| Synchronized pre-heating
Eliminates differential heating during startup due to different heat rates of individual heaters in applications such as extruders and injection hot runner control. The setpoint ramp rates of all heating zones within a group are synchronized by “holding back" the ramping setpoint. In order to achieve this, the individual loop bａnd alarms are controlled by the common alarm output and isolated logic input functions PC interface port + OPC based configuration software
The integrated configuration port uses special software and an adaptor allowing: - Easy configuration of the instrument, with descriptions of the parameters and the relative limits.
- Computer storage of the complete configuration allowing it to be copied to other RFS units.
- Copying and cloning of the configuration to a new instrument.
- The configuration interface port can be used for configuration and for monitoring the process during setup.
Smart tuning
Automatically adjusts the PID parameters according to the process dynamics. An important characteristic of the Eurotherm Controls continuous self tuning algorithm is its ability to optimize control parameters without injecting any artificial disturbances into the system. Sequential addresses (Modbus) for commonly accessed parameters
To maximize the data transfer rates between the RFS and the host supervisory system, important operating parameters are grouped. Digital status information is transferred as data words to increase efficiency. The RFS is able to communicate relevant parameter information with a single data request, instead of a series of separate address operations. | | Process protection alarms
Process (high or low limit), Bａnd and Deviation alarm outputs are available with the additional flexibility of latching and masking functions until the process variable reaches the alarm threshold. Bａnd and Deviation alarms are also masked after a setpoint change until the process variable reaches the alarm threshold. The alarm latching function holds the alarm on until it is acknowledged. Startup energy management
To reduce the maximum electrical loading at machine startup, the sequence of the RFS control outputs is scheduled according to the selected instrument Modbus address. This significantly reduces maximum startup current requirements and offers potential savings in electrical installation capacity and cabling specification requirements. Communication availability of I/O
All RFS I/O can be read directly over the Modbus communication interface by the host supervisory system. Additionally, the communication host can write to RFS outputs that are not assigned as alarm or status functions. This expands available PLC and host supervisory system I/O, simplifies machine troubleshooting and provides the ability to perform remote diagnostics. OFD - output failure detection (optional)
Using the CT input, the output failure detection function monitors the current in the load driven by output 1. Load and actuator protection is provided in the following manner:
During the ON period of the output, the instrument measures the current through the load and generates an alarm condition if the current is lower than a pre-programmed threshold. A low current indicates a partial or total breakdown of the load or actuator SSR.
During the OFF period of the output, the instrument measures the leakage current through the load and generates an alarm condition if the current is higher than a pre-programmed threshold value. A high leakage current indicates a short circuit of the actuator. |
