Hyd-Mech M-16A PLC 100 E200, Manual

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3.26 3.27
CALIBRATION PROCEDURE
FOR MITSUBISHI PLC with 2100 series software
Length calibration may be achieved in two ways: by inputting “ACTUAL LTH” (actual length) or “LTH CONST” (length
constant) parameter.
To determine “Actual LTH” value, the “LTH CLB” (length calibration) procedure must be executed.
In manual mode, position a piece of material, which is longer than the shuttle full stroke length (i.e.S20A=29.00”) and
close the front VISE. Simultaneously depress “FWD” & “REV” buttons on the PLC to access parameters. A password is
required at this point, which can be obtained from Hyd.Mech Service Department.
SCREEN WILL DISPLAY:
With the cursor @ shown position (as illustrated above) press . The cycle start button will then start to flash &
“ENTER” will change to “ON” indication self-calibration mode. Start the blade and the trim cut will be made. After the trim
cut is made the head will rise, the shuttle will retract fully in slow speed, clamp the material and come fully forward in slow
speed to the home position and make a cut. After the cut is complete “ON” will change back to “PRESS ENTER”. Measure
the cut part length.
Move cursor down to “ACTUAL LTH” and enter length of cut part plus the actual kerf value. Then exit the parameters by
pressing the AUTO/MAN key (the cycle start button will stop flashing). To determine if the encoder channels are con-
nected correctly, observe the actual length parameter for the sign only during shuttle retraction in calibration mode. If
the actual length value shows as a negative number, then the channels must be reversed and the calibration procedure
repeated.
To determine “LTH CONST” value, use this formula;
LTH CONST = ENCODER PINION CIRCUMFERENCE (TTd) I ENCODER RESOLUTION
Example;
For a 1” pinion diameter and 2500 PPR encoder:
LTH CONST = TTd I 2500 PPR = 0.001257
NOTE:
When first entering the parameters screen if not running the self-calibration do not use the enter key but use the cursor
keys to scroll through the parameters.
To check length control consistency:
1. Perform test cuts of three different lengths (i.e. 1”, 12”, 20”) and measure as accurately as possible with a Vernier
or dial caliper.
2. If the measurements indicate a linear problem (measured length error increases as the programmed length in-
creases), the “ACTUAL LGTH” or “LTH CONST” value will have to be adjusted.
To adjust “ACTUAL LGTH” value The Length Calibration Procedure MUST be performed. This may be done with material
in the machine (cut and measure material length) or with no material in the machine (let machine complete the calibration
cycle, then enter new value).
• If part length error gets longer as the programmed length increases; ACTUAL LTH value should be increased.
• If part length error gets shorter as the programmed length increases; ACTUAL LTH value should be decreased.
• Make small adjustments at a time (i.e. .020” - .030”) and check with test cuts.
To adjust “LTH CONST”, follow this procedure:
Cut length ÷ Programmed length X Existing “LTH CONST” = New “LTH CONST”