1.21.0 1.4
30
10
20
100
60
40
50
1.81.6 2.0
2000
500
200
400
300
1000
600
t [s]
175ZA052.12
f
OUT
= 2 x f
M,N
f
OUT
= 0.2 x f
M,N
f
OUT
= 1 x f
M,N
(par. 1-23)
I
MN
(par. 1-24)
I
M
Illustration 6.6 ETR profile
6.1.3.4
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.
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 the following
application example.
Parameters
Function Setting
1-90 Motor Thermal
Protection
[20] ATEX ETR
1-94 ATEX ETR cur.lim. speed
reduction
20%
1-98 ATEX ETR interpol.
points freq.
Motor name plate
1-99 ATEX ETR interpol
points current
1-23 Motor Frequency Enter the same value as for
4-19 Max Output Frequency
4-19 Max Output Frequency Motor name plate, possibly
reduced for long motor cables,
sinus filter or reduced supply
voltage
4-18 Current Limit Forced to 150% by 1-90 [20]
5-15 Terminal 33 Digital
Input
[80] PTC Card 1
5-19 Terminal 37 Safe Stop [4] PTC 1 Alarm
14-01 Switching Frequency Check that the default value fulfils
the requirement from Motor
name plate. If not -use sine wave
filter.
14-26 Trip Delay at Inverter
Fault
0
Table 6.3
CAUTION
It is mandatory to compare the minimum switching
frequency requirement stated by the motor manufacturer
to the minimum switching frequency of the frequency
converter the default value in 14-01 Switching Frequency. If
the frequency converter does not meet this requirement, a
sine wave filter must be used.
More information about ATEX ETR Thermal Monitoring can
be found in the Application Note MN33GXYY.
6.1.3.5
Klixon
The Klixon type thermal circuit breaker uses a KLIXON
®
metal 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]
How to Programme the Low Ha... VLT Automation Low Harmonic Drive Operating Instructions
72 MG34O202 - VLT
®
is a registered Danfoss trademark
6
6
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