MetalTech Jobber Plus, Instruction Manual

Page: 14 / 24

Page - 14 J o b b e r P l u s M T C C
Adjusting the STOP MAX
If after operating the machine you find that the stopping time is higher than determined
by the test (usually caused by the normal heating of the brake lining during use), you can
adjust the setting by entering the SETUP menu as previously described and selecting func-
tion CHANGE STOP MAX. A new screen will appear. Change the stop max value to the
highest stop time you have been getting plus 10% . Remember to move any light curtains,
operator stations, etc. to the new safe distance as required by OSHA.
Setting and Adjusting Lost Motion Detection
The lost motion function is used to determine if the E-CAM is functioning properly. E-CAM
failures can have several causes. A broken chain drive. A chain sprocket could be slipping
or the cable and even the E-Cam itself could be defective.
The reason the lost motion time can be programmed is because every machine has some
delay before it starts moving after the press is initiated. Obviously the quicker any of these
errors are detected the safer the machine will be. If the factory default of 350 milliseconds
causes lost motion faults. Try setting the time to 450 milliseconds. Test cycle the machine
several times. If there are no lost motion errors, reduce the time by half. If there is a lost
motion error, increase the time by half and test cycle the machine. Continue until you obtain
the lowest possible setting without causing a lost motion error.
To adjust the setting enter the SETUP menu as previously described and select the function
SET LOST MOTION. A new screen will appear. Change the value as described above.
! WARNING ! Setting the lost motion time too high could result in personal injury!
MTS (Machine Test Signal)
As a additional light curtain safety check the light curtain’s output (relays) can be checked
once during each stroke of the machine. The purpose of this test is to be certain the light
curtain relays are working properly. Should the relay contacts weld closed the machine would
not stop if the light curtains are interrupted during the downward portion of the stroke.
Some light curtain manufacturers do not have this input function. If they don’t, we would
advise against buying this type light curtain. However, if you have a set of light curtains
without this function, the control will accept a light curtain interrupt caused by the operator
or the part breaking the beam during the up stroke of the machine. Most operations cause
this to happen anyway. This function can be turned off, however, it is very strongly recom-
mended that it is left on for safety.
NOTE: If the machine cycles 500 or more strokes per minute and the light curtain relays are
slow you could get MTS faults. In this case you will have to turn the MTS function to off.