Troubleshooting, continued
86
You can measure the ground current with a Clamp Ampmeter (set in the 50 Hz mode) on the
wire to the ground rod. If the current is 20 mA or less there is no reason to worry. But, if the
current is above 20 mA, you can locate the ground fault with a Clamp Ampmeter.
Turn off any running Programs or Schedules. Please see Operating the Irrigation Programs on
page 49. Connect both communications wires to the L1 terminal inside the controller. Attach
the clamp from a Clamp Ampmeter to the L1 terminal. With no decoders using power, the line
voltage should read zero (0). Any reading other than zero (0) is ground current. If the reading is
above 20 mA, track it along the cable until the current disappears. Once the current disappears,
you have passed the leakage point. This procedure only works for one or two shorts. If there are
several minor shorts you will not be able to see the sudden drop in the leakage current when
you pass the fault.
Problem The clock shows an incorrect time after a power outage.
Solution When the power goes out, a back-up battery powers the controller’s clock. The battery is in a
battery holder on the main board. The clock and the memory use the battery only when the
controller is turned off or without power. The battery life is normally around 10 years. If the
time is incorrect, replace the battery. Please see Replacing the Battery on page 15.
If the fault is not in the battery, either the main board or the power supply is defective. Replace
the controller.
Problem The controller is loosing installation data and irrigation schedules.
Solution The controller’s installation data and irrigation schedules are stored in S-RAM, which needs
power to hold data. When the Mains power is off, the battery supplies the power for the
memory. If it can no longer do this, replace the battery. Please see Replacing the Battery on
page 15.
If you replace the controller, you will need to retrieve the installation and irrigation data from
the old board. Please see Replacing the Controller on page 89.
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