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Real Applications

7.5A 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.

7.5.1Advantages

·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.

7.5.2System Specifications

Motor

550 W 230 V 3-phase induction motor.

Control System

PLC

Drive

MICROMASTER MM420 550 W 230 V

Drive Control

Analog input control, brake control and Motor temperature

Interface:

protection

7.5.3Application Details

Each machine is controlled by a PLC which controls the inverter via an analog input and digital controls.

 

 

MICROMASTER

PLC

 

 

7

 

 

Motor

Temperature

Digital

 

Analog Input

 

Input 3

 

 

Sensor

 

 

3

 

 

 

 

 

 

 

 

 

 

8

4

 

 

Eletromechanical Brake

 

 

 

 

with external supply

 

 

Digital Inputs

 

 

 

 

 

+24 V

10

 

1 and 2

 

 

RL1

5

 

 

 

6

 

 

 

11

 

 

 

 

 

 

0 V

 

2

 

 

 

 

 

Figure 7-5

Material Handling Application

 

 

MICROMASTER Applications Handbook

43