1.
-
Trip temperatures
Release temperatures
3 sensors in series
TNF+5 K
TNF-5 K
6 sensors in series
TNF
TNF-20 K
4.2.3 Thermal Limitation Curve (Ex eb and Ex ec Motors Only)
W A R N I N G
EXPLOSION DANGER
Always use the thermal limitation curve in combination with Ex eb and Ex ec motors. See
The output current/motor speed is permanently monitored and limited depending on the characteristic given by the motor manu-
facturer on the motor nameplate data and data sheets.
e3
0b
d8
88
.1
1
CONVERTER SUPPLY
VALID FOR 380 - 415V FWP 50Hz
3 ~ Motor
MIN. SWITCHING FREQ. FOR PWM CONV. 3kHz
l = 1.5XI
M,N
t
OL
= 10s
t
COOL
= 10min
MIN. FREQ. 5Hz
MAX. FREQ. 85 Hz
PWM-CONTROL
f [Hz]
Ix/I
M,N
PTC
°C
DIN VDE V 0898-1-401
Manufacture xx EN 60079-0
EN 60079-7
СЄ
1180
Ex-e ll T3
5
15
25
50
85
0.4
0.8
1.0
1.0
0.95
1
xЗ
2
3
4
Illustration 7: Motor Nameplate Showing Drive Requirements
1
Minimum switching frequency
2
Maximum current
3
Minimum motor frequency
4
Maximum motor frequency
Procedure
Program the characteristic values as frequency/current pairs in
parameters 1-98 ATEX ETR interpol. points freq.
and
1-99 ATEX
ETR interpol points current
.
5 Hz
15 Hz
25 Hz
50 Hz
e
1
3
0
b
b
9
0
9
.1
1
1 0 0 %
8 0 %
4 0 %
Illustration 8: Example of ATEX ETR Thermal Limitation Curve
AQ267038105120en-000101 / 130R0104 | 19
Danfoss A/S © 2022.08
Commissioning
VLT® PTC Thermistor Card MCB 112
Operating Guide