Siemens M200D Manual Do Utilizador
Technical specifications
8.6 Thermistor motor protection
M200D AS-Interface Basic
Manual, 03/2009, A5E01668085-01
Manual, 03/2009, A5E01668085-01
93
8.6
Thermistor motor protection
Temperature sensor
PTC
Thermoclick
Evaluation characteristic to IEC 60947-8
Type A
—
Summation cold resistance sensor circuit
< 1.5 kΩ
No-load voltage of sensor circuit
< 30 V
Short-circuit current sensor circuit
< 1.2 mA
Trip level
3.4 … 3.8 kΩ
Reset level
1.5 … 1.65 kΩ
Short-circuit detection
< 30 Ω
No
Electrical isolation vis-à-vis
Main circuit
U
AS-i
U
PWR
Yes (U
i
= 400 V)
Yes (U
i
= 400 V)
Yes (U
i
= 400 V)
8.7
Switching frequency
If motors are switched too often, this causes the thermal motor model to respond.
The maximum permissible switching frequency depends on the following operating data:
Direct and reversing starters, electronic (sDSte / sRSte) up to 4 kW
3RK1315-5KS71-.AA. (0.15 A to 2 A)
Class 10
Device setup
Class 10
Device setup
Vertical
Horizontal
Rated current I
e
2 A
2 A
2 A
2 A
2 A
2 A
Ambient temperature
40 °C
50 °C
55 °C
40 °C
50 °C
55 °C
Degree of protection
1)
2)
1)
2)
1)
2)
1)
2)
1)
2)
1)
2)
Direct start ED=30 %
(8xI
e
) / 0.4 s
150
1000 150
1000 150
1000 150
1000 150
1000 150
1000
ED=70 % (8xI
e
) / 0.4 s
90
500
90
500
90
500
90
500
90
500
90
500
ED=30 % (8xI
e
) / 0.8 s
75
490
75
490
75
490
75
490
75
490
75
490
ED=70 % (8xI
e
) / 0.8 s
45
250
45
250
45
250
45
250
45
250
45
250
1) Duty cycle current rms value = 1.15 x I
e
→ motor protection
2) Duty cycle limit for motor starter. The motor should be protected against overload here by means of a thermistor.