Set constant d5-01 to “0” (speed control).
Set one of the constants from H1-01 through H1-06 (multi-function inputs) to “71” (speed/torque
control change).
If the Slip Compensation Function Has Low Speed Precision
The slip compensation limit has been reached.With the slip compensation function, compensation cannot
be carried out beyond the slip compensation limit set in constant C3-03. Check to be sure that the
set value is suitable.
If There is Low Speed Control Accuracy at High-speed Rotation in Open-loop
Vector Control Mode
The motor’s rated voltage is high.
The Inverter’s maximum output voltage is determined by its input voltage. (For example, if 200 VACis input, then the
maximum output voltage will be 200VAC.) If, as a result of vector control, the output
voltage reference value exceeds the Inverter output voltagemaximumvalue, the speed control accuracywill decrease.
Set C3-06 to 1, or, alternatively use a motor with a low rated voltage (i.e., a special motorfor use with vector control),
or change to flux vector control.
If Motor Deceleration is Slow
The deceleration time is long even when braking resistor is connected.
“Stall prevention during deceleration enabled” is set.
When braking resistor is connected, set constant L3-04 (stall prevention selection during deceleration)
to “0” (disabled) or “3” (deceleration stall prevention with braking resistor). Whenthis constant is set to
“1” (enabled, the factory-set default), braking resistor does not fully function.
The deceleration time setting is too long.
Check the deceleration time setting (constants C1-02, C1-04, C1-06, and C1-08).
Motor torque is insufficient.
If the constants are correct and there is no overvoltage fault, then the motor’s power is limited. Consider
increasing the motor capacity.
The torque limit has been reached.
Whena torque limit has been set in constants L7-01 to L7-04, no torque will be output beyond that limit.
This can cause the deceleration time to be too long. Check to be sure that the value set for the torque limit
is suitable.
If the torque limit has been set by multi-function analog inputs H3-05 and H3-09 (set value: 10 to 13),
check to be sure that the analog input value is suitable.
If the Vertical-axis Load Drops When Brake is Applied
The sequence is incorrect.
The Inverter goes intoDCinjection braking status for 0.5 seconds after deceleration is completed. (This
is the factory-set default.)
Toensurethatthebrakeholds, setfrequencydetection2(H2-01=5) for the multi-function contactoutput
terminals (9-10) so that the contacts will OPENwhen the output frequency is greater than L4-01 (3.0 to
5.0 Hz). (The contacts will close below L4-01.)
There is hysteresis in frequency detection 2 (L4-02 = 2.0 Hz) . Change the setting to approximately
0.5 Hz if there are drops during stop.Donot use the “running” signal (H2-01 = 0) for the brake ON/OFF
signal.
If the Motor Overheats
The load is too big.
If the motor load is too heavy and the motor is used with the effective torque exceeding the motor’s rated
torque, the motor will overheat. Some motor rating are given for short period performance and are not
continuousratings.Reducetheloadamountbyeither lightening theload orlengthening the acceleration/
deceleration time. Also consider increasing the motor capacity.
The motor rating is determined within a particular ambient operating temperature range. The motor will
burn out if it is run continuously at the rated torque in an environment in which the maximum ambient
operating temperature isexceeded.Lowerthemotor’sambienttemperatureto within the acceptableambient
operating temperature range.
The ambient temperature is too high.
The withstand voltage between the motor phases is insufficient.
When the motor is connected to the Inverter output, a surge is generated between the Inverter switching
andthemotorcoil.Normallythemaximumsurgevoltage is three timesthe Inverter’s inputpowersupply
voltage (i.e., 1,200Vfor 400Vclass).Besure to use a motor with a withstand voltage between the motor
phases that is greater than the maximum surge voltage. In particular, when using a 400Vclass Inverter,
use a special motor for Inverters.
Autotuning has not been performed for vector control
Vector control will not perform if autotuning has not been performed. Perform autotuning separately
for the motor, or set the motor constants through calculations. Alternatively, change the control mode
selection (A1-02) to V/f control.
If There is Noise When the Inverter is Started or From an AM Radio
If noise is generated by Inverter switching, implement the following countermeasures:
Lower the Inverter’s carrier frequency (constant C6-01). This will help to some extent by reducing
the amount of internal switching.
Install an Input Noise Filter at the Inverter’s power supply input area.
Install an Output Noise Filter at the Inverter’s power supply output area.
Use metal tubing. Electric waves can be shielded by metal, so encase the Inverter with metal (steel).
Ground the Inverter and motor.
Separate main circuit wiring from control wiring.
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