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Cannot connect to the controller via RS-232.
Probable Cause：RS-232 serial baud rate setting error or serial-USB adapter incorrect
configuration.
Solution：Check the following: 1.The RS-232 cable is straight-through, not a Null
Modem (cross-over); 2.Whether the selected RS-232 serial baud rate is suited for your
device; 3.If using a serial-USB adapter, verify that the adapter software is installed
and a serial COM port has been mapped. Check the activity light on the USB adapter
if there is. If there is no activity, the wrong COM port has been chosen or there is a
configuration issue with the adapter.
6.3 Maintenance
The following inspections and maintenance tasks are recommended at least two times
per year for best controller performance.
Check that the controller is securely mounted in a clean and dry environment.
Check that the air flow and ventilation around the controller is not blocked. Clear all
dirt or fragments on the heat sink.
Check all the naked wires to make sure insulation is not damaged for serious
solarization, frictional wear, dryness, insects or rats etc. Maintain or replace the
wires if necessary.
Tighten all the terminals. Inspect for loose, broken, or burnt wire connections.
Check and confirm that LED or LCD is consistent with required. Pay attention to any
troubleshooting or error indication .Take necessary corrective action.
Confirm that all the system components are ground connected tightly and correctly.
Confirm that all the terminals have no corrosion, insulation damaged, high
temperature or burnt/discolored sign, tighten terminal screws to the suggested
torque.
Inspect for dirt, insects and corrosion, and clear up.
Check and confirm that lightning arrester is in good condition. Replace a new one in
time to avoid damaging of the controller and even other equipments.
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