Walchem WTCW100 Series Instruction Manual

Contents

Walchem WTCW100 Series Instruction Manual Manual pdf 23 page image

40 415.3.11 Relay or Analog Output, Manual ModeOutput DetailsThe details for this type of output include the relay on/off state or analog output %, HOA mode or Interlock status,accumulated on-time, alarms, current cycle on time and relay type.SettingsA Manual relay will activate if the HOA mode is Hand, or if it is Activated With another channel. There are no addition-al programmable parameters.5.3.12 Relay, Pulse Proportional Control ModeONLY AVAILABLE IF W120 MODEL/POWER RELAY BOARD IS INSTALLEDOutput DetailsThe details for this type of output include the relay pulse rate, HOA mode or Interlock status, accumulated on-time,alarms, current cycle on time and relay type.SettingsPress the Settings key view or change the settings related to the relay.Set point Enter the sensor process value at which the output will pulse at the Minimum Output %set below.Proportional Band Enter the distance that the sensor process value is away from the set point beyond whichthe output will be pulsing at the Maximum Output % set below.Minimum Output Enter the lowest possible pulse rate as a percentage of the Maximum Stroke Rate setbelow (normally 0%).Maximum Output Enter the highest possible pulse rate as a percentage of the Maximum Stroke Rate set below.Maximum Rate Enter the maximum pulse rate that the metering pump is designed to accept (10 - 360pulse/minute range).Input Select the sensor to be used by this relay.Direction Set the control direction.5.3.13 Relay, Dual Set Point ModeOutput DetailsThe details for this type of output include the relay on/off state, HOA mode or Interlock status, accumulated on-time,alarms, current cycle on time and relay type.SettingsPress the Settings key view or change the settings related to the relay.Set point Enter the first sensor process value at which the relay will activate.Set point 2 Enter the second 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 theresponse of the sensor to chemical additions is slow. Specify the amount of time for thecycle, and the percentage of that cycle time that the relay will be active. The relay will beoff 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 ifuse 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 to100 if use of a duty cycle is not required.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 isbetween the two set points. Out of Range will activate the relay when the input reading isoutside the two set points.5.3.14 Relay, Probe Wash Control ModeBasic Timer OperationWhen a Probe Wash event triggers, the algorithm will activate the relay for the programmed time. The relay willactivate a pump or valve to supply a cleaning solution to the sensor or sensors. The output of the selected sensors willeither be held or disabled during the cleaning cycle, and for a programmable hold time after the cleaning cycle.Special Condition HandlingOverlapping timer eventsIf a second timer event occurs while the first one is still active, the second event will be ignored. An EventSkipped alarm will be set.Interlock ConditionsInterlocks 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 durationtimer will continue even if the relay is deactivated due to an interlock condition. This will prevent delayedevents 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 timercontrol. The relay activation duration timer continues counting when the timer relay is forced on, and ends at theexpected time (event start time plus duration). If the “activate with” condition continues after the end of the eventtime, the relay remains activated.AlarmsAn Event Skipped alarm is set when a second timer event occurs while one event is still running. An EventSkipped 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 DetailsThe details for this type of output include the relay on/off state, HOA mode or Interlock status, accumulated on-time,alarms, current cycle on time and relay type. The current week number and day of the week is displayed (even ifthere is no multi-week repetition event programmed). Cycle Time shows the time counting down of the currentlyactive part of the cycle.SettingsPress the Settings key view or change the settings related to the relay.Event 1 (through 10) Enter these menus to program timer events via the menus below:Repetition Select the time cycle to repeat the event: Hourly, Daily, 1 Week, 2 Week, 4 Week, orNone. An event means that the output is turned on at the same time of day, for the sameamount of time, and except for the Daily cycle, on the same day of the week.Week Only appears if Repetition is longer than 1 Week. Select the week during which the eventwill occur.Day Only appears if Repetition is longer than Daily. Select the day of the week during whichthe event will occur.Events Per Day Only appears if Repetition is Hourly. Select the number of events per day. The eventsoccur on the Start Time and then evenly spaced throughout the day.Start Time Enter the time of day to start the event.Duration Enter the amount of time that the relay will be on.Input Select the sensor that will be washed.Input 2 Select the second sensor, if applicable, that will be washed.