Walchem WCT400 Series Instruction Manual

Walchem WCT400 Series Instruction Manual Manual pdf 40 page image

376.2 Replacing the FusesCAUTION: Disconnect power to the controller before opening front panel!Locate the fuses on the circuit board at the back of the controller enclosure. (See figure 3.) Gentlyremove the old fuse from its retaining clip and discard. Press the new fuse into the clip, secure the frontpanel of the controller and return power to the unit.Warning: Use of non-approved fuses can affect product safety approvals. Fuse ratings depend oncontroller power rating. Specifications are shown below. To insure product safety certifications aremaintained, it is recommended that a Walchem fuse be used.F1 Fuse Walchem P/N F2 Fuse Walchem P/N5 x 20 mm, 1.0A, 250V 103163 5 x 20 mm, 6A, 250V 1028347.0 TROUBLESHOOTINGCAUTION: Disconnect power to the controller before opening front panel!Troubleshooting and repair of a malfunctioning controller should only be attempted by qualifiedpersonnel using caution to ensure safety and limit unnecessary further damage. Contact the factory.7.1 Error MessagesTEMP ERRORThis error condition will stop both conductivity and pH control. It indicates that the temperature signal from the conductivity electrode is no longervalid. This prevent controlling based upon a false pH or conductivity reading.Possible Cause Correction ActionGreen or white electrode wire disconnected. Reconnect.Faulty electrode. Replace electrode. Revert to manual temperature compensation bycycling power off and on.SENSOR ERRORThis error condition will stop conductivity control. It indicates that the conductivity signal from the electrode is no longer valid. This preventscontrolling based upon a false conductivity reading.Possible Cause Correction ActionBack or red electrode wire shorted. Disconnect short.Faulty electrode. Replace electrode.Faulty controller. Verify via failed self test.HIGH ALARMThe summary screen will display an H at the right end of the bar graph if the conductivity rises above the high conductivity alarm set point. If yourunit is wired for alarm output, the alarm relay will trip. The controller will continue to check the conductivity, and the bleed and/or feed outputs willbe allowed to be activated.Possible Cause Correction ActionDirty electrode Clean electrode (see Sect. 6.1)Faulty solenoid valve Repair or replace solenoid valve.Faulty electrode Evaluate (see Sect. 7.3). Check Temp display.Improper wiring of valve or controller Correct wiring. See Section 3.4.Conductivity rose over alarm limit while biocide lockout occurred. Allow normal bleed to occur.Clogged Y-strainer in bleed line Clean Y-strainer.Faulty bleed relay Replace relay. (Consult factory.)

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