SIEMENS
6/6
Siemens MD 50.8 · 2017
Motor options
Electrical design
Motor protection
6
■
Selection and ordering data
Protective devices
■
Anti-condensation heating
Motors whose windings are at risk of condensation due to the
climatic conditions, e.g. inactive motors in humid atmospheres or
motors that are subjected to widely fluctuating temperatures, can
be equipped with anti-condensation heaters. Anti-condensation
heating must not be switched on during operation.
Instead of an anti-condensation heater, another possibility is to
connect a voltage that is approximately 4 to 10 % of the rated
motor voltage to stator terminals U1 and V1; 20 to 30 % of rated
motor current is sufficient to heat the motor.
Fig. 6/9
Connection circuit diagram for the anti-condensation heating
Technical specifications
Motor protection
Motor frame size
Order code
63
71
80
90
100
112
132
PTC thermistor, disconnection
✓
✓
✓
✓
✓
✓
✓
M10
PTC thermistor, warning and
disconnection
✓
✓
✓
✓
✓
✓
✓
M11
Winding thermostat,
disconnection
✓
✓
✓
✓
✓
✓
✓
M12
Winding thermostat, warning
and disconnection
1)
✓
✓
✓
✓
✓
✓
✓
M13
KTY 84-130 temperature sensor
✓
✓
✓
✓
✓
✓
✓
M16
1x PT100 resistance
thermometer
✓
✓
✓
✓
✓
✓
✓
M19
1)
Not possible for inverter operation
Number of windings
Example
Function
Number of temperature-dependent
protective devices
Number of terminals
1
Motors with one pole
number
Disconnection
3 or 1 (motor frame sizes 80 and 90)
2
Warning and
disconnection
6
3 (motor frame size 71 to 132)
Motor frame size
Heating power
W
63 … 80
12.5
90 … 112
25
132
50
G_D087_DE_00042
PE
-M
H1 = 1HE1
H2 = 1HE2
15 16
1HE2
1HE1
1HE1
1HE2
1HE1
L
-
N
1HE2
Order code:
115 V anti-condensation heating
M40
230 V anti-condensation heating
M41
© Siemens AG 2017