ABB ACH550-01 User Manual page 245

ACH550 User's Manual
Code Description
IR COMP VOLT
Sets the IR compensation voltage used for 0 Hz.
• Requires parameter 9904
• Keep IR compensation as low as possible to prevent overheating.
• Typical IR compensation values are:
380...480 V Units
P (kW)
N
IR comp (V)
• 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.
P 2603
2604 IR COMP FREQ
Sets the frequency at which IR compensation is 0 V (in % of motor
frequency).
2605 U/f RATIO
Selects the form for the U/f (voltage to frequency) ratio below field
weakening point.
1 = – Preferred for constant torque applications.
LINEAR
2 =
SQUARED
( is more silent for most operating frequencies.)
SQUARED
2606 SWITCHING FREQ
Sets the switching frequency for the drive.
• Higher switching frequencies mean less noise.
Note: 12 kHz only for frame sizes R1...R4.
Parameter listing and descriptions
MOTOR CTRL MODE
3 7.5 15
21 18 15
Motor
voltage
A
B
P 2604
– Preferred for centrifugal pump and fan applications.
Range
0...100 V
= 3 (
SCALAR
37 132
10 4
A = IR compensated
B = No compensation
f (Hz)
0...100%
1=LINEAR, 2=SQUARED
1, 4, 8, 12 kHz
: ).
FREQ
233