Instruction manual

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If you select Off, the relay will not activate again until either Hand or Auto is selected (or if power
is cycled)! If you select Hand, the relay will activate until either Auto or Off is selected, or until
the Hand Time Limit (programmed in the next menu) expires or until the controller power is
cycled.
The Off mode is handy to prevent the relay from activating while you are changing set points. The
Hand mode is handy to be able to test the pump or valve, wiring, etc without needing to change set
points.
Hand Time Limit
Type in the text box the maximum number of minutes that the relay can be activated in the Hand
mode. Any value between 1 and 1440 is acceptable.
Click on the “Submit” button to save the changes.
Event Log
Click on the link to view the event log. The event log contains the date and time of each relay
activation and deactivation, as well as the state of each Interlock, Level Switch, or Generic digital
input.
Type of Event
Status to generate a ‘1’ in the log
Status to generate a ‘0’ in the log
Relay output
Relay activated
Relay not activated
Interlock DI
In the Interlock state as defined in
the Interlock page
In the non-Interlock state as defined in
the Interlock page
Level Switch DI
In the Low Alarm state as defined
in the Level Switches page
In the Normal state as defined in the
Level Switches page
Generic DI –
Alarm selected
In the Alarm state as defined in the
Generic Inputs page
In the Normal state as defined in the
Generic Inputs page
Generic DI – No
Alarm selected
Switch closed
Switch open
A window will open to ask if you would like to open the file or save it to disk. Select the method
you would like to use. The file is .csv (comma separated variable) file that will open in a
spreadsheet such as Excel.
6.23 Relay (1 – 8) Output Menus – Intermittent (Proportional Blowdown Time)
Types
This page is used for boiler control where the conductivity is checked at intervals, and if found to
be above the set point, the relay is activated for a time that varies with the conductivity’s deviation
from the set point.
The following sequence occurs while sampling:
The relay activates to open the control valve, allowing a sample of the boiler water to flow past the
electrode. The valve remains open for the time programmed in Duration of Sample.
The relay deactivates, and closes the control valve. The sample is held in the pipe for the time
programmed in Hold Time.
At the end of the hold time, the controller reads the conductivity, and compares it to the set point
value.
If it is above the set point, the relay activates and opens the valve for the time calculated using the
Maximum Blowdown Time and Proportional Band.
The valve closes again and the sample is held again.