Implementing a motor temperature sensor connection
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.
You have four implementation 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 input(s) 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 input(s) of the drive if all other circuits connected
to the 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 reinforced insulation between the motor live parts and the drive
control unit. See Connection of motor temperature sensor to the drive via an option
module (page 33).
4. You can connect a sensor to a digital input of the drive via an external thermistor relay.
The insulation of the relay of must be rated for the main circuit voltage of the motor.
￭ Connection of motor temperature sensor to the drive via an option
module
This table shows:
• the option module types that you can use for the motor temperature sensor connection
• the insulation or isolation level that each option module forms between its temperature
sensor connector and other connectors
• the temperature sensor types that you can connect to each option module
• the 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.
Electrical planning guidelines 33
To Next Page
Loading...
