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Digital Electronic Controller DFC17 Installation, Operation and Maintenance Instructions WCAIM2026

4.2.5 Key Sequences for Calibrating Counter-clockwise Position

Press DN to select the counter-clockwise setpoint

parameter PoCC

Press SEL + UP to begin calibrating the parameter.

1) Use either the UP or DN switches to manually rotate

the actuator to its full counter-clockwise (CCW)

position.

2) With the actuator in the full CCW position, the voltage

reading on the display should be greater than 3.000

volts. If not, recheck PoC. If it is correct and the PoCC

reading is still not correct, contact factory.

Press SEL to accept the value shown and return to

the calibration menu.

4.2.6 Key Sequences for Calibrating Analog Process #1 Lower

Input Signal

This procedure is followed only if an analog process

module is used.

Press DN to select the lower input parameter PrlL

Press SEL + UP to begin calibrating the parameter.

Attach an accurate current source to the process input

and set a current of 4.0 mA. The voltage reading on the

display should be less than 1 volt.

Press SEL to accept the value shown and return to the

calibration menu.

4.2.7 Key Sequences for Calibrating Analog Process #1 Upper

Input Signal

This procedure is followed only if an analog process

module is used.

Press DN to select the upper input parameter PrlU

Press SEL + UP to begin calibrating the parameter.

Attach an accurate current source to the process input

and set a current of 20 mA. The voltage reading on the

display should be greater than 3.000 volts

Press SEL to accept the value shown and return to the

calibration menu.

4.2.8 Key Sequences for Calibrating Single Channel RTD Process

Module

This procedure is followed only if a single channel RTD

process module is used. With this type of process

module, an attached 100 ohm platinum RTD develops a

voltage representing the temperature of the process.

RTDs can cover a very wide temperature range. The RTD

module however allows a narrower temperature range to

be used. This is useful for applications that need higher

resolution and do not need a wide range.

The purpose of this procedure is to specify the

temperature units, temperature range, and to record the

actual voltage values at the lower and upper process

limits. This procedure involves adjusting components on

the RTD module. This procedure is entered by selecting

either the Pr1L or Pr1U parameter for calibration. When

either of those parameters is selected for calibration, the

controller starts the following calibration sequence. At any

time in the menu, the user can press the SEL key to

return to the calibration menu.

Any one step in the calibration procedure can be

performed without performing the others. However, it is

recommended to perform all the calibration steps if any

one item is changed.

Calibrating the RTD module circuitry involves adjusting

the span and zero potentiometers on the module to

achieve a good voltage swing for the temperature range

selected. When adjustments have been properly

completed, the calibration routine will use the calibrated

analog voltages to create a linearization table.

Flow Control Division

Worcester Actuation Systems

Table 4.2.1 Calibration Mode Menu

Display Description Acceptable Range

SEtL Setpoint lower limit signal value. Less than 1 volt.

SEtU Setpoint upper limit signal value. Between 3.800 volts

and 5.000 volts.

PoC Shaft position feedback value at full clockwise position. Between .200 volts and .400 volts.

PoCC Shaft position feedback value at full counter-clockwise position. Greater than 3.0 volts.

PrlL Process #1 signal lower limit value. Unique to process.

PrlU Process #1 signal upper limit value. Unique to process.

Pr2L Process #2 signal lower limit value. Unique to process.

Pr2U Process #2 signal upper limit value. Unique to process.

CYt Cycle time measurement. Dependent on actuator.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 27 28

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