Connecting The Equipment - GPI GM Serie Guía De Operación

• subject to > 5g shock loading.
• facing the sun directly for long periods of time.
• close to high voltage/current runs, DC motors, inter-
nal combustion engines or frequency inverters.
Cable Guidelines
4-20 mA Current Loop:
• The current loop itself is very resistant to electrical
noise pickup and shielded cable is seldom needed
except in very "noisy" (electrical) locations and/or
when very long runs (thousands of feet) are used.
Sensor Cabling:
• Some products come with 20 ft. of shielded cable.
• If you require a longer cable, a 100 ft. cable kit is
available from GPI, or use Belden 9363 cable. When
wiring longer lengths of cable, be sure to connect
the shield to LOCAL-COM ONLY! (Multiple shield
connections may cause ground-loop problems).
• Some trial and error may be needed because of the
wide variety of user conditions. Try to keep cable
lengths short!
WIRING
This manual refers to various models of GPI flowmeters.
Determine what type of input the electronics will receive
and what type of output, if any, you require. Use the
diagrams found in the wiring diagrams section (if the
unit is not already wired) to correctly wire the system.
The display is externally powered by the loop.
NOTE: Totals will be lost with loss of power on loop.
CAUTION
Determine maximum power supply voltage after
determining maximum allowable voltage of all
electronic devices in the system.
The 4-20 mA Out with Display may come with 20 ft. of
cable to connect to the meter. The customer must supply
the communication loop cable. Although the unit is usu-
ally powered through the communication loop, there are
some circumstances that might require external power.

Connecting the Equipment:

• Remove the faceplate by removing the four corner
screws.
• Attach wiring from your equipment according to the
following terminal connections and wiring diagrams,
depending on your circumstances.
Terminal Connections
Remote Transmitter INPUTS / OUTPUTS
ISO-IN COM: Return for
isolated inputs
ISO-LF IN: Optically-Isolated
High-level Low-frequency
Input
ISO-HF IN: Optically-Isolated
High-level High-frequency
Input
HL-LF IN: High-level Low-
frequency Input. 150 Hz
maximum
COIL-A IN: Low-level Sin-
ewave Input
COIL-B IN: Low-level Sin-
ewave Input
HL-HF IN: High-level High-
frequency Input
EDM PWR: Local Vcc. Regu-
lated 5-VDC internal power.
This terminal can supply up
to approximately 2.5 mA,
continuously, to external
circuitry. Typical load/line regulation under ordinary conditions is about ± 10%
LOCAL COM: Local Common
0-5 V OUT: 0 to 5 V Voltage Output. Frequency to Analog Output.
PULSE OUT: Pulse-Out Frequency Output Signal. It is an "open-collector" output
(also known as "n-p-n" or "current-sinking"), referenced to transmitter Local-
Common
LOOP (–): 4 to 20 mA Current Loop – current into transmitter
LOOP (+): 4 to 20 mA Current Loop – current out of transmitter
ISO-IN COM
ISO-LF IN
ISO-HF IN
HL-LF IN
COIL-A IN
COIL-B IN
HL-HF IN
EDM PWR
LOCAL COM
LOCAL COM
0-5 V OUT
PULSE OUT
LOOP (–)
LOOP (+)
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