CTM 360a series, Руководство по техническому обслуживанию и ремонту, Страница: 30 / 176

360a DISPLAY
3-18
PRODUCT SETUP (cont’d)
(ENCODER OPTION)
The Applicator has a differential quadrature incremental encoder interface with times four interpolation
built into the controller board. The Encoder Connector, located on the rear panel, has 5 VDC supply to
power the Encoder. The Encoder wiring diagram and pin-out information appear in the drawings section in
this manual and should be consulted for user supplied encoders. Factory encoders generate 2500 pulses per
revolution.
The following parameters may be changed
or monitored in this section:
Encoder Filter
Encoder Option On/Off
Encoder Speed (monitor)
Pulse Length
Compensation
Encoder Filter – In some applications, the Encoder speed varies significantly around some average value.
This is especially problematic with Merge applicators, low-resolution Encoders and low conveyor speeds
where fewer encoder pulses are captured during the velocity calculation interval. The Encoder Filter
function allows the operator to average the Encoder Speed over a range of 1 to 10 scans to produce a
smoother label dispense. As with all filters, the response of the Applicator to the change in Encoder Speed
is proportional to the number of Scans. The lower scan numbers are more responsive to speed changes
while the higher number produces a smoother/quieter application with more power in the Merge
Applicator. In applications such as Forms Tables, where the conveyor performs start/stop moves, a lower
scan number is appropriate. In constant conveyor speed applications, a scan number closer to 8 may be
more suitable. In all instances, the performance of the system should be verified under a variety of
conditions.
Encoder Option –The Encoder Option Keys are for turning this Option on and off. If the Option is on, the
lamp to the left of the keys will be green. When the Encoder is on, Label Placement is in inches and not
seconds.
Pulse Length -The distance the product travels per pulse of the Encoder. The pulse length may be
calculated using the following formula:
Pulse Length = (Distance Product Moves / Rev) /
((Encoder Pulses / Rev) x 4)
EXAMPLE: An Encoder is mounted to a conveyor drive pulley and the circumference of that pulley is
18.75”. Therefore, with one revolution of the Encoder, the product on the conveyor will travel 18.75”. The
Encoder is a factory-installed encoder generating 2500 pulses per revolution.
Pulse length = 18.75” / (2500 x 4)
Pulse length = 18.75” / 10000
Pulse length = 0.001875 in/pulse