Barry-Wehmiller Accraply 204RH, Руководство по эксплуатации и обслуживанию

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19 SECTION 1: SYSTEM OPERATION
1.3.8 Sensors
BACKLOG SENSOR
The backlog sensor is supplied by UCB. It is mounted at the infeed end of the conveyor just before the spacing
wheels. If the labeling system stops for any reason, products will begin to back up at the spacing wheels which will
be detected by the backlog sensor. The backlog sensor sends a signal to the upstream system to stop supplying
products. There will be room for 2-4 products on the labeler conveyor/transfer plate before the spacing wheels to allow
products already on the infeed printer conveyor to be run out.
ROTATE CARTON SENSOR
The Rotate Carton Sensor is a Banner photoelectric sensor with reflector. It is connected to the PLC which controls
the carton rotating cylinder. After the product is partially turned by the turn bar, it will break the sensor beam. The
cylinder will extend to it’s end positoin and then return home.
PRODUCT SENSOR
The Product Sensor is a Banner photoelectric sensor with reflector. The product sensor is connected directly to the
labeling head. When the product triggers the product sensor, it initiates the label dispense cycle. The labeler will
dispense two labels per product sensor trigger, one at the leading and one at the trailing edge of the product.
CLEARANCE SENSOR
The Clearance Sensor is a Banner photoelectric sensor with reflector. It is mounted upstream from the corner wipe-
down station. It is connected to the PLC. This sensor will ensure that a product does not run into the wipe-down
components during a wipe cycle. If a product triggers the clearance sensor while the hold down cylinder is in the
down position, a clearance pause will occur. During a clearance pause, the conveyor and spacing wheels are paused
allowing the wipe-down sequence to complete without the next product interfering if products are spaced too closely.
Once the wipe-down sequence is complete, the conveyor and spacing wheels will resume.
WIPE-DOWN SENSOR
The Wipe-Down Sensor is a Sick photoelectric sensor with reflector and complimentary outputs for fail-safe operation.
It is connected to the PLC and is mounted on an angle across the plane of the stop gate. The leading edge of a
product will block the sensor, initiating the wipe-down cycle. The trailing edge of the product will be detected after the
stop gate which will tell the stop gate to close. This sensor must see a gap between products or a “product too long”
fault will occur. This is done by counting encoder pulses after the stop gate has opened to release the product. If the
pulse count reaches it’s limit, the fault occurs.
CHECKER SENSORS
The Cognex Checker Sensors are used to verify label presence on product. They work by looking for a minimum level
of pixel count (pixel ratio) in a set window in a captured image. The checker sensors are triggered during the wipe-
down cycle, immediately after the wipe down cylinder returns to home position. The checkers are equipped with lights
that are required for capturing the image.
GENERAL INFORMATION