60 ACS 300 User’s Manual
Chapter 7 - Drive Parameters
• Press and hold the key for three seconds.
• The ACS 300 will respond by updating the frequency set-
ting to the current value. The CRIT f1H is now set.
Repeat the procedure for the second critical frequency
range if necessary. To erase the critical frequencies, set
both to 0 Hz.
IR COMP
This parameter allows extra torque at speeds between 0.1
Hz and the nominal motor speed. The parameter differs
from the AUTO BOOST option of the START parameter in
that it is always valid in the 0.1 Hz to nominal motor speed
range.
Keep the compensation voltage as low as possible for the
application, as the motor will overheat rapidly or an overcur-
rent fault may occur if a high level of compensation is
applied.
Small motors can take higher compensation than larger
motors because the winding resistance is higher in small
motors. If the motor must drive a load with a high starting
torque, we recommend using AUTO BOOST starting. If you
have trouble with motor overheating, use a motor with more
poles and run at a higher frequency.
If the IR compensation is set too high, the motor can “satu-
rate” and will not rotate at all, but will draw current.
OFF
No compensation wanted.
0.1 - 60 V
The compensation voltage given by the user.
AUTO
The compensation voltage is automatically given to maintain
or reduce current accordingly.
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