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TEST RUN PROCEDURE Chap 4
4.9 Running the Inverter for Motor Operation Check
After completion of preparations for a test run as described above, start running the inverter for motor operation check using the following procedure.
If the user configures the function codes wrongly without completely understanding this User's Manual, the motor may rotate with a torque or at a speed not permitted for the machine.
Accident or injury may result.
If any abnormality is found in the inverter or motor, immediately stop operation and investigate the cause referring to Chapter 6 “TROUBLESHOOTING.”
4.9.1 Test run procedure
(1) Turn the power ON and check that the reference frequency *00 Hz is blinking on the LED monitor.
(2) Set a low reference frequency such as 5 Hz, using / keys. (Check that the frequency is blinking on the LED monitor.)
(3) Press the key to start running the motor in the forward direction. (Check that the reference frequency is lit on the LED monitor.)
(4) To stop the motor, press the key.
4.9.2 Check points during a test run
(1) Check that the motor is running in the forward direction.
(2) Check for smooth rotation without motor humming or excessive vibration.
(3) Check for smooth acceleration and deceleration.
When no abnormality is found, press the key again to start driving the motor, then increase the reference frequency using / keys. Check the above points again.
Depending on the settings of function codes, the motor speed may rise to an unexpectedly high and dangerous level, particularly, under vector control with speed sensor. To avoid such an event, the speed limiting function is provided.
If the user is unfamiliar with the function code settings (e.g., when the user starts up the inverter for the first time), it is recommended that the “F15: Frequency limiter (Upper limit)” and the torque control “d32: Speed limit 1” and “d33: Speed limit 2” are used. At the startup of the inverter, to ensure safer operation, specify small values to those function codes at first and gradually increase them while checking the actual operation.
The speed limiting function serves as an overspeed level barrier, or as a speed limiter under torque control. For details of the speed limiting function, refer to Chapter 5.
For driving PMSM under vector control without magnetic pole position sensor, when P30 is set to any value other than “0,” noise that may occur from the motor at the start of running can be regarded as normal.
Depending on the settings of function codes, the motor speed may rise to an unexpectedly high and dangerous level. To avoid such an event, the speed limiting function is provided.
If the user is unfamiliar with the function code settings (e.g., when the user starts up the inverter for the first time), it is recommended that “F15: Frequency limiter (Upper limit)” is used. At the start-up of the inverter, to ensure safer operation, specify a small value to the function code at first and gradually increase it while checking the actual operation.
4.9 Running the Inverter for Motor Operation Check
4.9.3 Modification of motor control function code data
Modifying the current function code data sometimes can solve an insufficient torque or overcurrent or overvoltage incident. Table 4.9-1 lists the major function codes to be accessed. For details, see Chapter 5 “FUNCTION CODES”
and Chapter 6 “TROUBLESHOOTING.”
Table 4.9-1
Function
code Name Modification key points
Drive control IM
V/f IM PG V/f
IM w/
PG f 07 Acceleration time 1
If the current limiter is activated due to a short acceleration time and large drive current, prolong the acceleration time.
Y Y Y
f 08 Deceleration time 1 If an overvoltage trip occurs due to a short
deceleration time, prolong the deceleration time. Y Y Y
f 09 * Torque boost 1
If the starting motor torque is deficient under V/f control mode, increase the torque boost.
If the motor with no load is overexcited (current increasing), decrease the torque boost.
Y Y N
f 44 Current limiter (Mode selection)
If the stall prevention function is activated by the current limiter during acceleration or deceleration, increase the operation level.
Y Y N
p 07 * Motor 1 ( %R1)
If the starting motor torque is insufficient under automatic torque boost and torque vector control, increase %R1. If the motor with no load is over-excited (current increasing), decrease %R1.
Y Y Y
p 09 *
Motor 1
(Slip compensation gain for driving)
For excessive slip compensation during driving, decrease the gain; for insufficient one, increase the gain.
Y N Y
p 11 *
Motor 1
(Slip compensation gain for braking)
For excessive slip compensation during braking, decrease the gain; for insufficient one, increase the gain.
Y N N
h 07 Curve acceleration/
deceleration
If overshoot to the change in speed command is large, make curve acceleration/deceleration speed effective.
Y Y Y
h 69 Anti-regenerative control (Mode selection)
If overvoltage trip occurs when executing
acceleration/deceleration without using the braking resistor, prevent overvoltage trip by making anti-regenerative control effective.
Y Y Y
h 80 *
Output current
fluctuation damping gain for motor 1
It is not necessary to change the setting normally.
If the current vibrates by the stall prevention function due to current limitation or the high speed motor is driven, decrease the suppression gain.
Even though the stall prevention does not function, if the motor vibrates due to current fluctuation, increase the suppression gain.
Y Y N
Y: Modification effective N: Modification ineffective
4.9 Running the Inverter for Motor Operation Check
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TEST RUN PROCEDURE Chap 4
In the case of V/f control with speed sensor, V/f control with speed sensor and auto torque boost, vector control for induction motor with speed sensor, or Vector control for synchronous motor without speed sensor and magnetic pole position sensor, if the problem is not solved by adjusting the function code in Table 4.9-1, adjust the function code in Table 4.9-2.
In the above control methods, PI regulator is used for speed control. The desired response can be obtained by adjusting the control constants (PI constants) to match the load inertia. The major function codes to adjust are shown below.
For details, see Chapter 5 “FUNCTION CODES” and Chapter 6 “TROUBLESHOOTING.”
Table 4.9-2 Function
code Name How to adjust
IM PG V/f IM w/ PG
PM
d 01 Speed control 1 (Speed command filter)
If an excessive overshoot or undershoot occurs for a speed command change, increase the filter constant.
If motor response is slow for a speed command change, decrease the filter constant.
Y
d 02 Speed control 1 (Speed detection filter)
If ripples are superimposed on the speed detection signal so that the speed control gain cannot be increased, increase the filter constant to obtain a larger gain. It is not necessary to change the factory default normally.
Y
d 03 Speed control 1 P (Gain)
If hunting is caused in the motor speed control, decrease the gain. If speed mismatch or excessive speed deviation (ere ) occurs because the motor response is slow, increase gain.
Y
d 04 Speed control 1 I (Integral time)
If speed mismatch or excessive speed deviation (ere ) occurs because the motor response is slower, decrease the integration time.
If the load inertia is large, increase the integration time.
Y