
MODEL 54e pH/ORP | SECTION 8.0 |
| TROUBLESHOOTING |
SECTION 8.0
TROUBLESHOOTING
The Model 54e pH/ORP automatically searches for fault conditions that would cause an error in the meas- ured pH reading. If such a condition occurs, the current outputs and alarm relays will act as configured in Section 5.6 and Section 5.7, the red "FAIL" LED on the controller panel will be lit and a diagnostic message will be displayed. If more than one fault exists, the display will sequence through the diagnostic messages. This will continue until the cause of the fault has been cor- rected or until the Ack 2 key is pressed.
Troubleshooting is easy as 1, 2, 3…
Step 1 Look for a diagnostic fault message on the dis- play to help pinpoint the problem. Refer to Table
Step 2 Refer to the Quick Troubleshooting Guide, Table
Step 3 Follow the step by step troubleshooting approach offered in Table
CAUTION
Do not attempt to troubleshoot unless you have familiarized yourself with this manual. Only trained, qualified techni- cians should perform these procedures. Do not attempt to troubleshoot, repair, or modify the printed circuit cards or elec- tronic components inside the controller.
IMPORTANT
Always recalibrate the controller before returning it to service.
Many control problems are unrelated to the pH meas- urement system. When problems arise, first check other systems that affect chemical concentration. Consider what may have changed in the system that can cause poor control. Some causes for poor control other than controller malfunction are:
1.An empty chemical drum.
2.Malfunction of a chemical feed pump, pump motor, or motor starter.
3.Water inlet or drain valves stuck or left open by operators.
4.Check flow interlocks (if used).
5.A temperature control malfunction.
6.Broken or blocked chemical feed lines.
7.A conductivity probe that has been left out of the bath.
8.The level of bath is below the probe and the probe is dry.
9.The probe needs to be cleaned.
10.The condition of the incoming metal has changed, i.e., temperature, cleanliness, speed.
11.The condition of the incoming water has changed, i.e., temperature, cleanliness, flow rate, hardness, pH.
12.Unauthorized personnel have tampered with the controller settings.
13.Standardizing procedure is not accurate due to a malfunctioning laboratory instrument or contami- nated chemical standard solutions.
WARNING
To prevent chemical feed into the process or injury to operating personnel, disconnect or disable the chemical feed pump and other external devices while you are servicing and troubleshooting the controller.
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