July 2013 7.10 Adjustment of linear and torque motors 1125
Temperature
sensor
Linear motors usually have a KTY and several PTC thermistors or
thermoswitches for temperature measurement.
The KTY is monitored by the control (NC). The temperature signal is conducted
to the control together with the encoder signals (X15 to X20). If the KTY is not
to be evaluated, this function must be deactivated over MP2220.x bit 4 = 1
(see "Monitoring functions" on page 1087).
For linear and torque motors, the conductor for the temperature signal of the
KTY is frequently in the motor power cable, which can cause interference.
Since the conductor for the temperature signal is then led into the conductor
of the speed encoder, the interference causes noise in the encoder signals.
HEIDENHAIN therefore recommends conducting the temperature signals
over the line drop compensator, so that the interference signals are filtered.
For example, PTC thermistors can be connected to a PLC input via the
securely grounded 3RN1013-1BW10 thermistor motor-protection device from
SIEMENS.
The PTC thermistors or thermoswitches must be galvanically isolated
and evaluated by the PLC.
The KTY requires double insulation to the motor windings, which must be
provided by the motor manufacturer. Otherwise, do not connect the KTY
to the control!
HEIDENHAIN recommends the additional temperature monitoring of the
PTC thermistors or thermoswitches via the PLC, since these are distributed
over the entire length (linear motors) or circumference (torque motors) (as
opposed to the KTY, for which there are only spot measurements).
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