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VLT® PTC Thermistor Card MCB 112
Operating Guide
3 sensors in series
6 sensors in series
4.2.3 Thermal Limitation Curve (Ex eb and Ex ec Motors Only)
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.
СЄ 1180
x З
CONVERTER SUPPLY
VALID FOR 380 - 415V FWP 50Hz
3 ~ Motor
1
MIN. SWITCHING FREQ. FOR PWM CONV. 3kHz
2
l = 1.5XI
t
= 10s
t
= 10min
OL
COOL
M,N
3
MIN. FREQ. 5Hz
MAX. FREQ. 85 Hz
4
PWM-CONTROL
f [Hz]
5
15
Ix/I
0.4
0.8
M,N
PTC
°C
DIN VDE V 0898-1-401
Manufacture xx
Illustration 7: Motor Nameplate Showing Drive Requirements
1
Minimum switching frequency
2
Maximum current
Procedure
1.
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.
1 0 0 %
8 0 %
4 0 %
5 Hz
15 Hz
Illustration 8: Example of ATEX ETR Thermal Limitation Curve
Danfoss A/S © 2022.08
Trip temperatures
TNF+5 K
TNF
W A R N I N G
Ex-e ll T3
25
50
85
1.0
1.0
0.95
EN 60079-0
EN 60079-7
25 Hz
50 Hz
Release temperatures
TNF-5 K
TNF-20 K
Illustration
3
Minimum motor frequency
4
Maximum motor frequency
AQ267038105120en-000101 / 130R0104 | 19
Commissioning
8.
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