The PR446 Belt Feeder Controller is used within weigh belt feeder systems in order to accurately control the rate of delivery of bulk solid materials along a conveyor belt. It can be used to control the belt speed on weigh feeders where the belt loading is constant or pre-feeding devices onto a fixed speed belt. Multiple weigh feeder systems, incorporating multiple PR446 Belt Feeder Controllers, can be used for ratio blending and additive control applications.
The PR446 Belt Feeder Controller receives signals from the weigh feeder belt scale and speed sensor. Using a combination of high resolution electronics coupled with intelligent signal filtering techniques the PR446 Belt Feeder Controller is able to act as a high accuracy integrator when processing these incoming signals to continually calculate the rate of feed of material over the belt scale and the total quantity of material transferred.
From this calculated feed rate reading the PR446 Belt Feeder Controller uses a sophisticated control algorithm to make adjustments to the 4-20mA analogue output control signal used to control the belt speed, or pre-feeding device, in order to maintain a pre-set target feed rate. User configurable control parameters allow the PR446 Belt Feeder Controller to be tuned to the weigh feeder and material flow characteristics.
The display may be selected to Actual Feed Rate, Target Feed Rate and Total at any time via the tactile front panel keys. Access may be gained to the control and calibration data which is pass-number protected.
An additional 4-20mA output provides an actual feed rate signal, to PLC/computer or remote display.
The blending of materials using multiple weigh feeders can be achieved in a variety of different ways using the flexibility of the PR446 Belt Feeder Controller.
If you are using a host PLC or PC system that acts as the central point for the transmission of the desired target feed rate for each individual weigh feeder then you have the option of interfacing to each PR446 Belt Feeder Controller either by 4-20mA analogue signals or serial communications using the supported SABus (simple ASCII commands) or Modbus RTU/ASCII in order to both set the target feed rate within each individual PR446 Belt Feeder Controller and receive the live feed rate data back from each controller.
Alternatively, multiple PR446 Belt Feeder Controllers can be linked together using 4-20mA analogue signals with one controller acting as the master device and the remaining controllers as slaves. To further enhance the flexibility of this arrangement the blend ratio of each additive material to the main material can be set individually within each slave device.
The PR446 Belt Feeder Controller may be used to control the feeding of a pre-set quantity of material, with or without rate control, for batching and loading system. A digital output operates as the belt run control function and together with start/stop digital inputs provides the means of running the belt until the desired target quantity of material has been conveyed. The pre-set material target total may be entered via the keypad or downloaded serially using one of the communication protocols supported.
PR446 - Belt Feeder Controller Data Sheet
The PR426 Belt Weigher Transmitter connects with up to four strain gauge load cells fitted to a belt weigher mechanism from which it generates a calibrated weight signal. It also connects with a proximity switch or shaft encoder, from which it receives pulses in proportion to belt movement.From these two inputs and from calibration and […]
The PR448 Feed Rate Controller operates in conjunction with continuous loss-in-weight feeders in order to accurately control the rate of delivery of product from a weigh hopper. The loss-in-weight feeder weigh hopper is mounted on load cells and is fitted with a variable feeding device such as a variable speed screw or vibratory feeder. Accurate […]
The PR436 Belt Weigher Indicator connects to a belt weigher mechanism in order to continually calculate the rate of flow of material over the belt scale and the total quantity of material transferred. A wide variety of belt scale designs containing up to four load cells are supported, along with a range of speed sensor […]