Motor; Braking Resistor - Siemens SIMATIC ET 200SP F-TM Equipment Manual

Commissioning the
7.7 Messages/monitoring
7.7.1

Motor

Thermal motor monitoring
The thermal motor monitoring is performed using a configurable I²t temperature model.
Thermal motor utilization cannot be immediately determined after initialization
The thermal model is reinitialized after changing the drive data record and when switching
on the device.
After initialization, the thermal motor utilization cannot be immediately determined as the
model must first settle. As a consequence, an initial utilization of 50 % is used as basis. The
settling phase duration depends on the given thermal time constants; the accuracy
depends on to what extent the specific installation situation deviates from the model.
During the settling time it is possible that the set alarm and/or fault threshold is reached
with some delay. For the installation situation simulated in the model, a comparatively
unfavorable installation was selected so that generally deviations occur on the safe side.
You can define the warning threshold under Parameters > Messages/monitoring > Motor
relative to the respective shutdown threshold.
Procedure
1. Open the "Motor" area in the context of the drive under "Parameters" >
"Messages/monitoring".
2. Configure the warning threshold p0291[1].
Motor I²t model
The I
motor current (p0305) as reference value, only requires the thermal time constant winding -
environment (p0611[0]) to calculate the limiting integral. The 100 % shutdown threshold
corresponds to the maximum continuous power loss of the motor, i.e. to the square of the
nominal motor current (p0305).
7.7.2

Braking resistor

Thermal monitoring of braking resistor
The braking resistor is monitored via a temperature model. You can specify the warning
threshold (p0291[2]) relative to the shutdown threshold "Braking resistance maximum
temperature" (p6023).
Procedure
1. Open the "Braking resistor" area in the context of the drive under "Parameters"" >
"Messages/monitoring".
2. Configure the warning threshold p0291[2].
76
WARNING
t monitoring operates with the relative motor power loss, and in addition to the nominal
2
Equipment Manual, 02/2020, A5E47579503-AA
F-TM ServoDrive