Implementing a motor temperature sensor connection
WARNING!
IEC 61800-5-1 requires double or reinforced insulation between live parts and
accessible parts when:
• the accessible parts are not conductive, or
• the accessible parts are conductive, but not connected to the protective
earth.
Obey this requirement when you plan the connection of the motor temperature
sensor to the drive.
You have these 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. See the control cable connection instructions. Make sure that the
voltage does not exceed the maximum allowed voltage over the sensor.
2. If there is basic insulation between the sensor and the live parts of the motor, or
if the insulation type is not known, 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 Connecting
a motor temperature sensor to the drive through an option module (page 98).
Make sure that the voltage does not exceed the maximum allowed voltage over
the sensor.
3. If there is basic insulation between the sensor and the live parts of the motor, or
if the insulation type is not known: You can connect a sensor to a digital input of
the drive via an external relay. The sensor and the relay must form a double or
reinforced insulation between the motor's live parts and the digital input of the
drive. Make sure that the voltage does not exceed the maximum allowed voltage
over the sensor.
￭ Connecting a motor temperature sensor to the drive through 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.
98 Guidelines for planning the electrical installation
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