Vicruns 2S-0.4G-B, Руководство пользователя, Страница: 264 / 300

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Chapter 9 Troubleshooting and Countermeasures
9.3 Common faults of synchronous motors and their solutions
If the motor does not start normally with load, you can try the following operations:
9.3.1 Motor starts with heavy load
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Increase the upper limit of torque current (P3-21)
When the load is greater than the torque output of the inverter, the inverter will be
in a locked-rotor state, and P3-21 can be appropriately increased at this time.

Increase the speed PI adjustment parameter, modify the resistance value or
static identification to correct the motor resistance.
The motor resistance parameter (P4-17) will significantly affect the load carrying
capacity of the motor at low speed. When the resistance parameter (P4-17) exc
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eeds the actual resistance value by too much (for example, 200% of the actual
resistance value), it may cause the motor to reverse at low speed at the upper
torque limit current. When the resistance parameter (P4-17) is too much lower
than the actual resistance value (for example, 50% of the actual resistance valu
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e), it may cause the motor to run in a step-by-step manner, or rotate for a period
of time and stop for a period of time. Increasing the speed P value P3-04 at low
speed and reducing the speed loop integral time P3-05 may improve the problem
caused by too small resistance parameters.
In general, if the proportional coefficient of speed PI adjustment is too large, it
Œ
will cause high-frequency vibration of the speed, and the mechanical vibration
or electromagnetic noise will increase significantly; if the proportional coeffici
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ent is too small and the integration time is too small or the load inertia is too
large, it will cause low-frequency vibration of the speed and overshoot of the
speed. Obviously, if there is no discharge measures, there may be overvoltage.
If you need to adjust the speed PI parameter, first increase the integral time,

increase the ratio if the speed does not oscillate, and then decrease the integral
time if the effect is not satisfactory. Generally, the larger the inertia of the syste
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m, the smaller the integral time and the larger the proportional coefficient. If the
speed filter coefficient is increased, the integral time should be increased, and
the proportion can be increased appropriately.
9.3.2 Adjust the speed loop PI parameters (under normal circumstances do not
need to adjust)
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