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Rail mount process controller

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article image The LFS -- DIN rail or wall mounted.

ERO Australia has introduced the new economical LFS 1/16 DIN standard process and temperature controller.

The compact DIN rail or wall mounting model LFS [1/16 DIN (48 x 48mm)] uses advanced PID algorithms to provide stable 'straight line' temperature control.

Self-tuning is included to optimise the control performance without the need for specialist knowledge or training. The PID control mode can also be switched off for ON/OFF control, or to change the module to an indicating alarm.

To eliminate the need for a zone switch, a "turn off" function is provided to switch off the output control and alarm function. In this mode the module acts as an indicator monitoring the process.

A bumpless transfer from off to control is initiated on reactivation of the control function. This feature allows for energy saving in batch processing as well as a simple safety monitor for operators.

A universal input allows for inputs such as thermocouple (J, K, T, L, N, R and S) plus Pt100, dc voltage (5V and 10V) and mV process inputs, which allows for inputs such as 4-20mA via terminal shunts.

This allows the one instrument to be used for all standard temperature and process inputs. Universal power supply options of 100 to 240V ac allow the LFS to be used with mains power supplies worldwide.

One or two outputs are available for heating, cooling or alarm functions, which are set via front accessible tactile buttons ensuring positive operation.

The LFS outputs can be setup for either control or alarming. Used as alarms, the outputs can be configured to activate as high, low band or deviation alarms, with adjustable deadband.

The alarms can also be configured to activate only after the process has reached its operating condition, to eliminate start-up trips. Outputs can be either voltage free relays or logic outputs for driving power switching modules such as solid state relays.

The LFS is provided with an analogue output option, programmable as a control output for heating, for driving valves, or power switching modules to control transformer and inductive loads, or the output can be programmed to retransmit the input value.

In addition to this analogue output, the LFS can also be fitted with an optional RS485 ModBus serial communication card, allowing for LFS to be monitored and controlled by higher level systems such as PLCs and SCADA packages.

The LFS is supplied as standard with a digital input for selecting between the main and auxiliary setpoint.

An optional feature is the addition of an external current transformer to enable the Output Failure Detection alarm. The CT enables the LFS to monitor the load being controlled and alarm in case of load failure or overload.

The alarm output can then be used to shut down the process before any damage can occur, thus providing total protection for single phase loads.

In normal operating mode, this feature also eliminates the need for an extra current meter, as the current can be monitored on the LFS, which if fitted with the RS485 serial comms, this measurement can also be monitored by higher level systems over the RS485 network.

An IP65 rated sealing allows the LFS to be installed into harsh industrial environments. The 4 digit display and 4 function button user interface combined with simple setup procedures allows for fast commissioning, with auto-tune provided as standard for loop optimization.

The simple menu for the LFS provides a convenient and exact method for setting parameters such as new input calibrations, without the need for simulators and sources.

The cost-effective, simple-to-use LFS controller provides an ideal process control solutions for applications such as simple heating and cooling, small ovens, chillers, sterilisers, trace heating, heat sealing and injection moulding.

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