Please consider upgrading or use a different browser. FedEx service guarantees have been suspended through January 16, See FedEx service alerts for more detail. ADC regrets we cannot refund late deliveries until carrier guarantees are restored. Login Register. Your Account Account Home. Live Chat. AutomationDirect Live Chat. Products Support Compare. Other optional features include a transmitter power supply used to power a 4—20mA sensor.
This power supply is used to supply 24VDC power at a maximum of 40mA. In some applications, a dual-color display can also be a desirable feature, making it easy to identify different controller states.
Some products also have displays that can change from red to green or vice versa depending on preprogrammed conditions, such as indicating an alarm condition. In this case, no alarm might be shown by a green display, but if an alarm is present the display would turn red. Temperature controllers come in many different styles with a vast array of features and capabilities. There are also plenty of ways to categorize controllers according to their functional capabilities.
In general, temperature controllers are either single loop or multi-loop. Single loop controllers have one input and one or more outputs to control a thermal system. On the other hand, multi-loop controllers have multiple inputs and outputs, and are capable of controlling several loops in a process. More control loops permit controlling more process system functions. Reliable single loop controllers range from basic devices that require single manual setpoint changes to sophisticated profilers that can automatically execute up to eight setpoint changes over a given time period.
The simplest, most basic controller type is the analog controller. Analog controllers are low cost, simple controllers that are versatile enough for rugged, reliable process control in harsh industrial environments including those with significant electrical noise. Controller display is typically a knob dial.
Basic analog controllers are used mostly in non-critical or unsophisticated thermal systems to provide simple ON-OFF temperature control for direct or reverse acting applications. Basic controllers accept thermocouple or RTD inputs and offer optional percent power control mode for systems without temperature sensors. Their basic drawback is a lack of readable display and lack of sophistication for more challenging control tasks. These controllers provide safety limit control over process temperature.
They have no ability to control temperature on their own. Put simply, limit controllers are independent safety devices to be used alongside an existing control loop. They are capable of accepting thermocouple, RTD, or process inputs with limits set for high or low temperature just like a regular controller.
Limit control is latching and part of redundant control circuitry to positively shut a thermal system down in case of an over-limit condition. The latching limit output must be reset by an operator; it will not reset by itself once the limit condition does not exist. A typical example would be a safety shut off for a furnace.
If the furnace exceeds some set temperature, the limit device would shut the system down. This is to prevent damage to the furnace and possibly any product that may be damaged by excessive temperatures. General-purpose temperature controllers are used to control most typical processes in industry. Typically, they come in a range of DIN sizes, have multiple outputs, and programmable output functions. These controllers can also perform PID control for excellent general control situations.
They are traditionally placed in the front panel with the display for easy operator accessibility. Most modern digital temperature controllers can automatically calculate PID parameters for optimum thermal system performance using their built in auto-tuning algorithms. These controllers have a pre-tune function to initially calculate the PID parameters for a process, and a continuous tune function to constantly refine the PID parameters.
This allows for quick setup, saving time and reducing waste. A special type of general-purpose controller is the valve motor drive VMD controller. These controllers are specifically designed to control valve motors used in manufacturing applications such as gas burner control on a production line.
Special tuning algorithms give accurate control and fast output reaction without the need for slidewire feedback or excessive knowledge of three-term PID tuning algorithms. Profiling controllers, also called ramp-soak controllers, allow operators to program a number of setpoints and the time to sit at each setpoint. Programming a setpoint change is called ramp and the time to stay at each setpoint is called soak or dwell. One ramp or one soak is considered to be one segment. A profiler offers the ability to enter a number of segments to allow complex temperature profiles.
The profiles can be referred to as recipes by the operator. Most profilers allow storage of multiple recipes for later use.
Smaller profilers may allow for four recipes with sixteen segments each with more advanced profilers allowing for more recipes and segments. Typical applications for profile controllers include heat treating, annealing, environmental chambers, and complex process furnaces. Besides single-loop controllers which can control only one process loop, multi-loop controllers can control more than one loop, meaning they can accept more than one input variable.
Generally speaking, a multi-loop controller can be thought of as a device with many individual temperature controllers inside a single chassis. These are typically mounted behind the panel as opposed to in front of the panel as with general-purpose single loop controllers. Programming any one of the loops is similar to programming a panel-mounted temperature controller.
Do not connect anything to the "Not used" terminals. Make sure all wires are connected to the correct polarity of terminals. Power must be off when wiring and changing a temperature sensor. Be sure to use compensating wires that match the thermocouple types when extending or connecting the thermocouple wires. Please use wires with resistance when extending or connecting a platinum resistance sensor RTD. Please keep the wire as short as possible when wiring a platinum resistance sensor RTD to the controller and please route.
This controller is an open-type unit and must be placed in an enclosure away from high temperature, humidity, dripping water,. Please make sure power cables and signals from instruments are all installed properly before energizing the controller, otherwise. Please do not touch the terminals in the controller or try to repair the controller when power is applied to prevent an electric. Wait at least one minute after power is disconnected to allow capacitors to discharge, and please do not touch any internal circuit.
Do not use acid or alkaline liquids for cleaning. Please use a soft, dry cloth to clean the controller. When the desired Difference temperature has been reached, quickly short press the Power button to save the setting. The F3 Compressor Delay Time is a delay on the cooling side which can be set from minutes. When the Cooling relay is first de-energized, it will remain OFF for a minimum time in minutes as determined by the F3 setting.
A setting of 3 minutes is typically fine when used with a compressor. If no delay is desired such as when using to control a fan for cooling, the setting can be set to 0. The display is in minutes. When the desired delay time has been reached, quickly short press the Power button to save the setting. If the temperature accuracy is found to be incorrect or it is desired to match the reading of this unit with another measurement device, an offset of up to After allowing the temperature reading to stabilize for a couple of minutes, the reading should be 0.
When the desired offset has been reached, quickly short press the Power button to save the setting. To access the screw terminals, temporarily remove the back cover by depressing the tabs on either side of the back cover. The temperature sensor plugs into the white connector. It is keyed and will only go in one way though the orientation does not matter. The relay switch contacts are interchangeable. One side should connect to the power for the load which can either be AC or DC voltage and the other side should connect to the load itself.
The drawing here shows a typical setup where the unit is operating on VAC and also controlling heating and cooling devices that also operate on VAC.
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