Troubleshooting
Check first when you have troubles
FR-D700 SC EC
7 - 29
7.6.12
Speed does not accelerate
Check points Possible Cause
Countermeasures
Refer to
Page
Input signal
Start command and frequency command
are chattering.
Check if the start command and the fre-
quency command are correct.
—
The wiring length used for analog fre-
quency command is too long, and it is
causing a voltage (current) drop.
Perform analog input bias/gain calibration.
Input signal lines are affected by external
EMI.
Take countermeasures against EMI, such
as using shielded wires for input signal
lines.
Parameter
Setting
Pr. 1, Pr. 2, Pr. 18, calibration parameter
C2 to C7 settings are improper.
Check the settings of Pr. 1 "Maximum fre-
quency" 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.
Torque boost (Pr. 0, Pr. 46) setting is
improper under V/f control, so the stall
prevention function is activated.
Increase/decrease Pr. 0 "Torque boost"
setting value by 0.5% increments so that
stall prevention does not occur.
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 fre-
quency voltage" to set the base voltage
(e.g. rated motor voltage).
Change Pr. 14 "Load pattern selection"
according to the load characteristic.
Stall prevention is activated due to a heavy
load.
Reduce the load weight.
—
Set Pr. 22 "Stall prevention operation
level" higher according to the load. (Set-
ting Pr. 22 too large may result in frequent
overcurrent trip (E.OC
).)
Check the capacities of the inverter and
the motor.
—
Auto tuning is not performed under Gen-
eral-purpose magnetic flux vector control.
Perform offline auto tuning.
During PID control, output frequency is automatically controlled to make measured
value = set point.
Main Circuit
Brake resistor is connected between ter-
minal P/+ and P1 by mistake.
Connect an optional brake transistor (FR-
ABR) between terminal P/+ and PR.
Содержание FR-D720S SC EC
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Страница 24: ...Description of the case Product checking and part identification 1 4 ...
Страница 108: ...Operation panel Operation 4 20 ...
Страница 436: ...Setting for the parameter unit and operation panel Parameter 6 286 ...
Страница 484: ...Measurements on the main circuit Maintenance and inspection 8 14 ...
Страница 504: ...Specification change Appendix A 20 ...
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Страница 510: ...Index Appendix A 24 ...
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