Pg 39 S22A / S23A mits 2001
PROGRAMMABLE LOGIC CONTROL, MITSUBISHI 100
NOTE: The PLC is equipped with a lithium battery to keep the program stored while the power is shut down.
The battery will need to be replaced every 3 to 5 years, depending on usage. A visual warning will be displayed on
the interface when the battery drains to a certain level. Battaries can be purchased through your Hyd-Mech
Distibutor.
The programmable length control (PLC) uses signals from limit switches, control panel switches, an encoder
(rotary shaft or linear) and information which is programmed into it, to supply accurate automatic length control and
sawing functions.
The inputs used include;
- a head up limit switch, a head down limit switch;
- the machine function switches & push-button
- also a signal from the auto/manual push button (telling the PLC whether auto or manual
operation has been chosen).
An encoder is attached to the shuttle assembly and travels with the shuttle to provide length information to the
PLC. A proximity switch and target, mounted to the gearbox drive pulley or behind idler wheel, provides blade
speed input to the PLC.
The programmed information includes logic put into the PLC be its manufacturer, as well as information
programmed in, through the keypad, by the assembly plant. Information from the assembly plant is referred to as
the parameters. The parameters are important for the PLC to provide accurate sawing lengths and blade speed
display. Following is a description of each parameter and the procedure to access them.
To view the PLC parameters:
In manual mode, with front vise switch in 'CLOSE' position press FWD and REV keys simultaneously (not more
than 0.5 sec. apart). The PLC will prompt for a password which is obtainable from Hyd-Mech Saws. If the password
is correct a screen of parameters will appear. The display will show two lines of parameters at a time. The first
display is for the machine's self calibration of it's length control. If the length control calibration is necessary, follow
the calibration procedure on page 48. To move through the parameters use the cursor keys to scroll up or down. To
change a parameter, cursor to that parameter line, and, using the number keys, type in the new value and press
enter. To leave the parameters press the Auto/Man key. The following page lists the available parameters and their
definition.
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