Danfoss VLT AQUA Drive FC 202 Programming Manual page 62

Parameter Description
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]
3 3
Thermistor Trip.
•
Set parameter 1-93 Thermistor Source to [2] Analog
Input 54.
39 42 50 53 54 55
PTC / Thermistor
Illustration 3.14 PTC Thermistor Connection - Analog Input
Input
digital/analog
Digital
Analog
Table 3.10 Threshold Cutout Values
NOTICE
Check that the selected supply voltage follows the
specification of the used thermistor element.
3.3.16 ETR
The calculations estimate the need for a lower load at
lower speed due to less cooling from the fan incorporated
in the motor.
t [s]
2000
1000
600
500
400
300
200
100
60
50
40
30
20
10
1.0
Illustration 3.15 ETR Profile
60
OFF
ON
<3.0 k Ω
>3.0 k
Supply voltage Threshold
cutout values
<800 Ω⇒2.7 kΩ
10 V
10 V <3.0 kΩ⇒3.0 kΩ
f OUT = 1 x f M,N (par. 1-23)
f OUT = 2 x f M,N
f OUT = 0. 2 x f M,N
I
1.2 1.4 1.6 1.8 2.0
Danfoss A/S © 05/2018 All rights reserved.
®
VLT AQUA Drive FC 202
3.3.17 ATEX ETR
®
The VLT
approved monitoring of motor temperature. Alternatively,
an external ATEX-approved PTC protection device can be
used.
NOTICE
Only use ATEX Ex-e-approved motors for this function.
See the motor nameplate, approval certificate, datasheet,
or contact motor supplier.
When controlling an Ex-e motor with increased safety, it is
important to ensure certain limitations. The parameters
that must be programmed are presented in Table 3.11.
R
Function
Ω
Parameter 1-90 Motor Thermal
Protection
Parameter 1-94 ATEX ETR cur.lim.
speed reduction
Parameter 1-98 ATEX ETR interpol.
points freq.
Parameter 1-99 ATEX ETR interpol
points current
Parameter 1-23 Motor Frequency
Parameter 4-19 Max Output
Frequency
Parameter 4-18 Current Limit
Parameter 5-15 Terminal 33
Digital Input
Parameter 5-19 Terminal 37 Safe
Stop
Parameter 14-01 Switching
Frequency
Parameter 14-26 Trip Delay at
Inverter Fault
Table 3.11 Parameters
I
M
(par. 1-24)
MN
PTC Thermistor Card MCB 112 offers ATEX-
Setting
[20] ATEX ETR
20%
Motor nameplate.
Enter the same value as for
parameter 4-19 Max Output
Frequency.
Motor nameplate, possibly
reduced for long motor cables,
sine-wave filter, or reduced
supply voltage.
Forced to 150% by 1-90 [20]
[80] PTC Card 1
[4] PTC 1 Alarm
Check that the default value
fulfills the requirement from
the motor nameplate. If not,
use a sine-wave filter.
0
MG20OB02