Siemens 611 configurationmanual Evaluation of the temperature sensors for motor protection, Method

Motor components of the built-in motor and options 3.2 Thermal motor protection

3.2.2Evaluation of the temperature sensors for motor protection

Temp–S

Temp–S is used to reliably protect the motor against overheating. If Temp–S responds, then the drive must be quickly shut down in order to prevent the drive converter from continuing to supply current to the stator (= additional thermal load). The current load level setpoint(s), requested from the closed-loop control, causes this thermal load and this can destroy the stator.

There are two possibilities of evaluating Temp–S:

Method 1

The SME9x module is evaluated via the drive converter. In this case, only PTC 130 °C is evaluated. An internal logic circuit of the SME9x module causes the drive converter to switch the drive into a no-current condition if the overtemperature or fault continues (max. 2 seconds).

Note

Please observe the following when parameterizing the machine data:

∙MD1607 (shutdown limit, motor temperature) must be 155 °; i.e. it is not permissible that this parameter is changed.

∙MD1602 (pre-alarm threshold) and MD1603 (timer, motor temperature alarm) can be adapted depending on the specific application. However, MD1602 (pre-alarm threshold) should not be greater than the shutdown temperature of the PTC temperature sensor.

Method 2

Evaluation via the PLC and connection via the thermistor motor protection device:

●Only one PTC is evaluated e.g. if the drive system only has one evaluation channel. In this case, PTC 130 °C must be evaluated. The drive control reaction time may not exceed 1 second, from the response of the PTC element (Temp-S) to the disconnection of the power supply (pulse inhibit in the drive control).

●Both PTCs are evaluated:

In this particular case, the PTC 130 °C is used to output an alarm message. If the temperature continues to increase, then the PTC 150 °C responds when its response temperature is reached; after this, the stator must be immediately brought into a no- current condition.

For the parameterization, please contact your local Siemens office.

48	1FW6 Built-in torque motors
	Configuration Manual, 05/2009, 6SN1197-0AD00-0BP7