When winding/unwinding paper or film, this equipment varies the excitation voltage
according to the roll diameter, automatically providing constant tension
to a powder clutch/brake. Diameter variation is automatically detected
using a proximity switch, simplifying configuration. This high performance
controller uses a microcomputer which allows storage of a number of
media profiles, and also automatically stores the last output voltage
in the event of a power failure. |
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Features |
1 |
Hunting will not occur during automatic operation due to an open loop control. |
2 |
The integrated microcomputer can store settings for up to 99 different types
of material. |
3 |
Since we store the last output voltage in the in the event of a power failure,
operation can be resumed by simply restoring the power source. |
4 |
In addition of 24V output, there is switchable 0-10V output which can be used
to drive an AC servo motor. |
Operating principle |
Figure 1 shows an example of how the PCD-120B can be used on unwinding equipment.
The thickness of the material, the initial radius of the feed roll,
and the radius of the takeup roll are set in advance and after the
appropriate output voltage is input on the dial, it begins to unwind.
The decrease in unwinding diameter is detected through shaft rotation
and the electromagnetic powder brake's input voltage is decreased
accordingly to maintain a constant material tension. Figure 2 shows
a series of control patterns
●About the rotation detector
The rotation detector outputs one pulse per shaft rotation. The controller
receives this pulse and begins counting at when winding commences(material
thickness x roll shaft rotation number). The current radius is calculated
from the initial radius and the number of rotations, after which the
excitation current of the electromagnetic powder clutch/brake is adjusted
proportionally. |
Dimensional outline drawing |
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Specifications |
Type |
PCD-120B |
PCD-120BM |
Method |
Winding diameter proportional control by roll diameter rotation detection |
Application |
Winding/Unwinding switchable |
Power |
AC100/110V,200/220V,Switchable,50/60Hz |
Output current |
0〜3A PWM Control
0〜10V(10mA) Analog output |
Control resolution |
About 0.5mm |
Response frequency |
Less than 500Hz |
Setting function |
Start roll radius |
3 digits 010〜999mm |
3 digits 010〜999mm
(Note1) |
Stop roll radius |
3 digits 000〜999mm |
3 digits 000〜999mm
(Note1) |
Material thickness |
3 digits 0.01〜9.99mm |
3 digit 0.001〜0.999mm
(Note1) |
Taper rate |
2 digits 00〜99% |
2 digits 00〜99% |
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Display function |
OUTPUT VOLTAGE |
Display on MONITOR |
OUTPUT CURRENT |
ROLL DIAMETER |
DATA NO. |
TAPER RATIO |
AUTO |
Indicator (red) |
STOP |
Indicator (red) |
DATA INPUT |
Indicator (red) |
START ROLL SIZE |
Display start radius settings |
STOP ROLL SIZE |
Display stop radius settings |
MATERIAL THICK |
Display material thickness settings |
Structure |
Steel plate, wall and protective type |
Accessory |
Proximity switch for rotation detection 1 set |
Weight |
5.5kg |
Paint color |
Case Munsell 5Y8/0.5
PanelP2-1007 |
Compatible clutch/brake |
Electromagnetic powder clutch/brake
Less than POC/POB/PRB-20type
(Note 2) |
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(Note)1 |
Up to 99 different data can be set |
(Note)2 |
With the powder clutch/brake larger than type 40, the control is possible by
the connection of operation amplifier PS-6.0A. |
Input terminal connecting diagram |
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