procedures should only be performed by qualified electrical technicians
who are familiar with Gaston County equipment and controllers.
Adjusting temperature circuits on operating equipment can be
hazardous. Never adjust backup safety temperature switches beyond
safe operating temperatures of the machine as shown on the ASME
nameplate of the vessel.
MP6000 and MM3000
Supply valves to the
machine should be shut, locked-out, and tagged per OSHA regulations.
Main pump starter disconnect should be turned off.
1. RUN RTD
power from controller. Disconnect wire from "-" terminal
on RUN RTD transmitter. Attach "+" lead from
multimeter. Attach "-" lead from multimeter to wire
removed from "-" terminal on transmitter. Set multimeter
to measure DC current in milliamps. This will show the output from
the transmitter to the controller.
wires from the RUN RTD. Attach an RTD calibrator to the wires from
the controller. Leave the wires from the RUN RTD unattached.
Re-apply power to the controller.
1.3. Set the
calibrator to 0 degrees Fahrenheit. Observe the milliamp reading on
multimeter. Adjust ZERO trimpot on RTD transmitter to achieve 4
milliamp output as observed on multimeter. Indicated temperature
on controller screen should be 0 degrees.
1.4. Set RTD
calibrator for 300 degrees. View indicated temperature on
controller screen (or supervisor screen on MM3000 controllers)
Adjust SPAN trimpot on RTD transmitter to achieve a 300 degree indicated
temperature. Observe the milliamp reading on multimeter. The
expected output from the transmitter is 20 milliamps (+/- .2 ma).
steps 1.3 - 1.4 until no further adjustments are necessary.
power from the controller. Remove multimeter. Reattach wire
to "-" terminal on transmitter. Remove RTD calibrator
and reattach RTD.
can be checked with a multimeter set to ohms