46
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 4.) 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 (WPH410 & WDP410 only)
Walchem P/N
5 x 20 mm, 1.0A, 250V
103163
5 x 20 mm, 6A, 250V
102864
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
Output Timeout
This error message appears if one of the control outputs has been on longer than the maximum amount of time programmed in the
"Time Limit" menu found in the Control menus. It is reset by answering "Yes" to the "Reset Timer" prompt that will appear or by
cycling power to the controller off and back on. There are a number of possible reasons that the output could go on for longer than
normal:
Possible Cause
Corrective Action
The process went further out of control than normal.
Increase time limit or reset timer.
The chemical supply has run out.
Replenish the chemical supply.
The pump or valve or supply line is faulty.
Repair or replace the control device.
Wrong chemical is being controlled.
Replace with correct chemical.
The electrode is not responding to changes.
Replace electrode, cable or preamplifier. Evaluate mixing or
recirculation.
