Block Diagram - Siemens MICROMASTER Operating Instructions Manual

2. INSTALLATION
2.3.5 Motor Overload Protection
When operated below rated speed, the cooling effect of fans fitted to the motor shaft is reduced.
Consequentially, most motors require de-rating for continuous operation at low frequencies. To ensure that
motors are protected against overheating under these conditions, a PTC temperature sensor must be fitted to
the motor and connected to the inverter control terminals as shown in Figure 7.
Note: To enable the trip function, set parameter P051, P052 or P053 =19.
8
MOTOR
PTC
Inverter Control
7
Terminals
1k
9
Figure 7: Motor Overload PTC Connection

2.3.6 Block Diagram

4.7 k
V: 0 - 10 V
OR
2 - 10 V
–
24 V
+
OR
Power Supply for
PI Feedback
Transducer
or other load.
RL1
Figure 8: Block Diagram
© Siemens plc 1997
+10V
1
0V
2
AIN+
3
AD
AIN-
4
DIN1
5
DIN2
6
DIN3
7
+15V
8
0V
9
RL1B
10
RL1C
11
PE
1/3 AC 230 V
3 AC 380 - 500 V
Jog
CPU
13
SI
L/L1, N/L2
PE
or
L/L1, N/L2, L3
~
P
RS485
~
3
PE U, V, W
M
English
G85139-H1750-U049-B
26/09/97