Introduction - Extech Instruments 48VTR User Manual

Introduction

Thank you for selecting the Extech 48VTR Process Controller. The 48VTR uses intelligent
algorithms (including fuzzy logic) to offer highly precise process control. The wide array of
features and functions are easily configured in the four program menu levels.
Controller Wiring
The controller must be wired before use. Inputs, outputs, and AC power are connected on the
rear terminals as described in the Wiring section.
Process Inputs
The 48VTR can be ordered in a variety of input configurations. For temperature versions, the
controller accepts a thermocouple or RTD thermometer. For analog versions, the controller
accepts a 4 to 20mA process signal.
PV (Process Variable) Display
Process inputs values are displayed on the PV (Process Variable) digits on the front panel.
Control Outputs
The 48VTR offers three control output options: Mechanical relay, Pulsed DC Trigger (29VDC),
and Analog (4-20mA). Relay and Trigger outputs are ON-OFF control types (pulsed). The 4-20
output, on the other hand, is a linear signal corresponding to 0 to 100% output power.
Alarm Output
The Alarm relay can be used to perform a variety of alarm and timer functions. Alarms can be
used to shut down power in the event of an emergency, switch on an alert signal, control other
variables in a process, and more.
Setting Value (SV)
The Setting Value (SV), also known as the Setpoint, is the target point for your process. The SV
is changed using the arrow keys. The SV is displayed on the lower LED digits in green.
Programming Menus
The controller has four Programming Menu Levels. Each menu includes a series of
customizable control and tuning parameters.
Tuning the Controller
The controller's PID settings must be tuned for each application. Run the Auto Tune utility
after the controller is wired and ready for use. Manual tuning adjustments can also be made.
Tuning is key to a stable process.
Contact Extech
Visit the Extech website www.extech.com for customer support, up-to-date user
documentation, and full warranty information. This device is covered by a 2-year limited
warranty.
48VTR User Manual v6.0 10/1/20
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