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49
Controller
Hardware and Accessories Setup and Utility
Appendix 1: Cable Remote Terminal Units (CRTU)
Troubleshooting:
Buzzer
- Each CRTU card is equipped with a beeper that indicates its operation status:
A valid card will produce a short (
½
sec) beep once every 7 seconds
Connecting card will produce long beeps (1 sec. On, 1 sec Off)
A faulty card with valid power supply (communication problem) will produce short
frequent beeps (
½
sec. On,
½
sec. Off). Every non-communicating card must be
immediately replaced.
LED analyzer
- The C2000-15 card is utilized with a pair of communication indicator
LEDs. In normal operation both LEDs will blink alternately. If the communication is
interrupted or disconnected - only the Tx led will blink.
Elimination
– The most efficient troubleshooting method. In many malfunction cases it
will be difficult to point at the faulty units even with the help of the vocal analyzing
system. The reason is that a fault in one unit may appear also as disturbing the
entire system (if the nature of the fault is high power consumption or uncontrolled
transmission).
Pulling out the plug from a unit is breaking the chain of communication to the rest of
the line. It is advised to first disconnect at a point between the suspected area and
check if the remaining part returns to normal.
If it doesn’t – try to connect just one unit directly to the controller to verify the validity of
the C2000-15 adapter. Repeat that test with at least 3 units (or one new card) before
concluding that the C2000-15 is faulty. A faulty C2000-15 should be replaced.
Line problems
- The underground laid cable may become a weak point with time. 3
different problems may occur:
1: Break – In all 3 wires or part only.
2: Short –
Between the wires of the cable.
3: Ground leak.
– From one wire or more.
Step A)
Basic cable test: Pull out all the RTUs connectors and make a bridge to line
up the entire system.
Step B)
Use Multi meter to check resistance between the wires. There should be some
resistance. If there is no resistance - case 2 is your problem . Find the faulty part
moving down the line and replace the cable in that part.
Step C)
Connect a 9V battery to 2 wires of the cable at one end. Check the voltage on the
remote end. Should the voltage drop – Case 3 is your problem. Find the faulty part moving
down the line and replace the cable in that part. Repeat that test in both combinations of wires.
Remove the battery.
Step D)
Connect 2 of the wires at one end and check electrical resistance at the
remote end. The value should not exceed 50 Ω . A higher value indicates a problem
in the cable size or length. A reading higher than 20k
Ω
indicates case 1 .
Find the faulty part moving up the line and replace the cable in that part. Repeat this
test for both combinations of wires.