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TB043 Rev2 Connecting a TT 1/TT 2 or DP 4/DP 7 Probe and Potential TT 1
Field Issue
Overview
The connector plug on the following Centroid probes are correctly wired for the DIGITIZER PLUG
input located in the Magnetics
Cabinet The most common mistake is to connect a probe into the MPG socket This document will also cover a potential TT 1 problem
out in the field that could lead to other problems Â
Install
Plug the following probing devices into the Digitizer Plug
input as shown in the diagram below
TT 1 or TT 2 = Tool touch off block
DP 4 or DP 7 = Digitizing probe
** WARNING DO NOT PLUG THE TT 1 TT 2 Â DP 4 ORÂ DP 7 INTO THE MPG INPUT! **
Setup and Operation
Refer to Chapters 4 and 8 of
the M Series operator manual for information on setting up and using the TT 1 and TT 2 Tool Touch off
block or the DP 4 and DP 7 probe
As of CNC7 v8 22 the TT1 or TT2Â has its own parameter 44 so that you can wire a second connector for the TT1 or TT2 and leave it
connected all the time
Important Note
If your TT device does not have a separate connector make sure parameter 44 is set to 0 before using your TT1 or
TT2 You will
crash your TT device if P44 is set to
a non zero value and it's connected to the standard connector on the electrical cabinet
Â
Potential Problems
Coolant conductive /chip buildup on and around the TT 1 can cause false trips
Stale dirty or "sour" coolant makes the short intermittent which can overload the PLC and cause other erratic symptoms
The buildup only has to be approx 2kohms to cause problems
Intermittent grounds can cause erratic operation and possible static or noise buildup which in extreme cases come back
through the encoders and take out the motion controller card
Tooling or spindle bearings are not conductive
Solutions
Cover the TT 1 when not in operation or remove from the worktable
If the TT 1 has a buildup clean the TT 1 with a scotch brite pad
Purchase a TT 2 to eliminate conductivity issues
Document History
Rev2 Created on 2011 11 02
by #270
Rev1 Created on 1999 09 09
by #326