Danfoss VLT HVAC Drive FC 100 Series, Руководство по конструкции

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Figure 2.39
Using a digital input and 24V as power supply:
Example: The Adjustable frequency drive trips when the
motor temperature is too high.
Parameter set-up:
Set
1-90 Motor Thermal Protection to Thermistor Trip [2]
Set 1-93 Thermistor Source to Digital Input 33 [6]
PTC / Thermistor
OFF
ON
+24V
12 13 18 37 32
A
27 19 29 33
B
20
GND
R <6.6 k Ω >10.8 k Ω
130BA151.11
Figure 2.40
Using a digital input and 10V as power supply:
Example: The Adjustable frequency drive trips when the
motor temperature is too high.
Parameter set-up:
Set
1-90 Motor Thermal Protection to Thermistor Trip [2]
Set 1-93 Thermistor Source to Digital Input 33 [6]
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
Figure 2.41
Using an analog input and 10V as power supply:
Example: The Adjustable frequency drive trips when the
motor temperature is too high.
Parameter set-up:
Set
1-90 Motor Thermal Protection to Thermistor Trip [2]
Set 1-93 Thermistor Source to Analog Input 54 [2]
Do not select a reference source.
Figure 2.42
Input
Digital/analog Supply Voltage V
Cut-out Values Threshold
Cut-out Values
Digital 24
< 6.6k
Ω
- > 10.8k
Ω
Digital 10
< 800
Ω
- > 2.7k
Ω
Analog 10 < 3.0k
Ω
- > 3.0k
Ω
Table 2.19
NOTE!
Ensure that the chosen supply voltage follows the specifi-
cation of the thermistor element utilized.
Summary
With the Torque limit feature, the motor is protected for
being overloaded independent of the speed. With the ETR,
the motor is protected for being overheated and there is
no need for any further motor protection. That means
when the motor is heated up, the ETR timer controls how
long the motor may run at that temperature before it is
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HVAC Drive Design Guide
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