HEIDENHAIN iTNC 530 Service Manual page 677

The following graphics illustrate these parameters in relation to the reference current.
Basics
Remember here that CC 422 and CC 424(B) may have different parameters.
For the CC 422, no difference is made between F-DC and F-AC. Instead, F-AC is used as a rigid
limit frequency for the transition between standstill and traversing mode.
With the CC 424 (B) it is possible to use an interpolated current range for the transition from
standstill to traverse. This allows a more exact calculation of the temperature model.
If there is no stall torque value given in the motor table, the following model of current (with
respect to the rated current) is used to calculate the temperature in the motor. The factors for
MP 2302.x and MP 2304.x are not yet taken into account.
I rated
If the stall current value is given in the motor table, the following model of current (with respect
to the stall current) is used to calculate the temperature in the motor. This is only used for
synchronous motors, however. For asynchronous motors the above model of current applies,
which is used if no stall current is given. For synchronous motors, the factors from MP 2302.x
and MP 2304.x are not yet taken into account in the following description.
Io [%]
I rated
July 2010
100
70,7
F-DC
100
70,7
F-DC
Limit frequency by interpolation with CC 424(B)
Direct transition with CC 422 (F-AC)
Rated speed
F-AC
Direct transition with CC 422 (F-AC)
Limit frequency by interpolation with CC 424(B)
Rated speed
F-AC
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