M8 Not Turning on Coolant Pump

[dkaustin]

I've replaced the original Tormach coolant pump with a more powerful (1/6 HP) pump to give more flow with a dual nozzle setup. The new pump is plugged into the controlled pump power outlet on the bottom of the control cabinet.

M8 does not start the new pump, however. I can start it and stop it just fine manually.

Any idea what's going on? Some kind of current-limiting protection kicking in, maybe?

[Magnum164]

I've replaced the original Tormach coolant pump with a more powerful (1/6 HP) pump to give more flow with a dual nozzle setup. The new pump is plugged into the controlled pump power outlet on the bottom of the control cabinet.

M8 does not start the new pump, however. I can start it and stop it just fine manually.

Any idea what's going on? Some kind of current-limiting protection kicking in, maybe?

Does the coolant switch have to be in Auto? I know I tried to turn on the coolant with the screen command in M3 the other night and realized I have forgot to set the coolant switch back to Auto.

[dkaustin]

Yep, when the switch is in "Auto", there's no response. I have to turn it on by switching to "Manual."

[Don Clement]

First you should connect the pump up to an independent 120VAC source to see if your new pump works without the Tormach.
Next you should measure using a voltmeter the voltage on the switched coolant outlet under no load ( pump not plugged in). There should be a 120VAC present when M8 is used and manual coolant switch set in AUTO position or with the manual coolant switch in ON position if the Tormach coolant swiched outlet is working correctly. There might be a current limit problem when there was voltage present measured at the switched coolant outlet under no-load (pump not plugged in) and then no voltage or less than the 120VAC measured at the switched coolant outlet with pump plugged in (under load).

Don

[twocik]

Put it into auto mode and try typing Control + the C key on the keyboard. See if this works first

[Don Clement]

I've replaced the original Tormach coolant pump with a more powerful (1/6 HP) pump to give more flow with a dual nozzle setup. The new pump is plugged into the controlled pump power outlet on the bottom of the control cabinet.

M8 does not start the new pump, however. I can start it and stop it just fine manually.

Any idea what's going on? Some kind of current-limiting protection kicking in, maybe?

So did you find the problem? Was it a current limit issue? I would like to know if its OK to install a more powerful pump on the Tormach. Thanks in advance.

Don

[twocik]

More like a larger tank !

[Don Clement]

More like a larger tank !

Was the larger tank the current limit problem and fix M8 not working?

[Scott_M]

I am pretty sure that the M8 command is handled by a relay on the main control board and the "Manual" switch handles it directly.
If M8 does not work ( and manual does ) you may have smoked the relay on the main control board. I would check with Tormach to confirm this. The board is not cheap. How are your surface mount soldering skills ?

Scott

[Don Clement]

How are your surface mount soldering skills ?

Scott

My surface mount soldering skills are excellent however we haven't heard from the OP if the problem of using the larger pump was really resolved.

Don

[Magnum164]

I am pretty sure that the M8 command is handled by a relay on the main control board and the "Manual" switch handles it directly.
If M8 does not work ( and manual does ) you may have smoked the relay on the main control board. I would check with Tormach to confirm this. The board is not cheap. How are your surface mount soldering skills ?

Scott

You would think there would be a fuse or replaceable link in there somewhere.

[dkaustin]

The pump is popping the 1A fuse on the machine control board.

The relay is OK; I hear it clicking in/out on M8/M9.

I'll check with Tormach before I put in a beefier fuse. In the meantime, I'll continue to run the coolant manually-- no big deal, really.