Thermal Protection Of Motor Cable - ABB ACS880 Firmware Manual

122 Standard program features
FEN-xx encoder interfaces (optional) also have a connection for one KTY84 sensor.
The figure and table below show typical KTY84 sensor resistance values as a
function of the motor operating temperature.
KTY84 scaling
90 °C = 936 ohm
110 °C = 1063 ohm
130 °C = 1197 ohm
150 °C = 1340 ohm
The warning and fault limits can be adjusted by parameters.
For the wiring of the sensor, refer to the Hardware Manual of the drive.
Motor fan control logic (parameters 35.100...35.106)
If the motor has an external cooling fan, it is possible to use a drive signal (for
example, running/stopped) to control the starter of the fan via a relay or digital output.
A digital input can be selected for fan feedback. A loss of the feedback signal will
optionally cause a warning or a fault.
Start and stop delays can be defined for the fan. In addition, a feedback delay can be
set to define the time within which feedback must be received after the fan starts.
Settings
Parameter group 35 Motor thermal protection
settings (page 465); parameter


Thermal protection of motor cable

The control program contains a thermal protection function for the motor cable. This
function should be used, for example, when the nominal current of the drive exceeds
the current-carrying capacity of the motor cable.
Ohm
3000
2000
1000
0
-100
(page 323) and
95.15 Special HW settings
0 100 200
91 Encoder module
(page 479).
o
T C
300