KEB COMBIVERT F5-A, Applications Manual, Page: 193 / 552

Motor data and controller adjustments of the asynchronous motor
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.5 - 31
7
7.5.2.4.3 Model adaption
Some auxilliary functions can be activated via the parameter dS.18.
Adjustment of this parameter is not necessary and should only be carried out by authorised KEB service per-
sonnel.
Value 4 is an exception: Model deactivation (see "ASCL model deactivation during deceleration" / subsection
"reversal"). This chapter can therefore be skipped and reading continued in 7.5.2.4.4 "parametrisation of the
speed estimation control".
dS.18 Function mode
Bit Meaning Value Explanation
0
Current offset/
Adaption 0: off
1: on
activates a permanent current offset adjustment
1
Stator resistance/
adaption 0: off
2: on activates setpoint tracing of the stator resistance, which may
change during operation due to temperature effects
2 Model switch-off
0: activated
4: deactiva-
ted Switching in the frequency controlled, current regulated operati-
on during stopping
3 Current control
0: measured
8: calculated Selection of the actual value source of the current controller: 0:
measured current 8: current calculated from the model
4
Observer /
Motor model 0: off
6: on
Activation of an observer for high frequency applications
5 reserved
6
Voltage output for HF
applications 0: off
64: on Activation of a faster voltage output. Only important for high
frequency applications
7 reserved
8 reserved
9
10
Estimation limit
0: off
512:
1024:
1536: Estimation limit off
Estimation limit depending on the speed setpoint
Estimation limit via oP.14/oP.15 to zero
reserved
11 isdq mean
value filter
0: off
2048: on
Current offset / adaption
In some cases, the one-time current offset measurement (either with modulation switched off or via test signals
during motor identification) is insufficient since operation-dependent effects (like temperature) are not consi
-
dered. With this "residual offset", a vibration is created with a frequency equal to the output frequency. The
current offset adaption can reduce this effect.
Attention: Is the simple vibration not caused by the current offset, the adaption is behaving incorrectly. There-
fore, this function must be activated with caution, or only to prove a current offset existence and to utilise its
value.
Stator resistance/ adaption
The stator resistance can stabilise the model at low output frequencies, particularly in generatoric operation.
At low motor rating, the effect of the stator resistance in this range is quite large. Due to the motor warming,
changes of up to 40% compared to the resistance calibrated in the cold state are possible. The stator resistance
adaption can compensate for this change.
Under certain operating conditions, (e.g., high dynamic) the adaption diminishes the operational performance
of the drive. Therefore, this function should only be activated when problems with breaking and stopping may
occur for motors with small power (< 5 kW).