Danfoss VLT AutomationDrive FC 302 Instruction Manual page 60

Programming
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
6 6
100
60
50
40
30
20
10
1.0
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.
58
1.2 1.4 1.6 1.8 2.0
Danfoss A/S © Rev. 2014-02-07 All rights reserved.
Instruction Manual
Function
parameter 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
Parameter 1-23 Motor Frequency Enter the same value as for
4-19 Max Output Frequency
fOUT = 1 x f M,N
fOUT = 2 x f M,N
fOUT = 0.2 x f M,N
4-18 Current Limit
IM
IMN
5-15 Terminal 33 Digital Input
5-19 Terminal 37 Safe Stop
14-01 Switching Frequency
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
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.
Parameters
Setting
[20] ATEX ETR
20%
Motor nameplate
4-19 Max Output Frequency
Motor nameplate, possibly
reduced for:
•
long motor cables
•
sinus filter
•
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.
®
metal dish.
MG37A222