Hyd-Mech H-18 ASV, Руководство пользователя, Страница: 38 / 132

3.14 3.15
Auto Cycle Not Being Completed
In auto mode, the PLC controls the 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 the input and output terminals are red LED’s (Light Emitting Diode), which will light up when
the corresponding input is being received or output being actuated. Observation of these input/output LED’s
can help diagnose auto cycle problems. Refer to the 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 if they
are coming on 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, encoder or faulty wiring or connections.
• Wiring for each limit switch should be connected from the VDC terminal connection to the particular
limit switch, and from the limit switch to the input connector of the PLC.
Note:
All inputs are denoted by and “X”
All inputs are denoted by a “Y”
Following is information on output diagnosis and the sequence of inputs and outputs during the 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 the cycle to continue.
a. Head Raise L/S input on – cycle should continue, if not check outputs per step 2.
b. Head Raise L/S input not on – Check that the head up limit switch is being activated. Check the
limit switch/limit switch wiring.
2. Front vise should be closed; the shuttle vise should stay open and move back to the programmed
length.
a. FVC output should be on and SVO output will light momentarily, SHUTTLE REVERSE output
and SHUTTLE FAST output should be on when the shuttle moves back fast.
3. As the shuttle approaches the target length the FST output should shut off and the shuttle should travel
slowly for the DEC DIST parameter, cushion distance. When the shuttle reaches the target length the
SVC output should light and the shuttle vise should close on the material.
4. FVO output light should momentarily turn on and the front vise should open.
5. FWD output should light as will the FST for the shuttle to move forward in fast speed. FST will turn off
when the shuttle home cushion period is reached and thee 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 the blade is not running at this time, auto
cycle will hold until minimum 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 and HUP L/S deactivates.
7. After the cut is completed HDN input should light, HDN output should go out, the HUP output should
light and the head should move up. When the head reaches it’s up limit, HUP input should come on,
RHD output off and the cycle repeats with the next length being clamped on by the shuttle, front vise
opening and the light being brought forward to home position.
As mentioned, beside each input and output terminal there is a bank of red LED’s. Each light corresponds to
it input or output. An input LED will light when it’s specific input signal is being received at the PLC and output