Siemens SIDOOR AT40 System Manual page 42

Mean power dissipation of the motor
The mean motor power dissipation is continuously calculated. This is a measurement for the
thermal load of the motor. If the mean motor power dissipation exceeds the permissible
motor power dissipation, the motor is overloaded or overheated.
Possible causes for an excessive mean motor power dissipation:
● Motor is undersized.
● Increased friction of the travel distance
● In the case of frequent drive cycle number
● Oscillation in the door end positions
After a power failure, the calculation of the average motor power dissipation starts again at
zero. This means that a previous load on the motor is not taken into account.
The time constant for calculating the mean motor power dissipation depends on the motor
type and ranges from 0.5 to 2 hours.
Application example:
The average power dissipation of the motor can be queried cyclically (cycle times in the
range of minutes) and evaluated over a longer period of time (hours).
The measured average power dissipation of the motor can be compared with a reference
value. If a permissible tolerance is exceeded, this can indicate an overloading of the motor.
Current motor power
● Current electric motor input power.
● Current mechanical motor output power
● Current motor power dissipation.
The current power values of the motor can be queried for diagnostic purposes.
The values correspond to the power values at the time of query.
Application example:
The current power values can be queried cyclically or at specific times to determine the
motor power in specific operating states.
Door control units SIDOOR AT40 and ATD400V for elevators
System Manual, 06/2018, A5E42192709-AC
SIDOOR functions
3.3 Extended functions
41