1040 Low Hydraulic Pressure

[pinguS]

This alarm seems to be permantly on, even on machine reset. It just started happerning. Can anyone help, its on a Fanuc 18T control.

Machine is a hardinge Conquest T42.

If you keep hold of reset the alarm goes, but the pump does not start up and the alarm returns on letting reset go

pinguS

[Al_The_Man]

I would think you need to find out what is preventing the pump from comming on?
Is it a fuse or contactor overload require resetting?
Al.

[Ozemale6t9]

Where do I start? I am not familiar with this machine but, does the pump run? If not check fuses/breakers. If it runs, does the pressure reach the required level on the pressure gauge? If not, is the motor actually driving the pump. Often motors will shear the drive keys/splines or the pressure relief may be stuck open. If all of the above checks out ok, I would suggest that it is a problem with the pressure switch itself.

regards, Oz

[viorel26]

Alarm "Low Lubr. Pressure- Cycle intrerupted" Fanuc O-TD
If you keep hold of reset the alarm goes.Can anyone help

[L. Sakthivel]

Pingus

check the Hyd. motor Running or not, if not running check the Electrical side first. If Motor is running check the Drive to pump & check the pump output. if pump output is ok, check the Pr. switch wires & pr. switch function.

viorel26
check the above sequence for Lube motor

[Al_The_Man]

Originally Posted by viorel26 Alarm "Low Lubr. Pressure- Cycle intrerupted" Fanuc O-TD If you keep hold of reset the alarm goes.Can anyone help

this can depend on how the lube system is set up, some lube pumps run intermittently and are expected to trip a pressure switch within a certain time span, others run while the machine is in auto/start, so this set up would probabally require the press. sw. seen all the time.
In both cases, check both Lube pressure and P.Switch.
It is probabally a PMC input so it can be checked on the diag or ladder screen.
Al.