Today, to the customer to repair a machine, before the price has been negotiated, the salary is 200 yuan, if the maintenance needs to replace the accessories, the cost of the accessories is calculated.
This is an automatic tapping machine with two motors and several cylinders on it. Here's its accessory box. A Mitsubishi PLC was used.
Now let's send a power to try it and see what the problem is.
As soon as the power is sent, the servo motor will automatically return to the origin, which is set by the program, don't worry about it, most equipment has the function of returning to the origin.
Before coming, the customer told me that the tapping cylinder does not move outward, so let's start the equipment first and see what the problem is. Normally, the second motor should be forward, but the motor is not turning, it is this motor.
Explain that this cylinder has no action, find the solenoid valve and try it manually to see if this cylinder is broken, there is no problem, the cylinder can move forward and backward normally.
The limit switch indicator on the motor is also on, which should be good under normal circumstances.
Just in case, check again if the input indicator of the PLC is on. We see that the input value of the PLC is that the light is on, indicating that there is no problem with the limit switch.
Let's find out where the coil wire of the solenoid valve is connected, and where the power supply is connected. This wire is the line of the solenoid valve. This wire is connected to the Y6 of this terminal strip, which means that it is the Y6 output of the PLC.
Restart it again after a while, and see if the Y6 of the PLC has an output to determine whether the solenoid valve is broken, or the PLC has no output.
Power the machine back on, press the start button, and the device starts running. Now just keep an eye on the Y6 output light to see if it's on. If there is an output, the indicator light of Y6 will be on. It can be found that the indicator light of Y6 is not on, which means that the Y6 of the PLC has no output, which is generally caused by the fact that the conditions of Y6 output are not met.
Reboot again and see what the action is running. Start to punch the first hole, then the second hole, the servo motor retreats, and the small cylinder feeds. When the small cylinder is feeding, the magnetic switch in front of it is not energized, and its indicator light is not on.
Manually let the cylinder move, it can be clearly seen that the magnetic switch in front is not energized. This small cylinder has a magnetic ring inside. When the magnetic switch detects the magnetic ring, the light is on, and now the cylinder is not moving, so the magnetic ring is at the bottom, and the indicator light is already on, indicating that the magnetic switch is good.
When running automatically, the cylinder is energized to push out the screw cap, but the limit switch does not detect that the cylinder is pushed out. The tapping motor does not move.
After repositioning the magnetic switch, I restarted it and tried it. There will still be probes that are not detected. I suspect there is something wrong with this cylinder and plan to replace it. I removed the cylinder from another machine and put it on this machine. Power on again, so that there is no problem and the work can be done normally.
This small probe plays a great role, to detect that the cylinder is back in place, the PLC receives the signal, it will follow the action, now the first cylinder does not detect the reset, the second cylinder will not act, in this way, today's maintenance work is completed.
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