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MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15
Thomson Technology
67
NOTE:
Do not exceed the current rating of the CT. Non-
linear output of the CT will result when the
secondary current exceeds 5 amps and will
similarly effect the MEC 2 displayed values.
In the programming mode, scroll to the desired generator supply current
phases with the SPAN function selected.
Connect an external AC ammeter and current clamp of adequate current
range to the MEC 2 controller terminals associated with the current
phases to be calibrated.
WARNING!!!
Never open circuit an energized CT as extreme high voltages
may result which may cause serious injury or death.
Standard safety procedures should be followed and be
performed by qualified personnel only. Failure to do so may
cause personnel injury and/or death.
Use the
INCREMENT
or
DECREMENT
pushbuttons to adjust the
correction factor number while observing the displayed current level on
the MEC 2. Adjust the correction factor number to obtain an identical
current reading as measured with the external AC ammeter.
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 if required.
Repeat the above procedures for all remaining generator current phases.
NOTE:
Once the span calibration setting has been
completed, re-confirm the zero calibration points. If
the zero calibration setpoint needs further
adjustment, the span calibration point must also be
re-calibrated.