Install the protective component as close to the inductive load as possible. Do not install
protective components at the relay outputs.
230 V AC
230 V AC
+ 24 V DC
1
2
3
4
Relay output1
Varistor2
RC filter3
Diode4
Limiting relay output maximum voltages at high installation
altitudes
See Isolation areas, R1…R5 (page 294) and Isolation areas, R6…R9 (page 295).
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.
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 inputs of the drive.
110 Guidelines for planning the electrical installation
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