Walchem WebMaster Instruction Manual download pdf (Page 40)

5.5 Relay Control (HOA)

This menu will present you with a list of each relay. To the right of the name of the relay will be

an indication of the current state of the relay (OFF, or ON). To the right of this, the display will

show either the time that the relay has been on, counting up (if the relay is responding to set point,

and the time for the relay to shut off is unknown) or the time that has left to be on, counting down

(if the relay has been activated by a timer, and the controller knows when it will shut off). Below

the name of the relay will be the words “HAND” “OFF” and “AUTO”, each with a radio button to

the left of the word. Use the Next key to move the cursor to the line containing the radio buttons.

Use the Left Arrow and Right Arrow keys to move the cursor to the desired relay mode. Press the

Enter key to change the mode of the relay.

If the relay is in the AUTO mode, then it will respond to the set points or other programmed

parameters. This is the normal mode for the relay to be in.

If the relay is in the OFF mode, then the relay will be open regardless of whether the programming

of the controller dictates that the relay should be ON or OFF. IF THE POWER TO THE

CONTROLLER IS CYCLED OFF AND BACK ON, THE RELAY WILL REVERT BACK TO

AUTO MODE.

If the relay is in the HAND mode, then the relay will be closed regardless of whether the

programming of the controller dictates that the relay should be ON or OFF. If a Hand Time Limit

has been programmed in the controller, the relay will shut off after this time has elapsed, and the

mode will revert back to AUTO.

5.6 Set Points

This menu is used to adjust any of the control set points for the relays that are simple entries of

numbers. Any configuration of feed control modes (for example, bleed and feed versus feed based

on makeup volume) or biocide cycles (for example, changing from daily to weekly adds), etc. may

NOT be changed using the keypad. These types of changes require a computer to accomplish.

Pressing the Enter key with Set Points highlighted will bring you to this display:

SET POINTS

Bleed Set Points

Feed Set Points

Biocide 1 Set Points

Biocide 2 Set Points

Dispersant Set Point

pH Set Points

ORP Set Points

Pressing Next moves the highlight down the list, while Prev moves the opposite direction. Press

Enter to go into the highlighted menu. Press Exit to return to the Main Menu.

Bleed Set Points

Set Point xxxxx (if Bleed based on system conductivity or 4-20 mA input)

Use the arrow keys to change the conductivity (or ppm) value at which you want the bleed valve to

open. Any value between 0 and 10,000 is acceptable (if based on conductivity). If the control

mode is based on a 4-20 mA input, then the set point value is limited to the range of the 4-20 mA

input. Press Enter to accept the changes.

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Walchem WebMaster Instruction Manual Page 40