Danfoss VLT AutomationDrive FC 302 Programming Manual page 56

Parameter Descriptions
4500
4000
3500
3 3
3000
2500
2000
1500
1000
500
0
-25
Illustration 3.15 KTY Type Selection
KTY Sensor 1: 1 kΩ at 100 °C (e.g. Philips KTY 84-1)
KTY Sensor 2: 1 kΩ at 25 °C (e.g. Philips KTY 83-1)
KTY Sensor 3: 2 kΩ at 25 °C (e.g. Infineon KTY-10
NOTICE
If the temperature of the motor is utilised through a
thermistor or KTY sensor, the PELV is not complied with
in case of short circuits between motor windings and
sensor. To comply with PELV the sensor must be extra
isolated.
3.3.11.3 ETR
The calculations estimate the need for a lower load at
lower speed due to less cooling from the fan incorporated
in the motor.
t [s]
2000
1000
600
500
400
300
200
100
60
50
40
30
20
10
1.0
Illustration 3.16 ETR Profile
54
0 25 50 75 100
Temperature [°C]
KTY type 1 KTY type 2
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
®
VLT AutomationDrive FC 301/302 Programming Guide
3.3.11.4 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.
NOTICE
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.
125 150
Function
KTY type 3
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 Enter the same value as for
parameter 4-19 Max Output
Frequency
parameter 4-18 Current Limit
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 3.8 Parameters
CAUTION
Compare the minimum switching frequency requirement
stated by the motor manufacturer to the minimum
switching frequency of the frequency converter, the
I
default value in parameter 14-01 Switching Frequency. If
M
(par. 1-24)
the frequency converter does not meet this requirement,
MN
use a sine wave filter.
More information about ATEX ETR Thermal Monitoring can
be found in the Application Note MN33G.
MG33MI02 - Rev. 2013-11-20
Setting
[20] ATEX ETR
20%
Motor name plate
parameter 4-19 Max Output
Frequency
Motor name plate, possibly
reduced for long motor
cables, sinus 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
fulfils the requirement from
Motor name plate. If not, use
sine wave filter.
0