Tempo Communications 521E Manual De Instrucciones página 9

Tempo Communications
Two-Step Solenoid Valve Locating Process
Solenoid valves can easily be located provided all the wires leading to them
are intact and the solenoid itself is still good.
Step 1. Start at the clock. Connect the red transmitter lead to the station wire
leading to the subject valve, and connect the black lead to earth ground.
Turn the transmitter on, adjust the output to the highest level, assemble the
receiver, locate the path, and start tracing the wire following the null. The null
will be present until you pass over a solenoid valve, and then the signal will
become extremely strong.
Mark this spot. Check around this hot spot for a null leaving the area. If the null
continues, follow it and mark any additional hot spots. (Refer to Figure 6.) If
only one hot spot or valve is located, it will be the valve in question.
Step 2. If more than one hot spot is found, mark them and return to the
transmitter and turn it off. Lift the black lead from the ground stake and
connect it to the common wire. Turn the transmitter on, set the selector knob
to the highest reading, and return to the first hot spot with the receiver. Touch
the tip of the receiver antenna to the ground in the center of the first hot spot
and set the sensitivity knob to read near mid-scale. Now go to the second spot
and without touching the sensitivity knob, check the strength of the signal at
each hot spot and determine which, out of all of them, is the strongest signal.
This is the valve for the station wire you are connected to.
Digitally Addressable (Two-Wire)
Systems
521E can be used with digitally
addressable irrigation wiring but it
is wise to apply a few rules to avoid
damaging decoders. Decoders are
designed to be tough enough to
withstand normal surges and spikes
that can be present on wiring buried
in the soil, but the direct application
of the 521E maximum output voltage
may cause damage. Damage like this
can be avoided by applying a few
simple tips.
When it comes to using locators on
2-Wire irrigation systems, whether
Figure 6. Locating Broken Wire End
you use the 501 Tracker II Cable Locator or 521E Wire and Valve Locator to
trace the 2-Wire path, the best practice is always to disconnect from the
controller and clip one transmitter lead to both decoder wires together, then
clip the other transmitter lead to a ground stake pushed into the ground
(ideally off to the side of the route of the cable). This ensures the best signal
and is safest for decoders.
9 521E Instruction Manual