4.2.10 PTC Thermistor Connection
1330
550
250
-20 °C
175HA183.11
4000
3000
R
(Ω)
nominal
nominal -5 °C
nominal +5 °C
[°C]
Illustration 4.9 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
.
+ 10V
39 42 50 53 54 55
12 13 18 19 27 29 32 33 20
PTC / Thermistor
OFF
ON
R
<800
>2.7 k
e30bg754.10
Illustration 4.10 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 4.11 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 4.5 Threshold Cutout Values
NOTICE
Check that the selected supply voltage follows the
specification of the used thermistor element.
4.2.11 ETR
The calculations estimate the need for a lower load at
lower speed due to less cooling from the fan incorporated
in the motor.
1.2
1.0
1.4
30
10
20
100
60
40
50
1.8
1.6
2.0
2000
500
200
400
300
1000
600
t [s]
175ZA052.12
fOUT = 2 x f M,N
fOUT = 0.2 x f M,N
fOUT = 1 x f M,N(par. 1-23)
I
MN
(par. 1-24)
I
M
Illustration 4.12 ETR Profile
4.2.12 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 supply:
Example: The frequency converter trips when the motor
temperature is too high.
Parameter Descriptions
Programming Guide
MG06J202
Danfoss A/S © 03/2019 All rights reserved.
47
4
4
Summary of Contents for VLT AutomationDrive FC 361
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