3.2.14 PTC Thermistor Connection
1330
550
250
-20 °C
175HA183.11
4000
3000
R
(Ω)
nominal
nominal -5 °C
nominal +5 °C
[°C]
Illustration 3.12 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 1-90 Motor Thermal Protection
to
[2]
Thermistor Trip
.
•
Set
parameter 1-93 Thermistor Source
to
[6] Digital
Input
.
PTC / Thermistor
R
OFF
ON
<800 Ω
+10V
130BA152.10
>2.7 kΩ
12 13
18
37
32
27
19
29
33 20
55
50
39 42
53 54
Illustration 3.13 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 1-90 Motor Thermal Protection
to
[2]
Thermistor Trip
.
•
Set
parameter 1-93 Thermistor Source
to
[2] Analog
Input 54
.
55
50
39 42
53 54
R
<3.0 k
Ω
>3.0 k
Ω
+10V
130BA153.11
PTC / Thermistor
OFF
ON
Illustration 3.14 PTC Thermistor Connection - Analog Input
Input
digital/analog
Supply voltage Threshold
cutout values
Digital
10 V
<800
Ω⇒
2.7 k
Ω
Analog
10 V
<3.0 k
Ω⇒
3.0 k
Ω
Table 3.8 Threshold Cutout Values
NOTICE
Check that the selected supply voltage follows the
specification of the used thermistor element.
3.2.15 KTY Sensor Connection
NOTICE
FC 302 only.
KTY sensors are used especially in permanent magnet
servo motors (PM motors) for dynamic adjusting of motor
parameters as stator resistance (
parameter 1-30 Stator
Resistance (Rs)
) for PM motors and also rotor resistance
(
parameter 1-31 Rotor Resistance (Rr)
) for asynchronous
motors, depending on winding temperature. The
calculation is:
Rs = Rs
20° C
x (1 + α
cu
x ΔT) Ω
where
α
cu
= 0 . 00393
KTY sensors can be used for motor protecting
(
parameter 1-97 Thermistor Threshold level
).
FC 302 can handle 3 types of KTY sensors, defined in
parameter 1-95 Thermistor Sensor Type
. The actual sensor
temperature can be read out from
parameter 16-19 Thermistor Sensor Temperature
.
Parameter Descriptions
Programming Guide
MG33MP02
Danfoss A/S © 10/2018 All rights reserved.
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Summary of Contents for VLT AutomationDrive FC 302
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