RFC-1 Troubleshooting and Factory Service page 8.1
Section 8 — Troubleshooting and Factory Service
8.1 Common Problems and Possible Solutions
Problem: The RFC-1 does not power up.
Solutions: With the ribbon cable connecting the RFC-1 and the RP-8 check for a short circuit across the 12 VAC
terminals on the RP-8. Check the wall-plug power supply for 12 VAC.
Problem: The RFC-1 powers up and responds but telemetry cannot be calibrated.
Solutions: The wrong calibration pot is being adjusted. The telemetry connections count left to right from the rear of
the RP-8 panel, but the pots are counted from right to left as viewed from the front of the panel. Channel
00 is on the far right and channel 07 is on the far left.
The channel may be programmed incorrectly. Check the fourth data location in the programming for the
channel that is not responding. Typically the value should be 0 or 1 but 4 or 5 may also be appropriate.
Other values will cause the channel to be treated as an indirect power channel where the data for the
channel is calculated from the two preceding channels instead of the DC sample on the channel input.
Problem: Telemetry works but control functions don't work. RFC-1 says, "enter control security code".
Solutions: Read the section on operation completely. The command to enable control relay functions is 66. If the
control security code has been changed from the factory setting, you will need to enter it as well.
Problem: Telemetry works but control functions don't work. The RFC-1 drops the line when a control is activated.
Solutions: This is a symptom of lightning damage. This problem can be caused by many component failures. The
most common are D18 and D19 on the relay panel; U1, U2 or U3 on the relay panel; or U6 in the main
system.
Problem: One or more telemetry channels always read "status off” regardless of the voltage on the sample.
Solutions: Telemetry samples are polarity sensitive. Make sure that the telemetry sample is connected properly.
The calibration pot may be turned all the way down. These pots are 22 turns from end to end. They do
not stop turning at the ends. A clutch protects the internal mechanism.
When a system is damaged by lightning, it may be unable to switch the relays necessary to select a
telemetry sample. The system will need to be repaired by a knowledgeable technician.
Problem: One or more telemetry channels always reads "status on" regardless of the voltage on the sample.
Solutions: The calibration pot is turned up too high. These pots are 22 turns from end to end. They do not stop
turning at the ends. A clutch protects the internal mechanism.
When a system is damaged by lightning, it may be unable to switch the relays necessary to select a
telemetry sample. The system will need to be repaired by a knowledgeable technician.
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