
Parameter listing and descriptions 233
ACH550-01 User's Manual
2603 IR COMP VOLT 0…100 V
Sets the IR compensation voltage used for 0 Hz.
• Requires parameter 9904
MOTOR CTRL MODE = 3 (SCALAR:FREQ).
• Keep IR compensation as low as possible to prevent overheating.
• Typical IR compensation values are:
• When enabled, IR compensation provides an extra voltage boost to
the motor at low speeds. Use IR compensation, for example, in
applications that require a high breakaway torque.
2604 IR COMP FREQ 0…100%
Sets the frequency at which IR compensation is 0 V (in % of motor
frequency).
2605 U/F RATIO 1=LINEAR, 2=SQUARED
Selects the form for the U/f (voltage to frequency) ratio below field
weakening point.
1 =
LINEAR – Preferred for constant torque applications.
2 =
SQUARED – Preferred for centrifugal pump and fan applications.
(
SQUARED is more silent for most operating frequencies.)
Code Description Range
380…480 V drives
P
N
(kW) 3 7.5 15 37 132
IR comp (V) 21 18 15 10 4
Motor
f (Hz)
A
B
voltage
A = IR compensated
B = No compensation
P 2603
P 2604
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