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WTP Troubleshooting
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WTP Troubleshooting

This 'How To' shows three tools for compacting information into clear and concise readable forms that won't cause eye or brain fatigue.

  1. Diagrams
  2. Tables
  3. Flowcharts

Example 1 - Diagrams


Create consistency by clearly identifying specific areas in a diagram and highlighting an area that is referenced throughout the rest of the document.




To this:




 

Example 2 - TABLES

Organize categorized information into a table.

From this:

MB85 BRIDGE MUX

 

This is also in the Master WTP panel on the upper RHS. It has seven lights:

  • Ready - orange and steady on
  • Power - green and steady on
  • Modbus plus - green blinking about four times per second
  • Port 1 (our communications to Slave 2 and Slave 3) - green and blinks intermittently
  • Port 2 - local programming, green and off
  • Port 3 - remote programming, green and off
  • Port 4 - alarm dialer, green and blinking about twice per second
 
To this:



Example 3 - FLOWCHARTS

This is an example of 'extreme editing' where the original version is very wordy as if it was a transcript of a personal training session. The edited flowchart removes the verbiage and compartmentalizes the highlighted terms into boxes to show their relationship to each other from beginning to end. A much better format for use in a training class and/or in the field as a quick reference.

From this:

TROUBLESHOOTING

The lights are very useful in finding out what is wrong with the system. It is probable that you are reading this because you have received a communications fault alarm for Slave Panel 2, Slave Panel 3 or both. Note that there is a separate alarm at each end of the links so that a failure of one link should generate two alarms, but only one call out. Also note that you will be looking at lots of blinking lights. Do not be concerned about the exact sequence of blinking. It is often so fast that it is hard to tell if the was RX TX Tx Rx or Rx Tx Rx Tx. This is not important, only if you get an RX or a TX or both. During troubleshooting, be patient, watch carefully, and write down what you see so you don’t have to go back several times. A form for this is in Appendix A. Also, in many cases, the instructions will indicate that the component should be rebooted (remove power and return power). Please do not do this indiscriminately as it does provide a shock to the system and can cause damage. That is, when a person has a heart attack, a defibullator can save their lives, but if they are healthy, it can be fatal. The same is true for the communications system; do not reboot the system without suspecting that the equipment needs rebooting.

Always start at the Master WTP and review what is supposed to happen. Eventually you should come across an abnormality which means that the message has stopped at this point. It is wise to continue on at least one more point as a transmit message could be getting through but the receive is not coming back. If a station is transmitting, and the next station is not receiving, the problem is likely with one of those two devices. If it is transmitting and the next device is receiving and transmitting then you need to go down the line further. Eventually you will find out where the message is being received but not transmit. The following might further help your troubles.

WTP PLC (THE BEGINNING)

If the MB+ light (3) isn’t blinking rapidly (4 times per second or so), you have a problem with the PLC or the MB85+. If it is blinking at the PLC but not the MB85, first check the cable between the MB+ ports to ensure it has not come loose, then power off the MB85 and power it up again after 15 seconds. If it is not blinking at either end, then check that the PLC run light is on (see panel door). It is not recommended that you reboot the PLC without further advice.

MB85

Assume the MB+ light is blinking regularly but the Port 1 light is not. Check the cable between Port 1 and the Telebyte to ensure it has not come loose. Note if port 4 is blinking or not (it usually blinks twice per second). If Port 1 is not blinking and the cable is tight, power off the MB85, wait 15 seconds and power it on again. Note any changes.

To this:
 
Troubleshooting: Fault Alarm



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