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3.3.13.1 PTC Thermistor Connection
1330
550
250
-20 °C
175HA183.11
4000
3000
R
(Ω)
nominal
nominal -5 °C
nominal +5 °C
[°C]
Illustration 3.11 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
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 3.12 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
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 3.13 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
Table 3.9 Threshold Cut Out Values
NOTICE
Check that the selected supply voltage follows the
specification of the used thermistor element.
3.3.13.2 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 3.14 ETR Profile
Parameter Descriptions
VLT
®
HVAC Drive FC 102
52
Danfoss A/S © 03/2015 All rights reserved.
MG11CE02
3
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