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FC 302 can handle three types of KTY sensors, defined in
. The actual sensor temperature can be
read out from
0
500
1000
1500
2000
2500
3000
3500
4000
4500
-25
0
25
50
75
100
125
150
Temperature [°C]
R
es
is
ta
nc
e
[O
hm
]
KTY type 1
KTY type 2
KTY type 3
130BB917.10
Illustration 3.15 KTY Type Selection
KTY Sensor 1: 1 k
Ω
at 100
°
C (e.g. Philips KTY 84-1)
KTY Sensor 2: 1 k
Ω
at 25
°
C (e.g. Philips KTY 83-1)
KTY Sensor 3: 2 k
Ω
at 25
°
C (e.g. Infineon KTY-10
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.
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]
175ZA052.12
fOUT = 2 x f M,N
fOUT = 0.2 x f M,N
fOUT = 1 x f M,N(par. 1-23)
I
MN
(par. 1-24)
I
M
Illustration 3.16 ETR Profile
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.
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.
Function
Setting
[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 Motor name plate, possibly
reduced for long motor cables,
sinus filter or reduced supply
voltage
Forced to 150% by 1-90 [20]
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
48
MG33ME02 - VLT
®
is a registered Danfoss trademark
3
3
Содержание VLT AutomationDrive FC 300 Series
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