parameter
Parameter is disabled by the Pr. 77 Parameter write
setting
selection setting.
Key lock is activated by the Pr. 161 Frequency setting/key
lock operation selection setting.
250
Possible Cause
Possible Cause
Countermeasures
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.
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, MYS
type, FR-ABR) between terminal P/+ 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.
Refer
to
page
124
113
126
128
—
120
—
146
203
26
Refer
to
page
196
196
196
224
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