Page 38 VRC2000 Installation and Operations Manual
Technical or Setup Assistance
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Calibration Constant and Tolerance Limits
Any mathematical value between -9,999 and 9,999 can be programmed into
any metering channel as the calibration constant. This value must contain
four digits, plus the decimal point.
SPOKEN NUMBER NOTE:
The VRC2000 can only say numbers ranging from -9,999 to 9,999. Use unit
identifiers and calibration constants to convert the voltage or current readings
on any metering channel into this range.
Use the calibration constant to obtain actual voltage or current readings
based on a sample.
Example
If the voltage sample is 5V, which represents an actual value of 5,000V,
program a calibration constant of 1,000. Or program a calibration constant
of 1, and change the units identifier to KILO VOLTS. Since the largest
number that the VRC2000 can say is 9,999, use the best combination of the
calibration constant and the units identifier; this will result in information
being reported clearly. Use “*” as the decimal point in positive numbers.
Use “#” for the decimal point in negative numbers.
POSITIVE/NEGATIVE CONSTANT NOTE:
The VRC2000 obeys mathematical rules. A negative sample multiplied by a
negative calibration constant results in a positive value. A positive sample
multiplied by a negative calibration constant results in a negative value.
Tolerance Limits
Up to four tolerance limits for each metering channel can be programmed.
Two of these limits must always be below the nominal value set for each
metering channel; the other two must be above the nominal value. The
second low limit refers to the lowest tolerance limit the metering channel
will monitor; the second upper limit refers to the highest tolerance limit.
These tolerance limits can be programmed to automatically activate selected
command channels, or to automatically call the outbound telephone numbers
selected under the previous parameter, or both.
All tolerance limits must be set according to the result of the voltage or
current sample for each metering channel and the associated calibration
constant.
Just as with the calibration constant, program any number between -9,999
and 9,999 into any metering channel as a tolerance limit. Obviously, setting
the second low tolerance limit for a metering channel at 9,999 will cause the
VRC2000 to always generate an alarm if the alarm function for this
tolerance limit is enabled. To disable the second low tolerance limit, set it at
the lowest extreme number available (-9,999). On the other hand, if the first
high tolerance limit for a metering channel is set at -9999, the VRC2000
will always generate an alarm if the alarm function for this tolerance limit is
enabled. To disable the first high tolerance limit, set it at the highest number
available (9,999).
Remember to use “*” as the decimal point in positive numbers (i.e.
“5*125”=5.125), “#” for negative numbers (i.e. “7#85”=-7.85”). This value
must contain four digits, plus the decimal point.
VRC2000 Setup
Continued
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