Specifications

e-mail: [e-mail] voice: 360.854.9559 fax: [phone]
8
Site Sentinel
®
16 Installation and Operation Manual
INSTALLATION
Metering (analog) inputs (cont).
CAUTION! Floating Grounds
Except for the status/logic (wet) inputs, none of the Site Sentinel® 16’s metering
(analog) inputs will accept a floating ground. Damage to the Site Sentinel® 16 or
your equipment may result from connecting a floating ground output to the Site
Sentinel® 16. If you require metering equipment with inputs that have a floating
ground, an DC isolation amplifier should be used.
Sixteen metering (analog) input channels are available with the Site Sentinel® 16
via removable euroblock screw terminals. Connect the positive side of the source to
the desired channel terminal labeled MTRxx (where xx is the channel number 01
through 16) and 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
MTRxx and MGND metering (analog) input, then calibrated for the desired value
(reading).
NOTE: Valid sample voltages MUST be applied to the selected metering input
in order to perform calibration.
Status/Logic Inputs
Each optically isolated status/logic inputs can be configured to accept either a con-
tact closure (DRY = default) or a (floating, WET) input. Attach your dry contacts to
the desired status/logic channels StxxA and STxxB (where xx is the status/logic
input channels 01 thru 16) terminals.
Each input is equipped with a four-position header (please refer to the jumper lay-
out in the appendix). JP1 supports status/logic input one, JP2 status/logic input two,
JP3, status/logic input three and JP16, status/logic input sixteen. Each jumper (JPxx,
where xx 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 DRY. (Switch, relay contact, open
collector) 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-isolator
diode (pulled up to 5 volts through a 2.2K resistor).
To change the status/logic input to (floating) WET (user supplied voltage between 5
and 24 vdc), 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 termi-
nal “B” (cathode). NOTE: Please refer to the appendix for configuration exam-
ples and observe proper polarity.