Page 7.5 - 8 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Motor data and controller adjustments of the asynchronous motor
Torque compensation
Torque compensation adapts the voltage at variable load torques in such a way that the magnetizing current is
kept constant. With it a higher maximum torque is achieved at small output frequencies compared to uncom-
pensated operation (block diagram see chapter 7.5.3.).
7.5.1.7.1 Motor name plate
Following parameters can be taken directly from the name plate and entered:
- dr.00 DASM rated current
- dr.01 DASM rated speed
- dr.02 DASM rated voltage
- dr.03 DASM rated power
- dr.04 TPIM cos (phi)
- dr.05 DASM rated frequency
!! Parameter dr.00 and dr.02 must be adjusted according to the used connection (star/delta).
The following parameters can be taken from the corresponding data sheet or can be determined from measure-
ments:
- dr.06 DASM stator resistance
- dr.09 breakdown factor
7.5.1.7.2 Determination of the stator resistance (dr.06)
The stator resistance can either be measured with an ohmmeter or determined automatically.
In this way the ohmic line resistance is registered simultaneously (important in the case of long incoming lines).
For the measurement with an ohmmeter, the connection between motor and inverter has to be broken. The
measurement is carried out on a warm motor, between 2 phases of the motor feed cable, independent of the
motor wiring (Δ / Y). For a more accurate result, all 3 values (U/V, U/W and V/W) should be measured and the
values then be averaged.
The automatic determination can be carried out for each parameter set separately. Thus a parameter set can
be programmed for example as "Warm-up set" for particularly critical applications.
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