ABB ACS280 Firmware Manual page 76

76 Program features
Sensor insulation and connection
One sensor
Motor
3.3 nF
One sensor
T
WARNING! IEC 60664 requires 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 fulfill this requirement, connect a thermistor to the drive's control terminals
using any of these alternatives:
• Separate the thermistor from live parts of the motor with double reinforced
insulation.
• Protect all circuits connected to the drive's digital and analog inputs. Protect
against contact, and insulate from other low voltage circuits with basic
insulation (rated for the same voltage level as the drive's main circuit).
• Use an external thermistor relay. The relay insulation must be rated for the
same voltage level as the drive's main circuit.
Three sensors
AI1
GND
AO
GND
AI1
GND
T
AO
GND
Motor
3.3 nF
Three sensors
T T
AI1
GND
AO
GND
AI1
GND
AO
GND