Using a digital input and 10 V 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 [2] Thermistor Trip
Set 1-93 Thermistor Source to [6] Digital Input 29
R
OFF
ON
<800 Ω >2.9 kΩ
18
19
12 20 55
27 29 42 45 50 53 54
DIGI IN
DIGI IN
DIGI IN
DIGI IN
61 68 69
N
P
COMM. GND
+24V
0/4-20mA A OUT / DIG OUT 0/4-20mA A OUT / DIG OUT
COM A IN
COM DIG IN
10V/20mA IN
10V/20mA IN
10V OUT
BUS TER.
OFF ON
130BB898.10
Figure 2.29 Digital Input/10 V Power Supply
Using an analog input and 10 V 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 [2] Thermistor Trip
Set 1-93 Thermistor Source to [2] Analog Input 54
NOTICE!
Do not set Analog Input 54 as reference source.
18
19
12 20 55
27 29 42 45 50 53 54
DIGI IN
DIGI IN
DIGI IN
DIGI IN
61 68 69
N
P
COMM. GND
+24V
0/4-20mA A OUT / DIG OUT 0/4-20mA A OUT / DIG OUT
COM A IN
COM DIG IN
10V/20mA IN
10V/20mA IN
10V OUT
BUS TER.
OFF ON
130BB897.10
R
<3.0 k Ω
>2.9k Ω
OFF
ON
Figure 2.30 Analog Input/10 V Power Supply
Input Supply Voltage
[V]
Threshold
Cut-out Values [Ω]
Digital 10
<800 ⇒ 2.9 k
Analog 10
<800 ⇒ 2.9 k
Table 2.25 Supply Voltage
NOTICE!
Check that the selected supply voltage follows the
specification of the used thermistor element.
Summary
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 for how long time the motor can run at the high
temperature before it is stopped to prevent over heating.
If the motor is overloaded without reaching the
temperature, the ETR shuts of the motor.
ETR is activated in 1-90 Motor Thermal Protection.
Product Overview
Design Guide
44 Danfoss A/S © Rev. 2014-01-14 All rights reserved. MG18C522
22
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