Hyd-Mech M-16A PLC 100 E200, Руководство пользователя

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3.22 3.23
PROBLEM # 3, for P models, disregard all references to a shuttle.
AUTO cycle not being completed
In the AUTO mode, the PLC controls saw functions through output relays. For a certain function to be actuated, the PLC
must first see specific input(s). Like the output relays, the input relays are located on the PLC unit. Directly beside input
and output terminals are red LED lights, which light up when the corresponding input is being received or output is be-
ing actuated. Observation of these input/output LED’s can help to diagnose AUTO cycle problems. See PLC Inputs and
Outputs in this section. When a problem occurs in the AUTO mode, the lights should be checked to see if they are coming
on at the proper time or at all.
INPUT LED’s
- If a specific input light does not come on when expected;
- Check for a faulty/misadjusted limit switch, push button, and encoder or by faulty wiring and connections.
- Wiring for each limit switch should be connected from the VDC terminal connection to particular limit switch, and from
the limit switch to the input connector of the PLC.
NOTE:
• All inputs are denoted by “X”
• All outputs are denoted by “Y”
Following is information on output diagnosis and the sequence of inputs and outputs during AUTO cycle.
AUTO CYCLE SEQUENCE:
After the mode push button is in the AUTO position and the job has been programmed into the PLC, and the Cycle Start
push button pressed:
1. Hydraulics running, the head should move to it’s up limit, if it is not already there. Shuttle vise should open and
come forward to the home position. HUP input light must come on for cycle to continue.
• HUP input on - cycle should continue, if not check outputs per step 2.
• HUP input not on - check that head up limit switch is being actuated, check limit switch / limit switch wiring.
2. Front vise should be closed; the shuttle vise should stay open and move back to the programmed length;
FVC output should be on SVO output will light momentarily, REV output and FST output should be on when the shuttle
moves back fast.
3. As the shuttle approaches target length the FST output should shut off and the shuttle should travel slow for the
“Dec. Dist.” parameter, cushion distance. (i.e. 1.00”) When the shuttle reaches target length, the SVC output
should light, and the shuttle vise should close on the material.
4. FVO output light should come monetarily on and front vise should open.
5. FWD output should light as will as FST for the shuttle to move forward in fast speed. FST will turn off when the
shuttle home cushion period is reached and the shuttle should slow down into the home position.
6. FVC output should light and the front vise should close. FWD light should go out, HDN output should come on
and the head should start to descend for the cut. If blade is not running at this time, auto cycle will hold until
min. SFM is reached. Depending on “Hld Shtl Hm” parameter in the PLC, the shuttle may stay home and closed
during the cut or may move back to pick up the next length. HUP input should go out as the head descends,
i.e. Programmed length = 1.00” Measured length = .999” -0.001” short
= 12.00” = 11.988” -0.012” short
= 60.00” = 59.940” -0.060” short
Existing parameter “LTH CONST”=0.001256
11.988 divided by 12.00 x 0.001256 = 0.001255
The new parameter “LTH CONST” would be 0.001255. This value should be entered as the new “LTH CONST” parameter
and test cuts repeated. Adjust the parameter again if necessary.
GENERAL RULE:
Lowering the parameter value = longer shuttle travel = longer parts
Increasing the value = shorter shuttle travel = shorter par