Safeline Signature, Operating And Instruction Manual

Page: 94 / 168

OPERATING INSTRUCTIONS
78 4618 - 021
REJECT TIMERS INTRODUCTION
NOTE
Remember to record all settings on the Settings Sheets at the rear of the manual
Recommended Applications
Listed below are various types of reject mechanisms
along with the recommended timer type for the
mechanism. For variable speed applications
substitute timer type tm3 for tm2 or tm3G for tm2G.
TIMER TYPE
tm1 tm2 tm2(G)
Timed Audible Alarm OK N/A N/A
Conveyor Stop OK N/A N/A
Gravity Fall Systems OK N/A N/A
Instant Reject with
Timed Reject Period
OK N/A N/A
Retracting Band N/A OK N/A
Air Blast N/A OK
Preferred
Punch/Pusher N/A N/A OK
Drop/lift Flap N/A OK
Preferred
Plough action diverter N/A OK OK
Flip action diverter N/A N/A OK
Note. N/A = Not applicable for this reject
mechanism
Timer Groups A, B or C
The engineer may allocate different timer types and
settings to group A, B or C, only three selections are
allowed. In general only one timer type and setting
will be required for all applications.
For applications with a greater than
±
25% variation in
pack length or for those operating at different speeds
it may be necessary to have different timer settings for
the different timer groups. The different timer settings
may then be selected as required.
Both timer group selection and timer type setting may
be made in the Engineer Mode but only timer group
selection for a product number can be made from the
Supervisor Mode.
Important notes for timer setup
Sample size selection
Small size metal contaminants should be used during
the setting of the timers; the use of large
contaminants will produce errors in the settings.
Use the smallest metal sample that can be detected,
this should give approximately 2 to 3 red LED’s on the
bargraph.
If this is not possible use the smallest sample
available and adjust the sensitivity setting so that the
metal contaminant gives a bargraph indication of
approximately 2 to 3 red LED’s.
Product presentation
Sample products or product packs used to set up the
timer should be passed through the detector aperture
at their normal speed and without skewing or slipping.
Pack length limitation for packaged products
Where a variety of individual products with differing
lengths are being monitored ensure that for a
particular timer group the variation in pack length
does not exceed
± 25% of the pack length used to set
the timer.
If the variation in pack length is greater than ± 25% of
the length used to set the timer then a different timer
group should be used for those packs that fall outside
the limit.
REJECT
MECHANISM