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10
WVRC-8 Installation and Operation Manual
INSTALLATION
Connecting your WVRC-8 to other equipment
Analog (metering) inputs
CAUTION!
Analog input (metering) samples may be elevated several hundred
volts above ground on some external equipment. Permanent damage may occur to
the WVRC-8 and/or external equipment if a high voltage metering source is con-
nected to the WVRC-8! Failure to observe this warning may also cause injury to the
installer or other personnel.
CAUTION! DO NOT CONNECT SAMPLE VOLTAGES IN EXCESS OF 10
VDC OR DAMAGE MAY OCCUR TO YOUR WVRC-8.
CAUTION! Floating Grounds
Except for all status (wet) inputs, none of the WVRC-8’s metering inputs will accept
a floating ground. Damage to the WVRC-8 or your equipment may result from con-
necting a floating ground output to the WVRC-8. If you require metering inputs
with equipment that has a floating ground, an isolation amplifier must be used.
Eight analog (metering) channels are connected to the WVRC-8 via depluggable
euro-block screw terminals. Connect the positive side of the source to the desired
channel terminal labeled ANx (where x is the channel number 1 through 8) and asso-
ciated GND (ground) terminal. Each analog (metering) input can handle up to (pos-
itive only) 10 volts DC and must be ground referenced. Connect your metering
ground to the associated ground terminal. Inputs are self-calibrating and are based
on an internal A/D converter with a precision, 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 analog (metering) input, then programming
the WVRC-8 for the desired value (reading).
Status Inputs
Each optically isolated status inputs can be configured to accept either a contact clo-
sure (dry = default) or a (floating, wet). Attach your dry contacts to the desired sta-
tus channels StxA and STxB (where x is the status input) terminals.
Each input is equipped with a four-position header. JP4 supports the first four sta-
tus inputs, while JP5 supports input five through eight. Each input is labeled IN-x
(where x is the status input) and the header pins are labeled 1,2,3,4. The factory
default is a DRY input (switch, relay contact) with jumpers between 1 & 2 and 3 &
4. In the dry configuration, the “A” terminal is ground while the “B” terminal is the
cathode of the opto diode (pulled up to 5 volts through a 2.2K resistor).
To change the status input to (floating) WET (user supplied voltage between 5 and
24vdc), remove both jumpers and place ONE jumper over pins 2 & 3. Connect the
positive voltage to terminal “A” (anode) and ground or minus voltage to terminal
“B”(cathode). ! NOTE: Please observe proper polarity.
