968 HEIDENHAIN Technical Manual MANUALplus 620
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_motFactorI2t and MP_ampFactorI2t are not yet taken into account in the
following description.
Commissioning and
evaluation
Enter in MP_motFactorI2t the factor for the I
2
t monitoring of the motor.
The input value is a factor for the reference current (1 = 100% of the motor’s
standstill current or rated current). If you enter zero, the I
2
t monitoring for
the motor (not for the power module) is switched off.
Enter in MP_ampFactorI2t the factor for the I
2
t monitoring of the power
module. The input value is a factor of the power module’s rated current (1 =
100%). If you enter zero, the I
2
t monitoring for the power module (not for
the motor) is switched off.
All required entries for calculation of a temperature model have to be
available in the motor table or power module table (see "Temperature
models" on page 973).
Use Module 9160 (recommended) or Module 9367 to interrogate the I
2
t
monitoring (see "Module 9160 Status request of temperature monitoring
and I2t monitoring" on page 971).
F-AC
F-DC
Io [%]
100
70.7
n
Rated speed
I rated
Direct transition with CC 422 (F-AC)
Threshold from interpolation with CC 61xx
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