Page 36 VRC2000 Installation and Operations Manual
Technical or Setup Assistance
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Remember that the VRC2000 can store up to 32 alarms in memory. The
oldest alarm in the system’s memory determines which outbound telephone
numbers will be dialed.
Enter a “0” to program the VRC2000 to dial all five numbers entered in the
outbound telephone number memory when it senses an alarm condition on a
status channel. The default setting is {Dial All}. If the programmed
outbound telephone number is disabled, the VRC2000 will automatically
reset this status channel to {Dial All} when an alarm is generated.
When you are ready to begin the final status-channel setup, use the
worksheets in Appendix H (Page 117) to plan the exact codes to be
programmed. Make copies of the worksheets as necessary. Planning will
make this process much faster and easier. Also, use the same worksheets to
keep a permanent written record of your programming for each status
channel.
Metering Channels
The VRC2000 has 16 metering channels (analog inputs). Metering channels
operate somewhat like status channels, and are programmed similarly.
However, each metering channel accepts an analog input. What the
VRC2000 says when a metering channel is queried is user-programmable.
The user also programs what calibration constants are used to derive
reported values, time delays before alarms, and up to four tolerance levels for
each metering channel; each metering channel can, in turn, generate alarms
and activate automatic commands.
Metering channels act like direct current (DC) voltmeters or ammeters.
They measure electromotive force over a 10V range, or direct current up to
10mA. This voltage scale can be programmed to read from 0–10Vdc, or
from -5–5Vdc (sometimes referred to as the A–D range), or from 0–10mA,
or from -5–5mA, all with respect to VRC2000 chassis ground.
Enter a “*” on the DTMF pad to program this metering channel to read a
range from -5–5Vdc; enter a “#” to program it to read a range from 0–
10Vdc.
Each metering channel’s default parameters make it act like a unity gain
amplifier; that is, the calibration constant for each metering channel is
defaulted to 1.000. The default settings can be used to take accurate readings
of voltage or current samples.
Metering Channel Settings
The VRC2000’s metering channels can be set up for linear, indirect or power
readings.
Linear Input. A metering channel defined as a linear input multiplies the
sample voltage by the calibration constant. The VRC2000 will say [L] to
indicate a linear configuration. Linear values are obtained by multiplying the
input voltage (or current) values by the calibration constant.
Linear value = (sample) * (calibration constant)
Indirect Input. A metering channel defined as an indirect input multiplies
the two previous consecutive metering-channel readings together. Indirect
VRC2000 Setup
Continued
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