Flowserve DFC17 - Manual (Page 15)

WCAIM2026 DataFlo Digital Electronic Controller DFC17 Installation, Operation and Maintenance Instructions 15
The table above shows a calibration step and the
procedure required to complete the step. It is
recommended to perform all the calibration steps if any
one item is changed. Any time a potentiometer is adjusted,
both the AdcL and AdcU procedures must be performed.
Press the DN key until the PrlL parameter appears. On
that display, press the SEL and UP keys simultaneously to
enter the RTD calibration menus.
On the menus, use the DN key to move from one
parameter to the next one in sequence. When calibration
is completed, press and hold the SEL key for three
seconds to return to the main Calibration Mode menu (the
PrlL parameter). Release and then press the SEL key
again for three seconds to return to the RunMode.
Note: When the RTD temperature units are changed, the
upper range limit will be changed to the default maximum
range shown below.
Default (maximum)
Temperature Units temperature range
°C -200 to +800
°F -300 to +999
Note: Maximum allowable span is 800°C, e.g., -200°C to
+600°C or 0°C to 800°C. Minimum span is 50°C. Span
must be set in 50°C increments.
The procedure for calibrating the module will involve
adjusting the span and zero potentiometers on the RTD
module. Since there can be some interaction between the
two pots, the lower and upper limits are adjusted in the
step for the upper limit. The lower limit procedure is used
only to record the lower limit voltage and no adjustments
should be made in that step.
When adjusting the potentiometers for the upper and
lower limit, the voltage range should be as great as
possible for the best resolution. However, some
guard band area should be left for the possibility of
temperatures slightly outside the specified range. For
example, if the lower limit voltage was 0.100 volts and the
upper limit voltage was 4.900 volts, that would give very
good resolution, but would not allow much room for
temperatures outside of the specified limits. A span of
0.500 and 4.500 might be better.
Flow Control Division
Worcester Actuation Systems
Step Display Procedure
Press SEL and UP to change the temperature units. When SEL and UP are pressed, the units will begin flashing.
Unit Pressing the UP or DOWN keys will change the units between degrees Fahrenheit and Celsius. When the correct
units are flashing, press SEL to lock in the selection.
Press SEL and UP to change the temperature range upper limit. When SEL and UP are pressed, the upper limit will
begin flashing. Pressing the UP or DOWN keys will change the upper limit to another value. When the correct
rn9U range value is flashing, press SEL to lock in the selection. The upper limit of the range will not be able to be
set to a value that is less than 50°C (100°F) above the lower limit (i.e., there must be at least 50°C or 100°F
between limits).
Press SEL and UP to enter the voltage display mode. Be sure a resistance type RTD simulator is attached in place
of the RTD. Simulate the upper limit temperature and adjust the span potentiometer on the module such that the
voltage is between 4.200 and 4.700 volts on the display. Change the RTD simulator to simulate the lower limit
RdcU temperature and adjust the zero potentiometer on the module such that the voltage is between 0.200 and 0.800
volts. Repeat the above process until the upper and lower voltages are within the stated limits. When completed,
be sure the simulator is simulating the upper limit temperature. Press the SEL key to lock in the upper limit voltage.
Press SEL and UP to change the temperature range lower limit. When SEL and UP are pressed, the lower limit will
rn9L begin flashing. Pressing the UP or DOWN keys will change the lower limit to another value. When the correct range
value is flashing, press SEL to lock in the selection. The lower limit of the range will not be able to be set to a value
that is greater than 50°C (100°F) below the upper limit (i.e., there must be at least 50°C or 100°F between limits).
Press SEL and UP to enter the voltage display mode. Be sure a resistance type RTD simulator is attached in place
Rdcl of the RTD. Enter the lower limit temperature (either 0°C or 32°F) in the simulator. The resulting voltage reading
will be displayed.
Do NOT adjust either the zero or span potentiometers in this step. Press the SEL key to lock in
the lower limit voltage. Note that zero adjustments are made in the procedure for the upper limit. This step is just
used to record the lower limit voltage.