MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM047 Rev 13 05/03/30
74
Thomson Technology
With the correct current displayed, press the ENTER push-button to
accept the correction factor number. Record the correction factor number
on the MEC 20 programming sheet for future reference.
Repeat the above procedure for all remaining generator current phases.
10.6.5.2.
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.
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 20 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 20 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 push-buttons to adjust the
correction factor number while observing the displayed current level on
the MEC 20. Adjust the correction factor number to obtain an identical
current reading as measured with the external AC ammeter.
Summary of Contents for MEC 20
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