The simple answer is, in normal operation home switches are meant to be
activated. Limit switches are not.
When the machined is commanded to reference (or "home") the machine, the
software moves the machine towards the home switches until they are
activated. The software now knows where the machine is.
The limit switches should only be activated if something is wrong and the
machine has travelled too far. This is how your machine is wired.
Mach1/2 allows the home and limit functions to use the same switches.
If you tell the machine to "Reference" then the software is expecting the
switches to e activated. It therefore treats the switches as home switches
and nudges the machine off the switch.
During normal operation the switches are treated as limit switches. If
activated, the software stops the machine in an ESTOP operation.
So, if you want to use the referencing feature of Mach1/2 you have two
options.
1 - Install a 2nd set of switches for the home switches.
2 - Rewire your machine so that the limit switches are not in series with
the big red button.
Cheers,
Peter Homann
mailto:Peter.Homann@...
Adacel Technologies Limited,
250 Bay St, BRIGHTON, 3186, AUSTRALIA
<>
Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960
Mobile 0421-601 665
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-----Original Message-----
From: bob_quale [mailto:Robert.Quale@...]
Sent: Wednesday, 13 August 2003 10:38 AM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Limit switches and home switches
I'm not sure the difference between limit and home switches. I have
a bridgeport with limit switches, they are in series with a mushroom
switch. If one is off, it kills the power to the power supply for
the motors, via a contactor, stopping all motion. I then have a over
ride to jog off the switch. Where do the home switches come into
play and how do they work?
Bob
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