Vivax Metrotech vLocDM, User Handbook Manual

Page: 16 / 54

Page 10 of 47
4. If there is no mains socket, it is possible to use the DC output of the transformer rectifier. See diagram below.
5. Adjust the transformer output to approximately 40V DC (although the unit will function from 12V DC to 60V
DC) and use the DC input lead to connect the transmitter to the transformer terminals.
6. With the output lead connected to the transmitter, connect the Red wire to the lead connecting to the
pipeline. Connect the Black wire to the lead connecting to the anode bed. See diagram above.
4 Transmitter Functions and Operations
4.4.2 Connecting to the Pipe when there is No Access to a CP Station
4.4.2.1 Sacrificial Anode
Very often the cable connecting a sacrificial anode to a pipe is fed through an above ground connection box. If
this is the case the anode can be disconnected and these cables used to connect the transmitter to the pipe.
The Red connection lead needs to be connected to the pipe side and the Black to the sacrificial anode.
It will be necessary to power the transmitter either from a portable 110V AC mains generator, or from a vehicle
car battery or external 12V DC power source.
4.4.2.2 Connecting at a Point where Access to the Pipe is Possible
It is possible to connect the transmitter at any point along the pipe length where an electrical connection is
possible. If this is the case a good independent ground will need to be generated by driving a ground stake
into the ground a few meters perpendicular to the pipe. The ground needs to be low impedance so the copper
ground rod needs to be at least 0.5 meters long. In some cases multiple stakes may be necessary.
A poor ground will result in the transmitter showing the over voltage alarm even at low currents. If this occurs
add further ground rods connected in parallel and dampen the surrounding soil.
NOTE
It may not be possible to attain high current from the transmitter, as a sacrificial anode will
not provide as good a ground as a system anode bed.
NOTE
If the output leads are white and green, the white cable should be connected to the pipe.