GE Industrial Solutions AF-650 GP General Purpose Drive Programming Guide - Manual (Page 35)

F-10 Electronic Overload
Option: Function:
[10] Elec. OL Trip
4
[20] ATEX Elec.
OL
Activates the thermal monitoring function
for Ex-e motors for ATEX. Enables H-94 ATEX
overload cur.lim. speed reduction, H-98 ATEX
overload interpol. points freq. and H-99 ATEX
overload interpol points current.
[21] Advanced
Elec. OL
3.3.3.1 PTC Thermistor Connection
Illustration 3.6 PTC Profile
Using a digital input and 10 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 3.7 PTC Thermistor Connection - Digital Input
Using an analog input and 10 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 [2] Analog Input 54
Illustration 3.8 PTC Thermistor Connection - Analog Input
Input
Digital/analog
Supply Voltage Threshold
Cut-out Values
Digital 10 V < 800
Ω - > 2.7 kΩ
Analog 10 V < 3.0 k
Ω - > 3.0 kΩ
NOTE
Check that the chosen supply voltage follows the specifi-
cation of the used thermistor element.
3.3.3.2 KTY Sensor Connection
KTY sensors are used especially in Permanent Magnet
Servo Motors (PM motors) for dynamic adjusting of motor
parameters as stator resistance (P-30 Stator Resistance (Rs))
for PM motors and also rotor resistance (P-31 Rotor
Resistance (Rr)) for asynchronous motors, depending on
winding temperature. The calculation is:
Rs = Rs
20° C
x (1 + α
cu
x Δ T ) Ω where α
cu
= 0.00393
KTY sensors can be used for motor protecting (H-97 KTY
Threshold level).
AF-650 GP can handle three types of KTY sensors, defined
in H-95 KTY Sensor Type. The actual sensor temperature can
be read out from DR-19 KTY sensor temperature.
Parameter Descriptions AF-650 GP Programming Guide
34 DET-618C
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