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Real Applications
MICROMASTER Applications Handbook
41
7.4
A Conveyor Application using several MICROMASTERs
MICROMASTERs are used to control short conveyors. Each conveyor is used as
a holding point while products are sorted. The products are moved forward by
rapid acceleration of the conveyors under computer control.
a holding point while products are sorted. The products are moved forward by
rapid acceleration of the conveyors under computer control.
7.4.1 Advantages
· Controlled acceleration rates ensure product is moved as fast as possible
without damage.
· No direct on line switching of motor; no shock loading or current inrush.
· Drive status and parameters can be continuously monitored via serial link.
· Settings can be changed via serial link.
· Small size allows drive and control system to be mounted under conveyor and
close to motor.
7.4.2 System
Specifications
Motor
750W 400V 3 phase induction motor.
Control System
Custom computer system communicating with central controller.
Drive
MICROMASTER MM420 750W 400V
Drive Control
Interface
Interface
Digital input control with 1 or 2 fixed frequencies, alternative
ramp rate selection, output relays.
ramp rate selection, output relays.
7.4.3 Application
Details
Up to five inverters and motors are used in conjunction with five conveyors and a
local computer controller. Three are shown below. The computer is used to set
the parameters and to monitor drive operation. Actual control and fault monitoring
is via the digital inputs and relay outputs. This example uses a BiCo (Binary
Connector) function which connects digital input 3 to the ‘Select Jog Ramp times’
functions. For the second conveyor controller shown below the faster ramp times
and second fixed frequency can be selected using digital inputs 3 and 2, connected
to the control relays as shown in Figure 7-4.
local computer controller. Three are shown below. The computer is used to set
the parameters and to monitor drive operation. Actual control and fault monitoring
is via the digital inputs and relay outputs. This example uses a BiCo (Binary
Connector) function which connects digital input 3 to the ‘Select Jog Ramp times’
functions. For the second conveyor controller shown below the faster ramp times
and second fixed frequency can be selected using digital inputs 3 and 2, connected
to the control relays as shown in Figure 7-4.
Figure 7-4
Conveyor Application
14 15 PE
10 11
RS485
RL1
I/Ps: 7 6 5
2 (0V)
14 15 PE
10 11
RS485
RL1
I/Ps: 7 6 5
2 (0V)
14 15 PE
10 11
RS485
RL1
I/Ps: 7 6 5
2 (0V)
Fault Loop
RS485
System 0V
System 0V
System 0V
Run Relay #1
Run Relay #2
Run Relay #3
High Speed Relay
High Acceleration Relay
High Acceleration Relay
Inverter/motor #1 - Transfer Belt
Inverter/motor #2 - Load Belt
Inverter/motor #3 - Feed Belt
Monitor