71
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. In Range will activate the relay when the input reading is
between the two set points. Out of Range will activate the relay when the input reading
is outside the two set points.
5.3.12
Relay, Timer Control Mode
ONLY AVAILABLE IF HVAC MODES ARE DISABLED IN CONFIG MENU – GLOBAL SETTINGS
Basic Timer Operation
When a timer event triggers the algorithm will activate the relay for the programmed time.
Special Condition Handling
Overlapping timer events
If a second timer event occurs while the first one is still active, the second event will be ignored. An Event
Skipped alarm will be set.
Interlock Conditions
Interlocks override the relay control, but do not change the operation of the timer control.
A digital input or output interlock condition does not delay the relay activation. The relay activation duration
timer will continue even if the relay is deactivated due to an interlock condition. This will prevent delayed events
which can potentially cause problems in they do not occur at the correct time.
“Activate With” Conditions
“Activate with channels” settings override the relay control, but do not change the operation of the timer control.
The relay activation duration timer continues counting when the timer relay is forced on, and ends at the expect-
ed time (event start time plus duration). If the “activate with” condition continues after the end of the event time,
the relay remains activated.
Alarms
An Event Skipped alarm is set when a second timer event occurs while one event is still running.
An Event Skipped alarm is also set when the timer relay never turns on during an event because of an interlock
condition.
The alarm is cleared when the relay is next activated for any reason (the next timer event or HAND mode or
“activate with” force on condition).
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, relay type and the current control mode setting. The cur-
rent week number and day of the week is displayed (even if there is no multi-week repetition event programmed).
Cycle Time shows the time counting down of the currently active part of the timer cycle.
Interlock Conditions
Interlocks override the relay control, but do not change the operation of the timer control.
A digital input or output interlock condition does not delay the relay activation. The relay activation duration timer
will continue even if the relay is deactivated due to an interlock condition. This will prevent delayed events which
