MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
66
Displays the actual current measurement that will be the same value as
shown on the MEC 2 display menus for generator supply. This current
reading may be calibrated higher or lower by changing the correction
factor number.
9.6.5. CURRENT CALIBRATION PROCEDURE
NOTE:
To accurately calibrate the MEC 2 current sensors,
an external test AC ammeter and current clamp is
required, with an accuracy of 0.5% or better.
Note: Zero calibration must be completed before span calibration.
To calibrate the generator supply current sensors, perform the following
procedure:
9.6.5.1.ZERO CALIBRATION
Connect an external AC ammeter with current clamp of adequate current
range to the MEC 2 controller terminals associated with the current
phases to be calibrated. With the generator stopped, confirm there is “0”
current on the phases to be calibrated. In the programming mode, scroll
to each of the desired generator supply current phases with the ZERO
function selected.
Use the INCREMENT or DECREMENT pushbuttons to adjust the
correction factor number while observing the displayed current level.
Adjust the correction factor number just until “0” amps on the display is
obtained.
With the correct current displayed, press the ENTER pushbutton to
accept the correction factor number. Record the correction factor number
on the MEC 2 programming sheet for future reference.
Repeat the above procedure for all remaining generator current phases.
9.6.5.2.SPAN CALIBRATION
Apply 50%-100% load to the generator set. Note: It is recommended to
load the generator set to 100% rated load for calibration purposes to
obtain good accuracy throughout the full span of operation.
To Next Page
Loading...
