Siemens 1LG0 Installation And Maintenance Manual page 9

Protection
1LG0 motors have two types of electrical protection available as an option:
• PTC - used for temperature alarming or tripping function
• PT100 - used for alarming or tripping function
Note
: Both the PTC and PT100 require connection to an external control unit.
When PT100s are used for bearing temperature monitoring, the alarming
Warning! Warning!
and tripping values are independent of those of the winding class.
Aux terminal Connection
If the motors are confi gured with the options A11, A12, A60, A61, A72 or K45, the
auxiliary terminal connection is shown in Table 2.
Table 2
A11 A12
PTC PTC PTC
T1
C1 C2 C1 C2 C3 C4
T1
Motors which are exposed to a wide temperature fl uctuation during standstill are
susceptible to condensation formation, hence it is strongly recommended that a space
heater be added.
Warning! Warning!
The space heater must never be energised during motor operation.
A60
U V W
U1
T3 T5 T1
T2 T4 T6
T3 T5 T1
A61
U V
U2 V1 V2
T7 T3 T9
T2 T8 T4
T7 T3 T9
Thermometers
W
rolling-contact
bearings
W1 W2 DE
T T
T5
11 13 T
T T
T6
10 12
T T
T5
11 13
A72 K45
for
Heater
NDE
T
15 T
P1 P2
14 16
T
15
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