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9
WVRC-4 Plus Installation and Operation Manual
INSTALLATION
Metering (analog) inputs (cont).
CAUTION!
Floating Grounds
Except for the status/logic (wet) inputs, none of the WVRC-4 Plus’s metering (ana-
log) inputs will accept a floating ground. Damage to the WVRC-4 Plus or your
equipment may result from connecting a floating ground output to the WVRC-4
Plus. If you require metering equipment with inputs that have a floating ground, a
DC isolation amplifier should be used.
Four metering (analog) input channels are available with the WVRC-4 Plus via
removable euroblock screw terminals. Connect the positive side of the metering
source to the desired channel terminal labeled MTRx (where x is the channel num-
ber 1 through 4) and connect the metering source ground to the associated MGND
(metering ground) terminals.
Each metering (analog) input can handle up to (positive only) 10 volts DC and must
be ground referenced and connected to the associated MGND ground terminal.
Inputs are self-calibrating and are based on an internal A/D converter with a preci-
sion, low-drift voltage reference, so the reading should not drift over time or with
temperature. Metering setup is performed by connecting the sample voltage to the
MTRx and MGND metering (analog) input, then calibrating for the desired value
(reading) using the web interface.
NOTE:
Valid sample voltages MUST be applied to the selected metering input in
order to perform calibration.
Status/Logic Inputs
Each status/logic input is optically isolated and can be configured to accept either a
contact closure (DRY = default) or a (floating, WET) input. Attach your dry con-
tacts to the desired status/logic channels StxA and STxB (where x is the status/logic
input channels 1 thru 4) terminals.
Each input is equipped with a four-position header (please refer to the jumper layout
in the appendix). IN-1 configures status/logic input one, IN-2 status/logic input two,
IN-3, status/logic input three and IN-4, status/logic input four. Each jumper (IN-x,
where x is the status/logic input) and the header pins 1,2,3,4 are used to configure for
wet or dry operation. The factory default is jumpers between pins 1 & 2 and pins 3
& 4 for DRY operation (switches, relay contacts, and open collector outputs.) In the
DRY configuration, the “A” terminal is ground while the “B” terminal is the cathode
of the opto-isolator diode (pulled up to 5 volts through a 2.2K resistor).
To change a status/logic input to (floating) WET (user supplied voltage between 5
and 24 vdc), remove both jumpers from JPx and place ONE jumper over pins 2 &
3. Connect the positive voltage to terminal “A” (anode) and ground or minus volt-
age to terminal “B” (cathode).
NOTE: Please refer to the appendix for configu-
ration examples and observe proper polarity.
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