Chapter 6 – Parameters
ACH 500 Programming Manual 6-25
5 IR COMPENSATION
This parameter allows extra torque at speeds between 0.1 Hz and the set field
weakening point. This parameter differs from the Torq Boost option of the
Start Function in that it is always valid in the above mentioned speed range.
When using IR Compensation, always set Parameter 20.4.3 (V/Hz Ratio) to
LINEAR.
NO
No compensation wanted.
MANUAL
The user sets the compensation voltage and range (Parameters 20.4.6 and
20.4.7).
AUTOMATIC
The IR-Compensation voltage is automatically controlled as a function of
effective motor current. This setting is suitable when the need for IR
Compensation changes or manual optimization of the compensation voltage is
difficult.
Figure 6-9 shows IR-Compensation applying extra voltage to a motor.
Figure 6-9 IR Compensation
Changing the motor base frequency automatically changes this value if it is
set higher than the motor base frequency.
f [Hz]
d
c
V[V]
b
a
a = IR Comp Voltage
b = IR Comp Range
c = Field Weakening Point
d = Maximum Voltage
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