Siemens SIMATIC ET 200pro Original Instructions Manual page 133

Inverter response to thermal overload
Parameter Description
r0036
r0037
p0290
p0292
p0294
Overload response for p0290 = 0
The inverter responds depending on the control mode that has been set:
● In vector control, the inverter reduces the output current.
● In U/f control, the inverter reduces the speed.
Once the overload condition has been removed, the inverter re-enables the output current or
speed.
If the measure cannot prevent an inverter thermal overload, then the inverter switches off the
motor with fault F30024.
Overload response for p0290 = 1
The inverter immediately switches off the motor with fault F30024.
Overload response for p0290 = 2
We recommend this setting for drives with square-law torque characteristic, e.g. fans.
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 04/2015, FW V4.7.3, A5E34257324B AB
Power unit overload I t [%]
2
The I t monitoring calculates the inverter utilization based on a current reference value
2
defined in the factory.
Actual current > reference value: r0036 becomes higher.
•
Actual current < reference value: r0036 becomes lower or remains = 0.
•
Power unit temperatures [°C]
Power unit overload response
Factory setting and the ability to be changed depends on the hardware. The dependency
is described in the List Manual.
A thermal overload is present if the inverter temperature is greater than that specified in
p0292.
You define how the inverter responds if there is a risk of thermal overload using this
parameter. The details are described below.
Power unit temperature warning threshold (factory setting: Heat sink [0] 5 °C, power
semiconductor [1] 15 °C)
The value is set as a difference to the shutdown temperature.
Power unit warning at I2t overload (factory setting: 95 %)
Setting functions
8.6 Protection and monitoring functions
133