37
6.2
Replacing the Fuses
CAUTION
: 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.) Gently
remove the old fuse from its retaining clip and discard. Press the new fuse into the clip, secure the front
panel of the controller and return power to the unit.
Warning:
Use of non-approved fuses can affect product safety approvals. Fuse ratings depend on
controller power rating. Specifications are shown below. To insure product safety certifications are
maintained, it is recommended that a Walchem fuse be used.
F1 Fuse
Walchem P/N
F2 Fuse
Walchem P/N
5 x 20 mm, 1.0A, 250V
103163
5 x 20 mm, 6A, 250V
102834
7.0 TROUBLESHOOTING
CAUTION: Disconnect power to the controller before opening front panel!
Troubleshooting and repair of a malfunctioning controller should only be attempted by qualified
personnel using caution to ensure safety and limit unnecessary further damage. Contact the factory.
7.1 Error
Messages
TEMP ERROR
This error condition will stop both conductivity and pH control. It indicates that the temperature signal from the conductivity electrode is no longer
valid. This prevent controlling based upon a false pH or conductivity reading.
Possible Cause
Correction Action
Green or white electrode wire disconnected.
Reconnect.
Faulty electrode.
Replace electrode. Revert to manual temperature compensation by
cycling power off and on.
SENSOR ERROR
This error condition will stop conductivity control. It indicates that the conductivity signal from the electrode is no longer valid. This prevents
controlling based upon a false conductivity reading.
Possible Cause
Correction Action
Back or red electrode wire shorted.
Disconnect short.
Faulty electrode.
Replace electrode.
Faulty controller.
Verify via failed self test.
HIGH ALARM
The 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 your
unit 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 will
be allowed to be activated.
Possible Cause
Correction Action
Dirty 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.)
