KEB combivert f4 inverter problem

[ifancho 0]

Hello everyone.
I have a problem with a KEB combivert F4 inverter. When the machine is off the inverter keeps going constantly backwards with speed '-0.3' and status 'rcon' on the display and i cant find a way to stop it.

[pturmel 135]

Uhm, cut the power to the inverter, too?

But seriously, it seems the remote control circuits were not designed in a fail-safe manner (wire or power cuts == stop).

Show the schematic.

[ifancho 0]

[pturmel 135]

Look at contactor 5KM2.  Its coil should de-energize when power is cut.  Verify that it isn't powered by something else.  Also check if one or more of its contacts have fused (failed closed), preventing its mechanism from opening when power is cut.

[ifancho 0]

I will check it. Thanks 

[ifancho 0]

I havent get the chance to check it but this 5km2 contactor is suppose to stay energized, only the inverter have to stay with noP on the display - No operation. But for some reason it does not.

[pturmel 135]

1 hour ago, ifancho said:

this 5km2 contactor is suppose to stay energized

I would call that a design flaw.  You have no other contactor between the power source and the motor.