2. If there is basic insulation between the sensor and the live parts of the motor, you
can connect the sensor to the analog/digital inputs of the drive if all circuits connected
to the drive’s digital and analog inputs (typically extra-low voltage circuits) are
protected against contact and insulated with basic insulation from other low-voltage
circuits. The insulation must be rated for the same voltage level as the drive main
circuit. Note that extra-low voltage circuits (such as 24 V DC) typically do not meet
these requirements.
3. You can connect the sensor to the drive via an option module.The sensor and the
module must form a double or reinforced insulation between the motor live parts
and the drive control unit. See section Connection of motor temperature sensor to
the drive via an option module (page 100).
4. You can connect the sensor to a digital input of the drive via a customer’s external
relay. The sensor and the relay must form a double or reinforced insulation between
the motor live parts and the drive control unit. See section Connection of motor
temperature sensor to the drive via a relay (page 101).
￭ Connecting motor temperature sensor to the drive via an option module
This table shows:
• option module types that you can use for the motor temperature sensor connection
• insulation or isolation level that each option module forms between its temperature
sensor connector and other connectors
• temperature sensor types that you can connect to each option module
• temperature sensor insulation requirement in order to form, together with the
insulation of the option module, a reinforced insulation between the motor live parts
and the drive control unit.
Temperature sensor in-
sulation requirement
Temperature
sensor type
Option module
Pt100,
Pt1000
KTYPTCInsulation/IsolationType
No special requirement--xReinforced insulation
between the sensor con-
nector and the other con-
nectors of the module (in-
cluding drive control unit
connector). –> No special
requirements for the ther-
mistor insulation level.
(The drive control unit is
PELV compatible also
when the module and a
thermistor protection cir-
cuit are installed.)
CMOD-02
No special requirement--xCPTC-02
Guidelines for planning the electrical installation 111
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