592
6. PROTECTIVE FUNCTIONS
6.5 Check first when you have a trouble
6.5.12 Speed does not accelerate
Check
points
Possible cause Countermeasure Refer to
page
Input signal Start command and frequency command are
chattering.
Check if the start command and the frequency command are
correct.
―
The wiring length used for analog frequency
command is too long, and it is causing a
voltage (current) drop.
Perform Analog input bias/gain calibration. 328
The input signal lines are affected by external
EMI.
Take countermeasures against EMI, such as using shielded
wires for input signal lines.
73
Parameter
setting
Pr.1 Maximum frequency, Pr.2 Minimum
frequency, Pr.18 High speed maximum
frequency, and Pr.902 to Pr.905 settings are
improper.
Check the settings of Pr.1 and Pr.2 and set Pr.18. 253
Check the Pr.902 to Pr.905 settings. 328
The maximum voltage (current) input value is
not set during the External operation. (Pr.125,
Pr.126, Pr.18)
Check the settings of Pr.125 Terminal 2 frequency setting
gain frequency and Pr.126 Terminal 4 frequency setting
gain frequency.
To operate at 120 Hz or higher, set Pr.18 High speed
maximum frequency.
253, 328
Torque boost (Pr.0, Pr.46) setting is improper
under V/F control, so the stall prevention
function is activated.
Increase/decrease the Pr.0 Torque boost setting value by
0.5% increments so that stall prevention does not occur.
538
V/F pattern is improper when V/F control is
performed.
(Pr.3, Pr.14, Pr.19)
Set rated frequency of the motor to Pr.3 Base frequency.
Use Pr.19 Base frequency voltage to set the base voltage (for
example, rated motor voltage).
539
Change Pr.14 Load pattern selection according to the load
characteristic.
541
Stall prevention function is activated due to a
heavy load.
Reduce the load weight. ―
Set Pr.22 Stall prevention operation level higher according to
the load. (If Pr.22 is set too high, an overcurrent trip (E.OC[]) is
likely to occur.)
257
Check the capacities of the inverter and the motor. ―
Auto tuning is not performed under Advanced
magnetic flux vector control.
Perform offline auto tuning. 353
The setting of pulse train input is improper. Check the specification of the pulse generator (open collector
output or complementary output) and check the adjustment of
the pulse train and frequency (Pr.385 F
requency for zero
input pulse and Pr.386 Frequency for maximum input
pulse).
222
During PID control, output frequency is automatically controlled to make measured value = set point. 396
To Next Page
Loading...
Need help?
General
