Hyd-Mech H-22A, Operation And Maintenance Manual

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Pg 3.8
H22
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:
For semiautomatic "P" models, refer to the PLC key description of in Section 2A.
For automatic models;
In manual mode, with front vise switch in 'CLOSE' position press FWD. and REV buttons 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 3.20. 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.
P