ACS 400 User’s Manual 93
Group 26: Motor Control
Figure 33 Operation of IR compensation
Code Description
2603 IR COMPENSATION
IR compensation voltage at 0 Hz.
Note! IR compensation should be
kept as low as possible to prevent
overheating. Refer to Table 10.
Table 10 Typical IR compensation values.
2604 IR COMP RANGE
IR compensation range. Defines frequency after which IR compensation is 0 V.
2605 LOW NOISE
Motor acoustical noise option.
0 =
OFF
Standard (switching frequency 4 kHz).
1 =
ON(1)
Low noise (switching frequency 8 kHz).
Note! When the low noise setting is used, the maximum loadability of the ACS 400 is I
2
at 30 °C ambient
temperature or 0.8 * I
2
at 40 °C.
2606 U/f RATIO
U/f ratio below field weakening point.
1 =
LINEAR
2 = SQUARE
Linear is preferred for constant torque applications, Square for centrifugal pump and fan applications.
(Square is more silent for most operating frequencies.)
2607 SLIP COMP RATIO
A squirrel-cage motor will slip under load. The slip can be compensated by increasing the frequency as the
motor torque increases. This parameter defines the gain for the slip. 100 % means full slip compensation;
0 % means no slip compensation.
400 V Units
P
N
/ kW 3 7.5 15 22 37
IR comp / V 21 18 15 12 10
IR compensation
No compensation
Field
f (Hz)
U
N
U (%)
IR compensation range
weakening
point
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