302 Parameters
97
97 Motor control
Motor model settings.
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).
See section Flux braking (page 51).
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
Full Maximum braking power. Almost all available current is used
to convert the mechanical braking energy to thermal energy in
the motor.
2
97.06 Flux reference
select
Defines the source of flux reference.
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
User flux
reference
Zero None. 0
User flux reference Parameter 97.07 User flux reference.1
Other Source selection (see Terms and abbreviations on page 92). -
97.07 User flux reference Defines the flux reference when parameter 97.06 Flux
reference select is set to User flux reference.
100.00%
0.00 … 200.00% User-defined flux reference. 100 = 1%
No. Name/Value Description Def/FbEq16
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