Implementing 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.
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. All other
circuits connected to the digital and analog inputs (typically extra-low voltage
circuits) must be:
• 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: Extra-low voltage circuits (for example, 24 V DC) typically do not meet
these requirements.
As an alternative, you can connect the sensor with basic insulation to the
analog/digital input(s) of the drive, if you do not connect any other external
control circuits to the drive digital and analog inputs.
3. 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 live parts and the digital input of the drive.
Protecting the drive against ground faults
The drive is equipped with an internal ground fault protective function to protect
the unit against ground faults in the motor and motor cable. This function is not
a personnel safety or a fire protection feature. See the firmware manual for more
information.
￭
Residual current device compatibility
The drive is suitable for use with residual current devices of Type B.
Guidelines for planning the electrical installation 55
To Next Page
Loading...
