The PR444S Weigh Controller is capable of automatically controlling a wide variety of batch weighing applications such as Bag and Container Filling, Bulk Container and Weigh Hopper Discharging and Material Intake and Outloading systems.
The PR444S Weigh Controller has a built-in load cell amplifier front end allowing it to be connected directly to up to four strain gauge load cells fitted to the weighing system. From this signal and from stored control and calibration data it accurately controls the repetitive weighing-in or weighing-out of target quantities of material. Access to the control and calibration data is pass-number protected.
The batch weighing control can be started, stopped and when necessary reset, by using the three digital inputs provided, either under automatic control from other equipment e.g. a central PLC system, or from external pushbuttons.
PR444S Weigh Controller Operation
The PR444S Weigh Controller can be configured to operate in one of three possible modes: ‘Weighing-In’ (Gain-In-Weight), ‘Weighing-Out’ (Loss-In-Weight), and Throughput (continuous filling and discharging). Each mode of operation has a set of associated control parameters which allow the PR444S Weigh Controller to be perfectly tuned to the weighing system.
The ‘Weighing-In’ mode of operation is used for fully automatic gain-in weight control of a single ingredient e.g. container filling applications. The PR444S Weigh Controller supports two speed feeding control, automatic inflight compensation and jogging control in order to minimise weigh cycle time whilst maintaining the maximum possible levels of batch weighing accuracy.
The PR444S Weigh Controller also offers discharge control for applications where the material is weighed in to a weigh hopper and then subsequently discharged, either in to a container or the next stage of the process.
The PR444S Weigh Controller is also capable of storing up to ten batch targets with associated weigh control configuration parameters allowing for the rapid switching of products whilst maintaining the optimum control characteristics and therefore weighing accuracy.
The ‘Weighing-Out’ mode of operation is used for fully automatic loss-in-weight control of material held within a weigh hopper or bulk container. The PR444S Weigh Controller supports two speed feeding control, automatic inflight compensation and jogging control in order to minimise weigh cycle time whilst maintaining the maximum possible levels of batch weighing accuracy.
The PR444S Weigh Controller is also able to control the automatic top-up of the weigh hopper. The top-up control is interleaved with weighing control so that a weigh cycle will be inhibited until there is sufficient material in the hopper to satisfy the batch target.
The ‘Throughput’ mode of operation is used for fully automatic continuous hopper filling and discharging control for use in material intake/outloading systems or inline material totalising.
The automatic weighing and discharging control is similar to the Weighing-In mode of operation except that a final discharge cycle is started, if not already discharging, when the run digital input signal is removed. This caters for registering the last part of a run of material where otherwise the weigh hopper would remain partly full. Also, the Actual Weight, Batch Number, Throughput rate and material Total values are not updated until the discharge is complete. This ensures that the Actual Weight is taken as the gross weight before discharge minus the gross weight after discharge; thereby registering the amount actually discharged through the weigher should small amounts adhere to the weigher.
In addition to the standard process data available the Through-put rate (Tonnes/Hour) is available for display and access via the serial link.
Configurable Process Alarm Indication
The PR444S Weigh Controller offers configurable settings for the key process alarm conditions that must either alert the attention of an operator or be transmitted to a host system, such as: out of tolerance weighments or insufficient material. These alarm conditions are indicated on the local display, switching an associated digital output and via serial communications.
Industry Standard 0-10V or 0/4-20mA Analogue Output Option
The PR444S Weigh Controller has an additional 0-10V or 0/4-20mA analogue output which can be configured to provide transmission of gross weight, net weight, or throughput rate. Alternatively, it can be configured to provide two speed feeding control with independently adjustable fast and slow feed signal levels configured to suit the application.
Batch Report and Label Printing
The PR444S Weigh Controller comes complete with a software configurable RS232 serial interface that may be linked to an appropriate printer in order to produce batch reports. It supports various formats of time and date stamped batch reports with options for producing detailed or summary reports. Label printing is also supported in conjunction with popular label printers, ideal for identification of filled containers with self-adhesive labels.
Network Communication with Host Systems
The software configurable RS232/RS485 serial interface can be used for communication with host PLC or PC systems. The appropriate process data is available to be read, and written where applicable, using the SABus (simple ASCII commands) protocol.
Dual Trip Relay Outputs
Completely independent of the automatic weigh control two trip relay digital outputs are provided with separate level, deadband and high/low sense settings.
PR444S Weigh Controller Features
- Ideal for Bag and Container Filling, Bulk Container and Weigh Hopper Discharging and Material Intake and Outloading systems
- Built-in high accuracy load cell amplifier allowing direct connection to the weighing system
- Weighing-in, Weighing-out, and Throughput operating modes
- Two speed feeding control, automatic inflight compensation and jogging control
- Automatic weigh hopper top-up control when operating in weighing-out mode
- Process alarm indication with associated digital output
- Capable of storing up to ten batch targets for rapid switching of products
- Time and date stamped batch report and label printing
- Serial network communications to a host PLC or PC system
- Industry standard 0-10V or 0/4-20mA analogue output option
PR444S Weigh Controller Specification
|PR444S Data Sheet||PR444S – Weigh Controller|