Instruction manual

118
Other 4-20 mA Input Sensor Error
This error message is caused by a 4-20 mA input signal that is less than 3.9 mA or greater than 21
mA.
Possible Causes Corrective Actions
Faulty transmitter. Make sure that the transmitter is functioning
by measuring the output using an ammeter. If
the output directly from the transmitter is less
than 4 mA, the transmitter is the problem.
Faulty wiring between transmitter and Repeat the measurement of the transmitter
analog input option circuit board. output at the 4-20 mA input option board
terminal strip. If this is less than 4 mA, then
the wiring is faulty. Also make sure that the
wires are attached to the correct terminals as
defined in the 4-20 mA Input Page.
Faulty analog input option circuit board. Replace the 4-20 mA input option board.
Makeup Conductivity Board Failure
This error message is caused by a failure of the controller to recognize that the option circuit board
is connected. If controlling bleed based upon cycles of concentration, this error will force the
bleed relay off.
Possible Causes Corrective Actions
Poor connection of the option board to Remove the option board and inspect both
the sensor interface board mating connectors for corrosion or damage.
Reinstall the option board.
.
Faulty sensor input board. Replace the sensor input board.
pH Board Failure
This error message is caused by a failure of the controller to recognize that the option circuit board
is connected. The pH output relay will be forced off.
Possible Causes Corrective Actions
Poor connection of the option board to Remove the option board and inspect both
the sensor interface board. mating connectors for corrosion or damage.
Reinstall the option board.
Faulty sensor input board. Replace the sensor input board.