Drives can not be switched on

Fault:

System 840D had run up and basic screen appeared. But the drives could not be on. There was an alarm: Stop No Mode Group Ready.

Remedy:

There is description about Mode Group on the operating manual of 840D. This machine only has one mode group. The alarm can be thought of as the machine is not ready.
While checking, the machine went well sometimes, but bad in other times, irregularly. When pressing the push button Drives On (S45.6) found the status of E45.6 (on the display of console) changed to “1” from “0”. It  showed that the PLC had received the signal sent by the push button through the emergency stop circuit.
According to the electrical schematic diagrams, holding down the button Drives On and checking voltages with a multi-meter, found that there was a 24V voltage of the pin 21 of the relay K17 (page 218) relative to the pin A2 of the relay A170. But pin 22 not. So doubted K17 malfunction. Exchanged K17 and K9 (the same model, optional, not used in this machine) and tried. The machine restored to normal.

 

4 comments on “Drives can not be switched on

  1. Those are yours alright! . We at least need to get these people stealing images to start blogging! They probably just did a image search and grabbed them. They look good though!

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