MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM047 Rev 13 05/03/30
73
Thomson Technology
10.6.4. CURRENT SENSING CALIBRATION
CURRENT A ZERO
99
350A
Displays the generator’s load current (phase A, B or C) to be calibrated.
Displays the type of calibration function, either ZERO or SPAN.
Displays the calibration correction factor number (0-255) used to obtain the
correct current reading.
Note:
To correctly calibrate any of the current
sensors, the ZERO function must be calibrated before the SPAN function.
Displays the actual current measurement that will be the same value as shown
on the MEC 20 display menus for generator supply. This current reading may
be calibrated higher or lower by changing the correction factor number.
10.6.5. CURRENT CALIBRATION PROCEDURE
NOTE:
To accurately calibrate the MEC 20’s
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:
10.6.5.1.
ZERO CALIBRATION
Connect an external AC ammeter with current clamp of adequate current
range to the MEC 20 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 push-buttons to adjust the
correction factor number while observing the displayed current level.
Adjust the correction factor number just until “0” amps is obtained.
Summary of Contents for MEC 20
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