Group 35: Motor Temp Meas
This group defines the detection and reporting for a particular
potential fault – motor overheating, as detected by a
temperature sensor. Typical connections are defined below.
Figure 20: One Sensor Connection
Figure 21: Three Sensor Connection
WARNING
IEC 60664 requires double or reinforced insulation between
live parts and the surface of accessible parts of electrical
equipment which are either non-conductive or conductive but
not connected to the protective earth .
To fulfill the insulation requirement, connect a thermistor (and
other similar components) to the drive’s control terminals using
any of these alternatives:
• Separate the thermistor from live parts of the motor with
double reinforced insulation .
• Protect all circuits connected to the drive’s digital and
analog inputs . Protect against contact, and insulate from
other low voltage circuits with basic insulation (rated for
the same voltage level as the drive’s main circuit) .
• Use an external thermistor relay . The relay insulation
must be rated for the same voltage level as the drive’s
main circuit .
The figure below shows alternate thermistor connections.
At the motor end the cable shield should be earthed through
a 10 nF capacitor . If this is not possible, leave the shield
unconnected .
Figure 22: Alternate Thermistor Connections
For other faults, or for anticipating motor overheating using a
model, see Group 30: Fault Functions,
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