ETR
The calculations estimate the need for a lower load at
lower speed due to less cooling from the fan incorporated
in the motor.
1.2
1.0
1.4
30
10
20
100
60
40
50
1.8
1.6
2.0
2000
500
200
400
300
1000
600
t [s]
175ZA052.11
fOUT = 0.2 x f M,N
fOUT = 2 x f M,N
fOUT = 1 x f M,N
IMN
IM
Figure 6.5 ETR profile
ATEX ETR
The B-option PTC Thermistor Card MCB 112 offers ATEX
approved monitoring of motor temperature. Alternatively,
an external ATEX approved PTC protection device can be
used.
NOTICE!
Use only ATEX Ex-e approved motors for this function.
See motor nameplate, approval certificate, data sheet or
contact the 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
parameter 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 nameplate
1-99 ATEX ETR interpol points
current
Parameter 1-23 Motor Frequency Enter the same value as for
4-19 Max Output Frequency
4-19 Max Output Frequency
Motor nameplate, possibly
reduced for:
•
long motor cables
•
sinus filter
•
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
fulfills the requirement from
the motor nameplate. If not,
use a sine-wave filter.
14-26 Trip Delay at Inverter Fault 0
Table 6.3 ATEX Ex-e Programming Example
CAUTION
It is mandatory to compare the minimum switching
frequency requirement stated by the motor
manufacturer to the minimum switching frequency of
the adjustable frequency drive in
14-01 Switching
Frequency
. If the adjustable frequency drive does not
meet this requirement, use a sine-wave filter.
Klixon
The Klixon type thermal circuit breaker uses a
®
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 adjustable frequency drive trips when the
motor temperature is too high.
Programming
Instruction Manual
58
Danfoss A/S © Rev. 2014-02-07 All rights reserved.
MG37A222
6
6
Summary of Contents for VLT AutomationDrive FC 302
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