ABB ACS550 User Manual page 138

138
Code Description
2606 SWITCHING FREQ
Sets the switching frequency for the drive. Also see parameter 2607
frequency derating
• Higher switching frequencies mean less noise.
• The 1, 4 and 8 kHz switching frequencies are available for all types, except for ACS550-01-246A-4 only 1 and
4 kHz are available.
• The 12 kHz switching frequency is available only if parameter 9904
• The 12 kHz switching frequency is available for 200 V and 400 V frame sizes R1...R4 (except for the R4 types
ACS550-01-087A-4 and ACS550-U1-097A-4) and for 600 V frame sizes R2...R4.
2607 SWITCH FREQ CTRL
The switching frequency may be reduced if the ACS550
internal temperature rises above a limit. See the figure.
This function allows the highest possible switching
frequency to be used based on operating conditions.
Higher switching frequency results in lower acoustic
noise.
0 = – The function is disabled.
OFF
1 = – The switching frequency is limited according to
ON
the figure.
2608 SLIP COMP RATIO
Sets gain for slip compensation (in %).
• A squirrel-cage motor slips under load. Increasing the frequency as the motor torque increases compensates for
the slip.
• Requires parameter 9904
0 – No slip compensation.
1...200 – Increasing slip compensation. 100% means full slip compensation.
2609 NOISE SMOOTHING
This parameter introduces a random component to the switching frequency. Noise smoothing distributes the acoustic
motor noise over a range of frequencies instead of a single tonal frequency resulting in lower peak noise intensity.
The random component has an average of 0 Hz. It is added to the switching frequency set by parameter 2606
. This parameter has no effect if parameter 2606 = 12 kHz.
SWITCHING FREQ
0 =
DISABLE
1 = .
ENABLE
2619 DC STABILIZER
Enables or disables the DC voltage stabilizer. The DC stabilizer is used in scalar control mode to prevent possible
voltage oscillations in the drive DC bus caused by motor load or weak supply network. In case of voltage variation the
drive tunes the frequency reference to stabilize the DC bus voltage and therefore the load torque oscillation.
0 = – Disables DC stabilizer.
DISABLE
1 = – Enables DC stabilizer.
ENABLE
Parameters
on page 262.
MOTOR CTRL MODE
SWITCH FREQ CTRL
MOTOR CTRL MODE
f
sw
limit
12 kHz
8 kHz
4 kHz
80 °C
= 3 ( : ).
SCALAR FREQ
ACS550 User's Manual
and section Switching
= 3 ( : ).
SCALAR FREQ
R1...R4 drives, see par 2606
R5...R6 drives, see par 2606
Drive
temperature
T
90 °C 100 °C