1PH7 induction motors (Machine tools)
Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0
189
Motor components (options)
5
5.1 5.1 Thermal motor protection
A temperature-dependent resistor is integrated as temperature sensor to monitor the motor
temperature.
The sensor is evaluated in the converter whose closed-loop control takes into account the
temperature characteristic of the motor winding. When a fault occurs, an appropriate
message is output at the converter. When the motor temperature increases, a message
"Alarm motor overtemperature" is output; this must be externally evaluated. If this message
is ignored, the converter shuts down with the appropriate fault message after a preset time
period or when the motor limiting temperature or the shutdown temperature is exceeded.
WARNING
Sufficient protection is no longer provided for thermally critical load situations, e.g. for a
high overload condition at motor standstill. In this case, other protective measures must be
provided, e.g. a thermal overcurrent relay. The "thermal motor model i2t monitoring"
function must be activated in the converter.
The temperature sensor is part of a SELV circuit, which can be destroyed if a high voltage is
applied. The temperature sensor is designed so that the DIN/EN requirement for "protective
separation" is fulfilled.
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