Parameter listing and descriptions
239
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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