Boss 8 Error 4000

[HuFlungDung]

Say, have you checked all the wiring to and from the E-stop switch? If you have an open, maybe its shutting off the drives. Could be a seperate (good) circuit on the Estop is used to monitor the state of the switch, and the PLC doesn't see the condition.

[masspfei]

When you push "axis drive enable" the three sping loaded thingys go cachunk. If you push the estop button they go cachunk the other way. Sorry for all the technical data, but its the only way I know how to explain it...

Steven

[machintek]

If the E-stop was pushed in, the control would not attempt to enable the drives. What is happening is that the drives are in a fault state (red LED ON) before the enable. When you enable the drives one small relay enables 3 larger contactors, then the control looks for the lack of a fault signal or the inverse - a ready signal. If all is OK then all stays enabled. If not, the drives are shut down. This is done in less than a second by the FMDC board and is called the ZAP string. The fist monitor will even say that it was shut down due to ZAP. In this less than a second, it is possible to see which LEDs shut off and which one stays on. This gives you an idea as to which axis may be at fault. Then this drive is exchanged with a good drive. If the problem moves, it is the drive board. If it does not, it may be motor or cable related. The control can be fooled by either removing fault lines one at a time, or jumpering 15VDC to each fault line one at a time. I do not remember if the fault is high or low. The faults go to the FMDC through the DLI on individual lines thus the fist monitor should identify which drive is bad as well.

George

[HuFlungDung]

Steven,
If the machine is older and been moved, I would look for the least glamourous problem first: simple old bad connections. With the power off (perhaps for several minutes to allow capacitors and stuff to discharge), go around and pull on every connection. Crimped connections are very suspect after a few years. Then tighten all screw terminals, too.

Use caution around large capacitors. Use pliers with insulated grips to test connections, and keep one hand in your pocket (meant as a principle to prevent current flow through your chest).

Good luck.

[masspfei]

Well, I tried jumpering them with no luck. I am now trying to disconnect wire 17 on each of them to see if that helps.

Steven