5/31/96
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REQUIRED READING !!!!!
Before wiring the LINK 2000 Meter, install the shunt as indicated.
All wiring should be done before installing the fuse.
GENERAL NOTES
1) Wiring to the LINK 2000 Meter should be #16 or #18 AWG. (Larger is OK, but not
necessary.) Wiring should be per NEC or applicable standards.
2) The Shunt Sense Leads should be a twisted pair. Leads up to 1,000 feet long may be
used if they are not run along with other noise producing conductors. Offset error should
be less than 0.2 Amps.
For the easiest installation you may wish to purchase our four twisted pair cable with
the same color code as the meter. This cable may be run between the meter and the batteries
to supply all needed signals. This cable is available from your dealer, Heart Interface, or
from Cruising Equipment in lengths of 25' or 50'.
Note: You may make your own twisted pair wire by chucking up two wires in an electric
drill motor and twisting them by running the drill motor until there is a twist every inch. A
wrap of tape every 16" will keep the wires together and make them easier to pull through
the raceway.
3) Caution! If your starter draws more than 500 amps see #5 below.
4) Battery current is sensed with a shunt which is a very precise, small, resistance. It is
inserted in series (in line) in the negative wire of the circuit you wish to measure. The
current is measured by sensing the voltage drop across this resistance. The LINK 2000
uses a 50 mV, 500 Amp shunt. When 500 Amps flows through the shunt, there is a 50
mV drop across it. Thus 10 Amps equals 1 mV or 1 Amp equals .1mV The display is
scaled to read amps. If you wish to check this you will need a very accurate digital meter
(Fluke 87 in 4 1/2 digit mode or better) if the current is below 30 Amps (3.0mV). Above
50 Amps most digital meters can be used for testing.
5) Note for Marine and RV installations: If starter current exceeds 500 amps, the starter
negative must be connected to the battery side (BSHB) of the battery shunt so that starter
current does not flow through it. The problem with this is that if the alternator is of the
grounded case type its current will not be flowing through the shunt. The alternator ground
must be isolated from the engine and run to the load side (BSHG) of the battery shunt to
be able to measure the current going into the battery from the alternator. Isolated negative
CAUTION!!!!
The output voltage of the shunt is very small. It is critical that all of the
connections for the shunt sense leads have the highest possible integrity. Every
effort must be made to prevent corrosion that might affect the sense leads.
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