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Parameter 108
Motor Magnetization Current is the current required to maintain the
magnetic field in the motor. Magnetization Current is factory set based
on the motor power entered in parameter 103. This current value can
also be found by running the motor without anything connected to the
shaft and recording the current. Data charts in motor catalogs also
contain this information.
Parameter 109
Start voltage is factory set based on the motor power entered in
parameter 103. In most cases the factory setting is sufficient; however,
a slight increase in start voltage may be required for high inertia loads.
High current at low speeds results in an increased voltage drop in the
motor and hence the need for additional start voltage.
If multiple motors are connected to a single unit, it is usually necessary
to increase the start voltage. Smaller motors have greater voltage
drops at low frequencies so additional start voltage is usually required.
It is also possible to have start voltage set too high and result in start-
up trouble. The best rule of thumb is to start at the factory setting and
make changes in small increments. Start and stop the unit to test the
results.
Parameter 110
Start compensation; In higher horsepower ranges the need for start
compensation is usually unnecessary. The factory setting is (0) zero.
Changes can be made, however, if the load/motor combination does
not require it, Instability or start-up difficulty will be the result.
Parameter 209
Current limit; Current limit is factory set based on the motor size and
voltage selected. Current limit settings which are too low may result in
difficulty starting or premature trips.
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