Siemens MICROMASTER 440 - Page 228

3 Functions Issue 10/06
MICROMASTER 440 Operating Instructions
228 6SE6400-5AW00-0BP0
r0631
ADC
5 V
Signal
loss
detection
T
1
= 4 s
2
1
No sensor
PTC
KTY
0
P0604
Fault
F0015
&
P0601 = 2
Thermal
motor
model
r0633
r0632
r0035
1≥
Motor
i2t
temp.
reaction
P0610
P0601
Equivalent
circuit data
P
V,mot
Power dissipation
V
?
0
1
0
1
r0052
Bit13
PTC
KTY
Fig. 3-93 Thermal motor protection
Temperature rise classes
In drive technology, temperature rise issues play a decisive role when
dimensioning electrical machinery. Different temperature limits apply for the various
materials used in electric motors. Depending on the insulating material being used,
a differentiation is made according to thermal classes (refer to the motor rating
plate) with defined limit temperatures. An excerpt from IEC85 is provided in Table
3-36.
Max.perm.temperatureThermal Class
Y
A
E
B
F
90 °C
105 °C
120 °C
130 °C
155 °C
H180 °C
Excerpt from IEC 85
Table 3-36 Thermal classes
For the temperature model or the KTY84 sensor, the appropriate value ϑ
warn
must
be calculated and entered into parameter P0604 (temperature warning threshold,
default: 130°C). The following applies:
1.1
trip
warn
P0604
ϑ
=ϑ=