WIRING CONNECTIONS
The Model 2100 electronics enclosure is provided with
four holes for 1/2 inch NPT conduit fittings. These holes
are on the bottom of the back housing of the enclosure
and allow entry for the 115 (230) VAC power wires,
sensor cable, 4-20 mADC signal output wires and the
relay output wires.
Do not run the power wiring, sensor
cable or signal output wires in the same conduit as this
will affect the meter's operation.
The terminals on the power supply board will accept 14
to 22 gauge wire. A small flat blade screw driver will be
required to loosen and tighten the screws. Figure 2-5
identifies the terminals for proper wiring.
Power connections.
TB1 is the terminal block for the
115 (230) VAC connections. Terminal 1 is the high side
(black wire) connection. Terminal 2 is the low, or neutral,
side (white wire) connection. Terminal 3 is the earth
ground (green wire) connection.
TB2 Terminals 1 and 2 are the connections for the DC
power input if the meter is to be operated on battery
power Terminal 1 is the positive (+) connection and
Terminal 2 is the negative (-) connection. The DC input
voltage must be between 12 and 14 volts..
When operating the meter on DC power, an additional
DC power source may be required to power the 4-20
mADC output. Refer to the 4-20 mA signal output in the
following section for instructions.
Signal output connections.
TB2 is the terminal block
for the 4-20 mADC output signal and the four relay
outputs.
4-20 mA OUTPUT -
Terminals 3 and 6 are the con-
nections for the 4-20 mA output when the meter is
operated on AC power. Terminal 6 is the positive (+)
connection and Terminal 3 is the negative (-) connection.
A jumper wire is connected between Terminals 4 and
5 when shipped from the factory. This jumper must be
in place when operating the meter on AC power.
If the meter is operated on DC (battery) power and a 4-
20 mA output is required, an additional DC power source
may be required. To properly connect the power source
for the 4-20 mA output refer to Figure 2-5. Disconnect
the jumper wire between Terminals 4 and 5. Connect the
positive wire of the battery to Terminal 5, the negative
wire of the battery to the negative input of the load
(recorder) and connect the positive input of the load to
Terminal 6. The DC voltage required to power the 4-20
mA loop is 8 volts. The size of the DC voltage source
BACK HOUSING
POWER SUPPLY BOARD
POWER
OUTPUTS
4-20
MADC
TEST POINTS
SENSOR
FIGURE 2-4
BACK HOUSING
2-2