72 ACS 300 User’s Manual
Chapter 7 - Drive Parameters
When both reference and output frequency drop below 1.5 Hz,
the ACS 300 will stop generating sinusoidal current and inject DC
into the motor. When the reference frequency rises above 1.5 Hz,
the DC will be removed and normal ACS 300 function resumed.
DC Hold has no effect if the Start signal is deactivated.
Note:
Injecting DC current into the motor causes the motor to
heat up. In applications where long DC Hold times are required,
externally ventilated motors should be used. DC Hold cannot
keep the motor shaft totally from rotating if a load torque is
applied to the motor.
PARAM SET
Selecting extended I/O configuration. When you want to use
page 4 parameters, parameter PSET must be set to “2” and DI5
must be active.
1
Page 4 parameters ignored.
2
Page 4 parameters are used if DI5 is active.
PI-GAIN
This parameter defines the gain of PI Controller. The setting
range is 0 to 800 %. If the value is 0 %, the PI Controller is
inactive. Changing of PI-GAIN from 0 is possible only when start
is inactive. The following table shows how the output frequency
changes to a 10 % change in error and a 50 % change in error
with different gain selections.
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