I show you : How to use datasheet and make test circuit ?
Your datasheet.............................
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Look installation...........
View attachment 63797
Measured force direction vertical downwards.
Look Schematic and electrical data.....................
View attachment 63798
If measured with ohm-meter >> Gage Resistance: 350 ohm
Making test circuit....................
Excitation Voltage: 10 Vdc nominal
Output Signal: 21 mVdc nominal per load cell at full load rating
Cable Connector: PT01P-10-6P-SR; MAGPOWR mating cable assembly
part number SC15, or mating connector 12A36-1
(pin A, + power; pin B, + signal; pin C, -signal; pin D, -power)
That is all you need, now make circuit for testing................
View attachment 63799
Look force you need for test....................
View attachment 63800
You find out GTSA50M >> 50 kg = full load >> then Output Signal: 21 mVdc nominal
So when vertical force down is 50 kp then meter should read 21 mV
25 kp >> 10.5mV ; 12.5 kp >> 5.25mV .... etc.
And everything found on datasheet, i think : it was not so hard.
Regards KAK
I quess system is somenthing like this............
What is the principle the dancer rollers tension measure ; is there swing arm for sensing angle with pot.meter or ????
Anyway it seems that infeed roller is not in right angle compared to web line
(and) or pot.meter zero offset is not right. ( is pot.meter mechanically in right position). Then measuring roller is not right position.
Can be mechanical fail in bearings, fixing parts are not ok or some reason moving assembly is too heavy to move.
First try to find out , why web-line is not perpendicular to roller.
If there is brake in infeed, check brake adjustment and braking force and brake control action with PLC control signal
Check is pot.meter zero offset correct. and Pot.meters do not have dead zones , ie. points where signal suddently jumps. (Bad contact inside pot. )
Careful check all mechanics in control system, everything can move freely ( non stuck parts).
Check is there any bad or broken wires or bad contacts.
I hope somebody have not change any PLC parameters for web control
You should show me , how the measure and control system is mechanically done and exact machine electric block diagram for machine control,
for better analyze and advices.
KAK
How to check pot. meter zero offset is correct ?
How to test/check brake adjustment and braking force and brake control action with PLC control signal ?
How to check or how to get to know that " infeed roller is not in right angle compared to web line " ?
What about these modules EM 235 CN, EM 232 CN & EM 222 CN
This means angle of dancer-swing arm when pot.meter signal value that is corresponding to the zero control for PLC.
These values should be found in service manuals of control system.
(This means that changing angle position of the pot in arm mounting, the control system change angle position of the arm
during machine run.)
there are two principle for web tension control:
1. set arm opposing force manually (in this machine with air-pressure) and control web-brake with PLC
2. set brake force manually and control web-tension with PLC and motor inverter ( by controlling speed of drive motor).
- angle of the swing-arm with potentiometer measure web-tension for plc control
System can be used in infeed or outfeed
View attachment 64165
opposite system has brake instead motor (running from right to left) ( most left roller is unwinding )
-it depends, how web cross position (sideways) is controlled in maschine.
( control with unwinding roll cross position or with changing cross angle in some roller)
Analog module EM 235 page 45...
Analog module EM 232 page 44...
Digital module EM 222 page 30...
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Does this mean , that this machine controls web cross-position by moving in-feed and out-feed reels sideways.the problem now is that the machine runs perfectly till the speed of 66 m/min , beyond that the same problem starts (the out-feed reel stuck to a position i.e. to the right & digital indicator shows + 9 on the scale from -10 to +10 ) ...... and to keep running on that speed the production losses are crept up ....
Don't you think that the frequency (speed) of all the inverters should be equal so that the tension on the web remains fine ?
No. Most important is that they are properly sized and setting the values (parameters) are correct for the motor and control system.Don't you think that all the inverters used, should be of same manufacturer
Drives are sized for motors and if braking power is high enought, braking unit is needed.Why there's a bigger (larger) inverter used in this process
what do you mean by offset value ?
Setpoint value for tension depended inverter is master speed set value plus offset value .
Offset is calculated correction value for controlling tension in web
I could not find any documents or information about this machine
in order to be able to answer questions,
I need to know the machine structure and see the control block diagram
Do not alter the factory settings, because all the control parameters are dependent on
one another.
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