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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
to
[2] Thermistor Trip
Set
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
to
[2] Thermistor Trip
Set
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 k
Ω
Analog
10 V
< 3.0 k
Ω
- > 3.0 k
Ω
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 (
)
for PM motors and also rotor resistance (
) for asynchronous motors, depending on
winding temperature. The calculation is:
Rs = Rs20° C x (1 +
α
cu x
Δ
T )
Ω
where
α
cu = 0.00393
KTY sensors can be used for motor protecting (
AF-650 GP can handle three types of KTY sensors, defined
in
. The actual sensor temperature can
be read out from
Parameter Descriptions
AF-650 GP Programming Guide
34
DET-618C
3
3