Siemens A1 Manual De Usuario
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Real Applications
MICROMASTER Applications Handbook
39
7.3
Controlling Lift Door Operation
Lift doors need to close at varying speeds. Starting slowly, accelerating fast and
slowing again as they approach closure. In this case, the doors are held closed by
the motor running at low frequency at zero speed. The load can vary considerably
due to mechanical changes as the lift moves, and variations in door weight as
external doors are operated as well. A very good result has been obtained using
micro switches to select the various speeds.
slowing again as they approach closure. In this case, the doors are held closed by
the motor running at low frequency at zero speed. The load can vary considerably
due to mechanical changes as the lift moves, and variations in door weight as
external doors are operated as well. A very good result has been obtained using
micro switches to select the various speeds.
7.3.1 Advantages
· Very simple system provides the desired speed profile. Doors operate smoothly
and silently.
· Torque at zero speed holds doors closed.
· Speed profile can be easily adjusted.
7.3.2 System
Specification
Motor
4 pole 80 W 230 V 3-phase induction motor. Oversize with no external
cooling fan - allowing zero speed operation
cooling fan - allowing zero speed operation
Control
System
System
Two Microswitches selecting fixed frequencies; open/close signal on
third digital input
third digital input
Drive
MICROMASTER MM420 750 W 230 V
Note.
The following diagrams and tables refer to settings and parameters used on
MICROMASTER MM420. Settings for MICROMASTER MM440 may be different.
The following diagrams and tables refer to settings and parameters used on
MICROMASTER MM420. Settings for MICROMASTER MM440 may be different.
Door to Close
Sensors
Door Closes Fast
Door Slows
Door Closed
DIN 1
DIN 2
DIN 3
Output
Sensor 1
Sensor 2
Open/Close
0
0
1
5 Hz
1
0
1
25 Hz
1
1
1
10 Hz
0
1
1
2 Hz
0
1
0
- 6 Hz
1
1
0
- 15 Hz
1
0
0
- 5 Hz
0
0
0
Stop
Function
Close Slow
Close Fast
Slow Down
Hold Closed
Open Slow
Open Fast
Slow Down
Stop Open
Figure 7-3
Lift Door Operation