The alarm appears more frequently. Sometimes it disappears by itself, but sometimes it takes a lot of twists and turns. If it is troublesome, can deal with it according to the following procedures:
1. Following the pallet exchange process(see “Alarm 700101+ and oil spill from rotary table”), manually poke the solenoid valve to fulfil each step in sequence. Make a moderate effort to make the lamp light. Can observe the PLC status on the screen to make sure that it is in place. Considering safer, you can poke a valve with another person observing. Press the emergency stop in case of emergency. Can also unload the pallets in advance. This procedure can generally eliminate alarms.
2. If the alarm still exists, reinstall the PLC. If the small door for tool exchange is not closed, can perform manually axis X return to the reference point. After that the door will fall automatically.
Here are two examples.
Alarm: 700112 Pallet changer not in basic position.
Following the pallet exchange process found E36.4(pallet changer in 0° position) and E36.5(pallet changer in 180° position) were both “0”. Turned in clockwise a little bit the proximity switch and cable corresponding to E36.5. Orange light and yellow green light were lit at the same time. Restart the machine, the alarm was eliminated.
The machining process was interrupted randomly by the alarm 700112. Normal after shutdown and restart. Sometimes the frequency is nearly 1 times per hour.
Following the pallet exchange process, checked PLC status and found that E36.2(Pallet clamped on rotary table) was changed from “1” to “0” when the alarm appeared, and E36.3(Pallet unclamped on rotary table) was always 0″.
A40.2 was “1”, indicating that the system had given the locking signal, the solenoid valve Y40.2 indicator light had been lit, but the corresponding pressure switch S36.2 may not give a signal, making E36.2 become “0”.
Checked and replaced S36.2, the alarm was completely eliminated.