ABB ACS800 Series Firmware Manual page 105

No. Name/Value
THERMISTOR
KLIXON
Description
Motor thermal protection is activated through digital input DI6. A motor
thermistor, or a break contact of a thermistor relay, must be connected
to digital input DI6. The drive reads the DI6 states as follows:
DI6 Status (Thermistor Resistance)
1 (0...1.5 kOhm)
0 (4 kOhm or higher)
WARNING! According to IEC 664, the connection of the motor
thermistor to the digital input requires double or reinforced
insulation between motor live parts and the thermistor.
Reinforced insulation entails a clearance and creeping distance of 8
mm (400 / 500 VAC equipment). If the thermistor assembly does not
fulfil the requirement, the other I/O terminals of the drive must be
protected against contact, or a thermistor relay must be used to isolate
the thermistor from the digital input.
WARNING! Digital input DI6 may be selected for another use.
Change these settings before selecting THERMISTOR. In
other words, ensure that digital input DI6 is not selected by any
other parameter.
The figure below shows the alternative thermistor connections. At the
motor end the cable shield should be earthed through a 10 nF
capacitor. If this is not possible, the shield is to be left unconnected.
Alternative 1
Thermistor
relay
T
Motor
Alternative 2
T
10 nF
Motor
Temperature switch in the motor windings. Uses digital input DI6.
Temperature
Normal
Overtemperature
RMIO I/O Board
6 18 DI6
7 19 +24 VDC
RMIO I/O Board
6 18 DI6
7 19 +24 VDC
Actual signals and parameters
93
FbEq
3
4