Siemens A1 Manuel D’Utilisation
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Real Applications
MICROMASTER Applications Handbook
43
7.5
A Material Handling Application
Several MICROMASTERs are used to handle sheets of large, fragile pieces of
material. The system is controlled by a Programmable Logic Controller (PLC)
using the digital and analogue inputs. Relays are used to control the DC Brake.
material. The system is controlled by a Programmable Logic Controller (PLC)
using the digital and analogue inputs. Relays are used to control the DC Brake.
7.5.1 Advantages
· Electromechanical brake controlled directly from inverter with fail safe control.
· Analog and digital outputs from PLC easy to set up and monitor.
· An overtemperature switch is used to detect the overheating of the motor rather
than a PTC.
· Boost during ramp up ensures good torque at low speed.
· Smooth operation with controlled ramp rates ensures material is not damaged
during handling.
7.5.2 System
Specifications
Motor
550 W 230 V 3-phase induction motor.
Control System
PLC
Drive
MICROMASTER MM420 550 W 230 V
Drive Control
Interface:
Interface:
Analog input control, brake control and Motor temperature
protection
protection
7.5.3 Application
Details
Each machine is controlled by a PLC which controls the inverter via an analog
input and digital controls.
input and digital controls.
MICROMASTER
PLC
Motor
Temperature
Sensor
Eletromechanical Brake
with external supply
+24 V
0 V
7
8
10
11
3
4
4
5
6
2
2
Digital
Input 3
RL1
Analog Input
Digital Inputs
1 and 2
Figure 7-5
Material Handling Application