48VFL & 96VFL v1.2 07/13
Controller Overview
Controller Wiring
The controller must be wired before use. The controller’s input, outputs, and AC power are connected via
its rear terminals. Refer to the wiring diagram for details.
Programming Menus
The controller uses a menu-based programming format. The menu levels are USER, PID, OPTION, and
SOFT-START. Each menu includes a series of parameters that customize the controller. The menu
structure and parameter descriptions are detailed in the instructions on reverse side of this sheet.
Inputs
The controller accepts an input from a Thermocouple, RTD, or Analog signal. Wire the input as shown in
the wiring diagram. The measurement (PV for Process Variable) is displayed on the controller’s top LED
readout in red.
Setpoint Value (SV)
The Setpoint Value (SV) is the process application target value. For example, in an oven application the
desired oven temperature is the SV. This SV is changed adjusted as described in the operating
instructions. The SV is shown on the controller’s lower LED display digits in green.
Control Outputs
The control outputs (C1 & C2) are to be wired to an external control device such as a heater, valve,
switch, etc. The controller automatically adjusts external devices to bring the Process Variable (PV) in
line with the Setpoint Variable (SV). Available outputs are Relay, Pulsed DC, and 4-20mA Analog Output.
Tuning
The controller must be tuned for every new application. It is strongly recommended that user run the
Auto Tune function (AT). Note that the controller must be wired and ready to go before Auto Tune is
started. Auto Tune optimizes the controller’s response to exactly match the characteristics and dynamics
of the process at hand. Although auto tuning will be sufficient in most cases, there may be times when
manual adjustments are required. Qualified personnel can Manually Tune the controller using the PID
parameters in the PID Menu Level. Note that improper tuning can cause sever process disturbances;
Use Auto Tuning when possible. Again, use Auto Tune whenever possible.
Alarm Outputs
The controller has alarm output relays (A1 & A2) that can be used to switch on/off a lamp, sound a
buzzer, shut down a heater, etc. at a programmed alarm setpoint. Refer to the discussion of Alarms on
the main instruction page.
System Reset
To revert all of the parameters to their original factory default settings, press and hold the UP and DOWN
arrow keys simultaneously while turning the controller ON. Release the keys after the display switches
on.
Security LOCK
To lock the controller, in order to avoid setpoint and program tampering, refer to the information provided
in this manual for the ‘LOCK’ parameter.
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