Walchem W600 Series Instruction Manual page 69

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 expected
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 "acti-
vate 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, current cycle on time, relay type and alarms. The current 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 cycle.
Settings
Press the Settings key view or change the settings related to the relay.
Set point
Spike Set point
Deadband
Onset Time
Duty Cycle Period
Duty Cycle
Event 1 (through 8)
Repetition Select the time cycle to repeat the event: Daily, 1 Week, 2 Week, 4 Week, or
Enter the sensor process value at which the relay will activate.
Enter the sensor process value at which the relay will activate during the Spike
Event time.
Enter the sensor process value away from the set point at which the relay will
deactivate. The same Deadband is used for the normal Set Point and the Spike
Set Point.
The onset time determines when the duration timer starts. If set to zero, the du-
ration time starts immediately. If set higher than that, the controller will not start
the duration timer until the spike set point is achieved, or until the onset time is
over, whichever comes first.
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 Period in minutes:seconds in this menu. Set
the time to 00:00 if use of a duty cycle is not required.
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.
Enter these menus to program spike events via the menus below:
None.
An event means that the output is turned on at the same time of day, for the
same amount of time, and except for the Daily cycle, on the same day of the
week.
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