Protective functions
Check first when you have a trouble
FR-A800
6 - 45
6.6.6
Speed greatly differs from the setting
6.6.7
Acceleration/deceleration is not smooth
Check
points
Possible cause
Countermeasure
Refer to
page
Input
signal
Frequency setting signal is incorrectly input. Measure the input signal level.
⎯
The 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 "Maximum frequency," Pr. 2 "Minimum
frequency", Pr. 18 "High speed maximum
frequency", and calibration parameters C2
to C7 settings are improper.
Check the settings of Pr. 1, Pr. 2, and Pr. 18.
Check the calibration parameters C2 to C7
settings.
Pr. 31 to Pr. 36, Pr. 552 (frequency jump)
settings are improper.
Narrow down the range of frequency jump.
Load
Stall prevention (torque limit) function is
activated due to a heavy load.
Reduce the load weight.
⎯
Parameter
setting
Set Pr. 22 "Stall prevention operation level
(torque limit level)" higher according to the
load. (If Pr. 22 is set too high, an overcurrent trip
(E.OC
첸
) is likely to occur.)
Motor
Check the capacities of the inverter and the
motor.
⎯
Check
points
Possible cause
Countermeasure
Refer to
page
Parameter
setting
Acceleration/deceleration time is too short.
Increase the acceleration/deceleration time.
Torque boost (Pr. 0, Pr. 46, Pr. 112) 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.
The base frequency does not match the
motor characteristics.
Under V/F control, set Pr. 3 "Base frequency",
Pr. 47 "Second V/F (base frequency)", and Pr. 113
"Third V/F (base frequency)".
Under vector control, set Pr. 84 "Rated motor
frequency".
Regeneration avoidance operation is
performed
If the frequency becomes unstable during
regeneration avoidance operation, decrease
the setting of Pr. 886 "Regeneration avoidance
voltage gain".
Load
Stall prevention (torque limit) function is
activated due to a heavy load.
Reduce the load weight.
⎯
Parameter
setting
Set Pr. 22 "Stall prevention operation level
(torque limit level)" higher according to the
load. (If Pr. 22 is set too high, an overcurrent trip
(E.OC
첸
) is likely to occur.)
Motor
Check the capacities of the inverter and the
motor.
⎯
Summary of Contents for FR-A820-00046 (0.4K)
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Page 144: ...System configuration for Ethernet communication FR A800 E Installation and wiring 2 114 ...
Page 202: ...Basic operation procedure JOG operation Basic operation 4 32 ...
Page 1090: ...Check first when you have a trouble Protective functions 6 50 ...
Page 1189: ...Appendix EC Declarations of Conformity FR A800 A 49 ...
Page 1190: ...EC Declarations of Conformity Appendix A 50 ...
Page 1191: ...Appendix EC Declarations of Conformity FR A800 A 51 ...
Page 1192: ...EC Declarations of Conformity Appendix A 52 ...
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Page 1212: ...EC Declarations of Conformity Appendix A 72 A 7 2 FR A846 series ...
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