Etr; Atex Etr; Klixon - Danfoss VLT AutomationDrive FC 300 Programming Manual

Parameter Descriptions
4500
4000
3500
3 3
3000
2500
2000
1500
1000
500
0
-25
Illustration 3.5 KTY type selection
KTY Sensor 1: KTY 84-1 with 1kΩ at 100°C
KTY Sensor 2: KTY 81-1, KTY 82-1 with 1kΩ at 25°C
KTY Sensor 3: KTY 81-2, KTY 82-2 with 2kΩ at 25°C
NOTE
If the temperature of the motor is utilized through a
thermistor or KTY sensor the PELV is not complied with in
case of short circuits between motor windings and sensor. In
order to comply with PELV the sensor must be extra isolated.

3.3.10.3 ETR

The calculations estimate the need for a lower load at lower
speed due to less cooling from the fan incorporated in the
motor.
Illustration 3.6 ETR profile
46
0 25 50 75 100
Temperature [°C]
KTY type 1 KTY type 2
t [s]
2000
1000
600
500
400
300
200
100 f OUT = 1 x f M,N (par. 1-23)
60 f OUT = 2 x f M,N
50
f OUT = 0. 2 x f M,N
40
30
20
I
M
10
I (par. 1-24)
1.0 1.2 1.4 1.6 1.8 2.0
M,N
MG.33.MB.02 - VLT
FC 300 Programming Guide

3.3.10.4 ATEX ETR

The B-option MCB 112 PTC Thermistor option offers ATEX
approved monitoring of motor temperature. Alternatively,
an external ATEX approved PTC protection device can be
used.
NOTE
Only ATEX Ex e approved motors may be used for this
function. See motor nameplate, approval certificate, data
sheet or contact motor supplier.
Programme the following parameters when using MCB 112:
•
•
125 150
Furthermore, when controlling an Ex-e motor with
"Increased Safety", the following parameters must be
KTY type 3
programmed:
•
•
•
•

3.3.10.5 Klixon

The Klixon type thermal circuit breaker uses a KLIXON
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 power supply:
Example: The frequency converter 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 [6]
12 13 18
PTC / Thermistor
®
is a registered Danfoss trademark
Parameter group 5-1* Digital Input
5-19 Terminal 37 Safe Stop
1-90 Motor Thermal Protection
1-94 ATEX ETR cur.lim. speed reduction
1-98 ATEX ETR interpol. points freq.
1-99 ATEX ETR interpol points current
OFF
19 27 29 32 33 20 37
ON
<6.6 k Ω >10.8 k Ω
®
metal
R