ABB ACQ550-U1-011A-6, User Manual

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122 ACQ550-U1 User’s Manual
Parameters
2606 SWITCHING FREQ
Sets the switching frequency for the drive. Also see parameter 2607
SWITCH FREQ CTRL
and section Switching
frequency derating on page 270 .
• Higher switching frequencies mean less noise.
• 12 kHz switching frequency is available in scalar control mode, that is when parameter 9904
MOTOR CTRL MODE
= 3
(
SCALAR
:
FREQ
).
• See the availability of switching frequencies for different drive types in the table below.
2607 SWITCH FREQ CTRL
The switching frequency may be reduced if the ACQ550
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 =
OFF
– The function is disabled.
1 =
ON
– The switching frequency is limited according to
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
MOTOR CTRL MODE
= 3 (
SCALAR
:
FREQ
).
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
SWITCHING FREQ
. This parameter has no effect if parameter 2606 = 12 kHz.
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 =
DISABLE
– Disables DC stabilizer.
1 =
ENABLE
– Enables DC stabilizer.
2625 OVERMODULATION
Enables or disables overmodulation. Disabling overmodulation can help in some applications in field weakening
area.
0 =
DISABLE
– Disables overmodulation (default).
1 =
ENABLE
– Enables overmodulation.
2627 FLUX STAB GAIN
Adjusts the flux stabilizer gain for scalar control.
2628 DC STAB GAIN
Adjusts the DC voltage stabilization.
Code Description
1, 2, 4 and 8 kHz 12 kHz
208…240 V All types Frame sizes R1…R4 in scalar control mode
380…480 V All types Frame sizes R1…R4 (except ACQ550-01-097A-4) in scalar control mode
500…600 V All types Frame sizes R2…R4 in scalar control mode
80 °C 100 °C
4 kHz
12 kHz
8 kHz
90 °C
f
sw
limit
T
R1…R4 drives, see par 2606
R5…R6 drives, see par 2606
Drive
temperature