ABB ACQ580, Firmware Manual

Page: 292 / 422

288 Parameters
4 kHz 4 kHz. 4
8 kHz 8 kHz. 8
97.02 Minimum switching
frequency Lowest switching frequency value that is allowed. Depends
on the frame size.
When drive is reaching the thermal limit, it will automatically
start to reduce the switching frequency until the minimum
allowed value is reached. Once the minimum has been
reached, the drive will automatically start limiting the output
current to keep the temperature below the thermal limit.
Inverter temperature is shown by parameter
05.11 Inverter
temperature .
2 kHz
2 kHz 2 kHz. 2
4 kHz 4 kHz. 4
8 kHz 8 kHz. 8
97.03 Slip gain Defines the slip gain which is used to improve the estimated
motor slip. 100% means full slip gain; 0% means no slip gain.
The default value is 100%. Other values can be used if a
static speed error is detected despite having the setting at full
slip gain.
Example (with nominal load and nominal slip of 40 rpm): A
1000 rpm constant speed reference is given to the drive.
Despite having full slip gain (= 100%), a manual tachometer
measurement from the motor axis gives a speed value of 998
rpm. The static speed error is 1000 rpm - 998 rpm = 2 rpm. To
compensate the error, the slip gain should be increased to
105% (2 rpm / 40 rpm = 5%).
100%
0…200% Slip gain. 1 = 1%
97.04 Voltage reserve Defines the minimum allowed voltage reserve. When the
voltage reserve has decreased to the set value, the drive
enters the field weakening area.
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
If the intermediate circuit DC voltage
U
dc
= 550 V and the
voltage reserve is 5%, the RMS value of the maximum output
voltage in steady-state operation is
0.95 × 550 V / sqrt(2) = 369 V
The dynamic performance of the motor control in the field
weakening area can be improved by increasing the voltage
reserve value, but the drive enters the field weakening area
earlier.
-2%
-4…50% Voltage reserve. 1 = 1%
97.05 Flux braking Defines the level of flux braking power. (Other stopping and
braking modes can be configured in parameter group
21
Start/stop mode ).
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
Disabled
Disabled Flux braking is disabled. 0
Moderate Flux level is limited during the braking. Deceleration time is
longer compared to full braking. 1
No. Name/Value Description Def/FbEq16