Safeline Signature, Operating And Instruction Manual

Page: 110 / 168

OPERATING INSTRUCTIONS
94 4618-021
tm3[G] TIMER - NON GATED MODE
!
CAUTION
Ensure you have read the REJECT TIMERS
INTRODUCTION section on page 78
Introduction
The tm3 timer is used on variable speed product lines
or product lines that may be stopped or started by
external equipment.
The tm3 timer when used in the non-gated mode is
ideal for use with loose product where the reject
device is situated some distance from the detector.
This timer is also suitable for use with packaged
products but is not as accurate as the gated version,
tm3G.
NOTE
Remember to record all settings on the Settings
Sheets at the rear of the manual.
This timer type is suitable for reject devices which
include plough-action diverters, retracting bands etc.
Setting up Timer Type tm3
The display opposite may be used to either:
1) Select which timer group the current product
number should use,
or,
2) Select which timer group the current product
number should use AND adjust the timer group
settings such as timer type, reject shift, signal
shift etc.
NOTE
REMINDER
If you have already selected the timer group and
pressed YES to updating the group, as per the
Engineer Mode section earlier, then proceed to
step 3).
1) Press the soft key adjacent to the required group
letter, A, B or C.
NOTE
EXPLANATORY NOTE
The tm3 and tm3G timer modes continually refer to
terms such as 'SIGNAL SHIFT', 'REJECT SHIFT',
'SYNC SHIFT' etc. The word shift when used in these
context refers to the distance the product will move (or
shift) between successive pulses on the speed sensor
input. Thus if a speed sensor has a shift of 10 cm
then a REJECT SHIFT of 5 is equivalent to a product
moving a distance of 5x10 cm = 50 cm.
For instructions on calculating the shift distance for
your application refer to Appendix A.
tm3 settings
1) Signal Shift
This is the number of speed sensor pulses taken
for a metal contaminant to travel from the
detector to the reject device.
2) Reject Shift
This is the number of speed sensor pulses
required by the reject device to reject the
contaminated product.
The currently selected timer group will be indicated by a flashing
cursor appearing over the group letter.