Planning the electrical installation
76
Install the protective component as close to the inductive load as possible. Do not
install protective components at the relay outputs.
Connecting a motor temperature sensor to the drive I/O
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 fulfil this requirement, the connection of a thermistor (and other similar
components) to the digital inputs of the drive can be implemented in three alternate
ways:
1. There is double or reinforced insulation between the thermistor and live parts of
the motor.
2. Circuits connected to all digital and analogue inputs of the drive are protected
against contact and insulated with basic insulation (the same voltage level as the
drive main circuit) from other low voltage circuits.
3. An external thermistor relay is used. The insulation of the relay must be rated for
the same voltage level as the main circuit of the drive. For connection, see
Firmware Manual.
Example circuit diagram
See page 136.
24 VDC
230 VAC
230 VAC
Relay output
Varistor
RC filter
Diode
Relay output
Relay output
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