GE AF-650 GP Programming Manual page 37

Parameter Descriptions
F-10 Electronic Overload
Option:
[6] Elec. OL Trip
2
[7] Elec. OL
3 3
Warning 3
[8] Elec. OL Trip
3
[9] Elec. OL
Warning 4
[10] Elec. OL Trip
4
3.3.3.1 PTC Thermistor Connection
Illustration 3.6 PTC Profile
Using a digital input and 10 V as supply:
Example: The frequency converter trips when the motor
temperature is too high.
Parameter set-up:
•
Set parameter F-10 Electronic Overload to [2]
Thermistor Trip.
•
Set parameter F-12 Motor Thermistor Input to [6]
Digital Input.
36
Function:
02/2016 All rights reserved.
Illustration 3.7 PTC Thermistor Connection - Digital Input
Using an analog input and 10 V as supply:
Example: The frequency converter trips when the motor
temperature is too high.
Parameter set-up:
•
Set parameter F-10 Electronic Overload to [2]
Thermistor Trip.
•
Set parameter F-12 Motor Thermistor Input to [2]
Analog Input 54.
Illustration 3.8 PTC Thermistor Connection - Analog Input
Input Supply voltage
digital/analog
Digital 10 V
Analog 10 V
Table 3.5 Threshold Cutout Values
NOTICE
Check that the selected supply voltage follows the
specification 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 (parameter P-30 Stator
Resistance (Rs)) for PM motors and also rotor resistance
(parameter P-31 Rotor Resistance (Rr)) for asynchronous
motors, depending on winding temperature. The
calculation is:
where
Rs = Rs x (1 + α x ΔT) Ω α
20° C cu
Threshold
cut out values.
<800 Ω⇒2.7 kΩ
<3.0 kΩ⇒3.0 kΩ
= 0 . 00393
cu
DET-618D