68 Planning the electrical installation
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.
Considering the PELV on installation sites above 2000
meters (6562 feet)
WARNING! Do not use a voltage greater than 48 V for the relay outputs of the
drive module at installation sites above 2000 meters (6562 feet). Use of a voltage
greater than 48 V may damage the drive and cause equipment malfunction and
can cause physical injury. The Protective Extra Low Voltage
(PELV) requirements are not
fulfilled if a relay output is used with a voltage greater than 48 V.
24 VDC
230 VAC
230 VAC
Relay output
Varistor
RC filter
Diode
Relay output
Relay output
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