ABB ACS560 Firmware Manual page 83

After this, when power is applied to the drive, the motor is assumed to be at the
estimated temperature.
2. Motor temperature is calculated using the user-adjustable motor thermal time and
motor load curve. The load curve should be adjusted in case the ambient
temperature exceeds 30%.
Note: The motor thermal model can be used when only one motor is connected to
the inverter.
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:
• 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.
• 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.
• Alternative (for R0...R2 frames only): You can connect the sensor with a basic
insulation to the analog/digital input(s) of the drive if you do not connect any other
external control circuits to drive digital and analog inputs.
Temperature monitoring using PTC sensors
1...3 PTC sensors can be connected in series to an analog input and an analog
output.
The analog output feeds a constant excitation current of 1.6 mA through the sensor.
The sensor resistance increases as the motor temperature rises, as does the voltage
Program features 83