Guidelines for planning the electrical installation 75
Connecting a motor temperature sensor to the drive I/O
WARNING! IEC 60664 and IEC 61800-5-1 require 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 connect a motor temperature sensor and other similar components to the drive, you
have four alternatives:
1. If there is double or reinforced insulation between the sensor and the live parts of the
motor, you can connect the sensor directly to the analog/digital inputs of the drive.
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 75).
4. You can connect the sensor to a digital input of the drive via a relay (internal option or
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 76).
Connection of 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 double or reinforced insulation between the motor
live parts and the drive control unit.
Option module Temperature sensor
type
Temperature sensor
insulation requirement
Type Insulation/Isolation PTC KTY Pt100,
Pt1000
FIO-11 Galvanic isolation between sensor
connector and other connectors
(including drive control unit connector)
- X X Reinforced insulation
FEN-xx Galvanic isolation between sensor
connector and other connectors
(including drive control unit connector)
X X - Reinforced insulation
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