Advanced commissioning
6.6 Protection functions
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
271
Thermal motor model 3 for encoderless synchronous motors
The thermal motor model 3 for encoderless synchronous motors 1FK7 or 1FG1 is a thermal
3-mass model, consisting of stator core, stator winding and rotor.
Image 6-44 Thermal motor model 3 for 1FK7 encoderless synchronous motors
Table 6- 38 Thermal motor model 3 for 1FK7 encoderless synchronous motors
CO: Thermal motor load [%]
CO: Actual speed value [rpm]
CO: Actual current value [A]
p0610
Motor overtemperature response (factory setting: 12)
No response, alarm only, no reduction of I
max
max
Messages, no reduction of I
max
Messages, no reduction of I
max
p0612
After selecting an encoderless syn-
chronous motor 1FK7 or 1FG1 (p0300)
or a listed induction motor (p0301)
during the commissioning, the inverter
sets thermal motor model 3 and the
parameters to values appropriate for
the motor type.
The parameters are write-protected for
listed motors (p0301 ≥ 0).
.02 1 signal: Activate motor temperature
model 3 for 1FK7 or 1FG1 encoderless
p5390
Mot_temp_mod 1/3 alarm threshold
(factory
setting: 110.0° C)
Motor temperature > p5390 ⇒ alarm A07012.
p5391
Mot_temp_mod 1/3 fault threshold
(factory
setting: 120.0° C)
Motor temperature > p5391
or
motor temperature > p5390, longer than a mo-
tor-dependent time calculated by the inverter
p0613
Mot_temp_mod 1/3 ambient air temperature
(factory setting: 20° C)
Expected motor ambient temperature in °C for motor operation.
p0625
Motor ambient temperature during commissioning
(factory setting: 20° C)
Motor ambient temperature in °C at the instant of the motor data identification.
Mot_temp_mod stator winding temperature [°C]
Further information is provided in the function charts 8016 and 8017 of the List Manual.
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