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2. INSTALLATION
2.2.5.
External Motor Thermal 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 2.2.5.
Note:
To enable the trip function, set parameter P051, P052 or P053 =19.
8
MOTOR
PTC
Inverter Control
7
Terminals
1kΩ Ω Ω Ω
9
Figure 2.2.5: Motor Overload PTC Connection
2.2.6
Block Diagram
≥ ≥ ≥ ≥ 4.7 kΩ
V: 0 - 10 V
OR
2 - 10 V
–
24 V
+
OR
Power Supply for
PI Feedback
Transducer
or other load.
RL1
Figure 2.2.6: Block Diagram
© Siemens plc 1999
+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
P
CPU
17
SI
L/L1, N/L2
PE
or
L/L1, N/L2, L3
~
RS485
~
3
PE
U, V, W
M
G85139-H1750-U049-C1
English
19/08/99
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