Siemens A1 Manuel D’Utilisation
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Real Applications
MICROMASTER Applications Handbook
45
7.6 An
Exercise
Machine
Application
A running machine uses a variable speed drive to control the running belt speed
from a slow walk to a fast run.
from a slow walk to a fast run.
7.6.1 Advantages
· Excellent low speed torque ensures smooth operation even at low belt speeds
with a heavy step.
· Wide speed range makes good use of motor.
· External class B filter meets domestic and light industrial requirements.
· Automatic motor protection due to continuous current monitoring.
7.6.2 System
Specifications
Motor
2.2 kW 230 V 3-phase induction motor
Control
System
System
Microprocessor control system with display, keypad etc.
Drive
MICROMASTER MM420 2.2 kW 230 V
Drive Control
Interface
Interface
Analog and digital input controls, fault indication via output
relays
relays
7.6.3 Application
Details
A 2.2 kW motor drives a pulley and flywheel system via a toothed belt. The motor
is controlled by a 2.2 kW inverter with an external input filter to reduce EMI. The
inverter is connected to the main controller via an analog frequency control and
digital inputs. The digital inputs are used to run, stop and reset invert faults.
is controlled by a 2.2 kW inverter with an external input filter to reduce EMI. The
inverter is connected to the main controller via an analog frequency control and
digital inputs. The digital inputs are used to run, stop and reset invert faults.
The I
2
t function will help protect the motor in this application. Continuous high load
operation is unlikely, but the inverter will trip if the motor is in danger of
overheating. This is acceptable in this application. The fault relay is used to alert
the user of this condition.
overheating. This is acceptable in this application. The fault relay is used to alert
the user of this condition.
Running Belt
Drive Belt
Motor
Display and Panel
Controller
Inverter etc.
Figure 7-6
Exercise Machine