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Daily Max Time
Enter the maximum amount of accumulated on-time, in Hand or Auto modes, that the
relay can have between midnight and midnight the next day. If the time is exceeded, the
relay will deactivate, and a Daily Max Timeout alarm will be triggered. The alarm will
clear, and relay allowed to reactivate at midnight the next day.
If the relay was in Hand mode when the alarm was triggered, it will revert to whichever
HOA state it was in prior to being set to Hand.
To override the Daily Max Limit for the rest of the day, press Reset Output
Timeout.
5.3.22
Relay or Control Outputs, On/Off Disturbance Control Mode
On/Off control mode is enhanced to add a disturbance input that is multiplied by the user-entered setpoint. An ex
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ample of this might be the control of a corrosion inhibitor containing PTSA based upon a fluorometer sensor input,
with the setpoint modified based upon a corrosion sensor Disturbance Input, so a higher corrosion reading results
in more corrosion inhibitor being fed. Another example might be cooling tower conductivity control on cycles of
concentration, with the cycles setpoint modified by a Disturbance Input of Makeup Conductivity.
Output Details
The details for this type of output include the relay on/off state, HOA mode or Interlock status, accumulated on-
time, alarms related to this output, current cycle on time, input value, current setpoint, disturbance input value,
relay type, and the current control mode setting.
Settings
Touch the Edit icon to view or change the settings related to the relay.
Set point
Enter the sensor process value at which the relay will activate.
Deadband
Enter the sensor process value away from the set point at which the relay will
deactivate.
Duty Cycle Period
Using a duty cycle helps to prevent overshooting the set point in applications where the
response of the sensor to chemical additions is slow. Specify the amount of time for the
cycle, and the percentage of that cycle time that the relay will be active. The relay will
be off for the rest of the cycle, even if the set point has not been satisfied.
Enter the length of the duty cycle in minutes:seconds in this menu. Set the time to 00:00
if use of a duty cycle is not required.
Duty Cycle
Enter the percentage of the cycle period that the relay will be active. Set the percentage
to 100 if use of a duty cycle is not required.
On Delay Time
Enter the delay time for relay activation in hours:minutes:seconds. Set the time to
00:00:00 to immediately activate the relay
Off Delay Time
Enter the delay time for relay deactivation in hours:minutes:seconds. Set the time to
00:00:00 to immediately deactivate the relay
Input
Select the sensor to be used by this relay.
Direction
Select the control direction.
Disturbance Input
Select the virtual input or analog output to be multiplied by the control setpoint.
