GE AF-650 GP Programming Manual page 36

Parameter Descriptions
Illustration 3.9 KTY Type Selection
KTY Sensor 1: 1 kΩ at 100 °C (e.g. Philips KTY 84-1)
KTY Sensor 2: 1 kΩ at 25 °C (e.g. Philips KTY 83-1)
KTY Sensor 3: 2 kΩ at 25 °C (e.g. Infineon KTY-10
NOTE
If the temperature of the motor is utilized through a
thermistor or KTY sensor the PELV is not complied with in
case of short circuits between motor windings and sensor.
In order to comply with PELV the sensor must be extra
isolated.
3.3.3.3 Electronic Thermal Overload
The calculations estimate the need for a lower load at
lower speed due to less cooling from the fan incorporated
in the motor.
Illustration 3.10 Electronic Thermal Overload Profile
AF-650 GP Programming Guide
3.3.3.4 Klixon
The Klixon type thermal circuit breaker uses a KLIXON
metal dish. At a predetermined overload, the heat caused
by the current through the disc causes a trip.
Using a digital input and 24 V as power supply:
Example: The frequency converter trips when the motor
temperature is too high
Parameter set-up:
Set F-10 Electronic Overload to [2] Thermistor Trip
Set F-12 Motor Thermistor Input to [6] Digital Input
Illustration 3.11 Thermistor Connection
F-11 Motor External Fan
Option:
[0] No
*
[1] Yes Applies an external motor fan (external ventilation), so
DET-618C
Function:
No external fan on motor, i.e. the motor is derated at
low speed.
no derating of the motor is required at low speed. The
upper curve in graph above (fout = 1 x fM,N) is
followed if the motor current is lower than nominal
motor current (see P-03 Motor Current). If the motor
current exceeds nominal current, the operation time
still decreases as if no fan were installed.
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