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ChronTrol XT Series User Manual Download Page 49

ChronTrol

XT Series Timers

User's Guide

47

Overlapping Midnight

You may need to consider how the 

Day Omission

 feature affects a program

with ON and OFF times that overlap midnight.

For instance, suppose you enter a program schedule which begins at 9:30 p.m.
and ends at 12:30 a.m. Monday through Friday (omitting Saturday and
Sunday).  The event which begins on Friday at 9:30 p.m. will not end at 12:30
a.m. the next day because the next day is Saturday, and Saturday has been
omitted.  Since Sunday is also omitted, the next time the program will turn
OFF is 12:30 a.m. Monday morning,

If the program must finish its execution on the omitted day (Saturday), and
not turn ON that day, a second program must be entered.  This program would
need to turn OFF at 12:30 a.m. and omit all days of the week but Saturday.

Cycles and Daylight Saving Time

This section discusses the difference between a 

day

 and a 

24-hour

 period and

how 

Daylight Saving Time

 affects programmed events occurring during the

“changeover” hour.

A “day” begins at midnight (12:00:00 a.m.) and ends just before midnight
(11:59:59 p.m.) Ordinarily this is 24 hours, except when Daylight Saving
Time begins and ends.  A “24-hour” period, on the other hand, is exactly that:
24 hours between occurrences of an event.

You may need to consider how Daylight Saving Time will influence both day-
based programs and 24-hour-based programs whenever an event occurs
during the changeover hour.

Day-Based Programs at the Start of DST

On the first day of Daylight Saving Time (2 a.m. on the first Sunday in April),
a day-based program that occurs each day at 2:30 a.m. will occur at 3:30 a.m.
because the clock advanced 1 hour at 2 a.m.  On the second day of Daylight
Saving Time the event will occur when the clock reads 2:30 a.m., but only 23
actual hours will have elapsed since its last occurrence.

Any event scheduled to occur later in the hour between 2 and 3 a.m. than
an event occurring between 3 and 4 a.m. will occur “out of order” in the
changeover hour.

  For instance, an event scheduled for 3:15 a.m. will occur

half an hour BEFORE an event occurring at 2:45 a.m.  This happens because
ChronTrol runs these two hours at the same time.

Summary of Contents for XT Series

Page 1: ......

Page 2: ...e external interference can in rare situations cause random behavior of this device Do not use this timer in applications where random ON or OFF signals are potentially hazardous WARNING If using this timing device in a situation or environment that is critical to the welfare and or sustenance of laboratory specimens please test all programs by carefully simulating or staging the critical events T...

Page 3: ... for programming the XT These sample programs illustrate the most common and direct programming techniques Appendix A Special Programming Considerations discusses Interval Timing the difference between a day and a twenty four hour period Day Omission the Daylight Saving Time standard and the effect each of these has on programmed operations Conventions Used in the Manual BOLD CAPS Represent keyboa...

Page 4: ...Week 14 Lock Code 14 Set the Lock Code 14 Lock the Keyboard 14 Unlock the Keyboard 15 Change the Lock Code 15 Clear the Lock Code 15 Manual Operation 16 Manually Switching a Circuit 16 Manually Activating a Program 16 Two Simple Programs 17 Section 3 Programming Procedures Features 18 On Off and Interval Programs 18 Circuits and Other Control Assignments 19 Day Omission 19 Cycle Length 19 Calendar...

Page 5: ... Editing the Holiday List 28 Review 29 System Parameters Review 30 Review Date 30 Review the Day of Week 30 Review the Holiday List 30 Review the Seconds 30 Program Review 32 Begin Program Review 32 Step A Program Status 32 Step B Control Assignments 32 Step C On Time 32 Step D Off Time 33 Step E Interval Length 33 Step F Omitted Days 33 Step G Cycle Length 33 Step H Exit Program Review 33 Input R...

Page 6: ...gram with Cycle Length 40 Sample Program 6 On Off Program with Day based Cycle 40 Sample Program 7 24 hour based Program 41 Sample Program 8 Program Controlling Program 42 Sample Program 9 Using Inputs 43 Sample Program 10 Re trigger and Time Out 44 Sample Program 11 School Bells 45 Sample Program 12 Delay Program 45 Appendix A Special Programming Considerations Interval Timing 46 Overlapping Midn...

Page 7: ...ts versatile calendar automatically adjusts for leap years Daylight Saving Time and holidays Programs are easy to set review and change through the 24 pushbutton audible keyboard The XT family includes four basic models table top wall mount expandable wall mount and rack mount Table top models are available with two or four circuits AC outlets or dry contacts All other models are available in two ...

Page 8: ...o one year They can also switch on and off on specific dates or one time only responding to either clock time or outside signals Program Review Verification and Change The XT allows you to review verify and change any and all of its settings You can review individual programs and input settings You can also review specific information such as the activity of a Control Assignment and the programs o...

Page 9: ...ls as well Locking Keyboard The XT provides a locking keyboard With a user programmable Lock Code you can prevent unauthorized access to the XT keyboard Power Fail Protection The Time of Day continues to operate with crystal accuracy during power failure A nine volt battery keeps the clock operating and protects the system memory to prevent the loss of stored programs When power returns all ON and...

Page 10: ...T controller and define the function of each The XT Display The XT s display serves two functions ordinarily it displays the current Time of Day in hours minutes and seconds but during programming it confirms entries and reviews previous settings Figure 1 illustrates the XT Display and Indicators Figure 1 XT Display and Indicators ...

Page 11: ...cate days omitted from a program bottom segments indicate the current day of the week and whether that day is a holiday See The XT LED Indicators for further information Numbers on the display express time dates durations and control assignment specifications the number of a circuit program or input Letters and symbols however convey specific information to the XT user See Table 1 on the following...

Page 12: ...lay which is the first step in all programming sequences F FUNCTION This character displays when setting or reviewing the Sequence Start or Daylight Saving Time functions This character displays to separate key characters from their identifying number for example P 04 Program 4 to indicate you reached the end of a list of control assignments or Holidays to show that no value was previously assigne...

Page 13: ...tc The rightmost character H represents Holiday Day of Week Stroke The bottom segment of a display character or stroke lit individually above a labeled day of the week indicates the current day of the week and whether that day is also a Holiday Day Omission Label This label shows which Day of the Week is omitted Day Omission Stroke The top segment of a display character or stroke lit individually ...

Page 14: ...F time switches a circuit manually OFF or displays the countdown to an OFF time CYCLE Sets and reviews a program s cycle length DATE Sets and reviews calendar functions PROGRAM Sets and reviews a program s or input s program assignment INPUT Sets and reviews input definitions ENTER Reviews and stores program information REVIEW INTERVAL Sets and reviews a program s interval length CIRCUIT Sets and ...

Page 15: ...ionally the Lock Code Time 1 Press TIME The display goes blank 2 Set the current time in hours and minutes For example to set the time to 2 45 p m press 2 4 5 3 Optional Press SECOND Set the seconds Seconds display in the two rightmost digits of the display window 4 The timer assumes a m so use the AM PM key to specify p m Skip this step if the time is a m 5 Press ENTER The time is set and display...

Page 16: ...y is displayed Lock Code You can set a Lock Code to prevent unauthorized or accidental entries If the keyboard is locked the timer cannot be programmed without first entering the Lock Code The timer cannot be locked if a Lock Code has not been set Set the Lock Code 1 Press LOCK The display is blank 2 Set your own Lock Code up to four digits The Lock Code displays 3 Press ENTER The Lock Code is set...

Page 17: ...Code The Lock Code displays 3 Press LOCK The display is blank 4 Set your new Lock Code up to four digits The new Lock Code displays 5 Press ENTER The new Lock Code is set and the Time of Day displays 6 Optional Press LOCK The keyboard locks and the Time of Day displays Remove the Lock Code 1 Press LOCK 000 displays 2 Enter your Lock Code The Lock Code displays 3 Press LOCK The display is blank 4 P...

Page 18: ...ircuit switches and the Time of Day displays Manually Activating a Program You can activate or deactivate any program using the keyboard at any time At initial start up all of ChronTrol s 20 or 40 available programs are active However they can be turned off and left inactive but kept in memory While inactive On Off Programs will continue to cycle at the rate you specified but they will have no eff...

Page 19: ...102 displays 9 Press ENTER to store the last entry P 02 displays 10 Press TIME to exit the program and return to the Time of Day display Now you could sit and wait for 1 00 p m to arrive OR you could set an Interval Program to turn Circuit 1 ON for 2 minutes RIGHT NOW Set an Interval Program to turn Circuit 1 ON for 2 minutes as follows 1 Press ENTER E displays in the window 2 Press ENTER again to...

Page 20: ...ts at the same time every day unless the Day Omission or Cycle Length features are used Time settings can also be set to occur on a specific date in the upcoming year or to begin on one date and end on another If your application requires any of these settings familiarize yourself with the Day Omission Cycle Length and Calendar features An Interval Program does not use real time settings but is ac...

Page 21: ...ays in the Holiday List Programs can also be set to run only on holidays by omitting Days 1 through 7 Cycle Length By using the Cycle Length feature programs can be set to repeat at a rate as short as every two seconds one second ON and one second OFF or as long as every 365 days The Cycle Length feature is used to set an On Off Program to repeat at a rate other than every day or to set an Interva...

Page 22: ...bitrary until you perform Step 6 which exits the programming procedure Between the first and last steps it isn t necessary to follow the sequence Figure 6 illustrates programming logic It is a flowchart for program entry Figue 6 Programming Logic ASSIGN PROGRAM NUMBER SPECIFY CONTROL ASSIGNMENTS ON OFF INTERVAL or ON OFF INTERVAL SPECIFY SPECIFY INTERVAL ON AND OFF TYPE AND TIMES AND DURATION DATE...

Page 23: ...uring any step press TIME and start over Be aware that pressing TIME does not clear settings you ve already made in an aborted programming attempt Settings remain in memory until corrected REMEMBER The Time of Day can be displayed in either a 12 or 24 hour format and all program settings display in the same format REMEMBER The timer will not accept an entry that s out of range ...

Page 24: ...r dry contact outputs ON or OFF assign them to the program as follows 1 Press CIRCUIT C displays 2 Type the number of the circuit C n displays where n is the number of the circuit specified Repeat this procedure until all the circuits are assigned Program Assignment If you want this program to activate or de activate other programs assign them as follows 1 Press PROGRAM P displays in the window 2 ...

Page 25: ...terval Program 0 3 you want 2 Set the duration or interval length in hours and minutes HHMM The interval length displays Press 0 if Interval is less than one minute 3 Optional Press SECOND 00 displays in the two rightmost digits 4 Optional Set the desired seconds The seconds display in the two rightmost digits 5 Optional Press DATE A dash displays if no previous setting was made 6 Optional Enter t...

Page 26: ... be entered since the next occurrence of the date is assumed The date displays OFF Time Specify the time at which you want this program to turn off as follows 1 Press OFF A dash displays if no previous Turn Off time has been set for this program 2 Set the desired Turn Off time in hours and minutes HHMM The Turn Off time displays 3 Optional Press SECOND 00 displays in the two rightmost digits 4 Opt...

Page 27: ...g 0 CLEAR removes all days Step 5 Specify Cycle Rate Specify the rate if any at which you want this program to repeat See Appendix A Special Programming Considerations for a discussion of cycle lengths of 24 hours or more 1 Press CYCLE A dash displays if no previous setting has been made If Cycle contains only a whole number of days Day based skip to 5 2 Set the desired cycle length in hours and m...

Page 28: ...f Program could disable the input to prevent wasting energy outside business hours Wiring instructions for the input connector are contained in the SPECIFICATIONS AND INSTALLATION sheet included with units equipped with this option Setting Inputs If your ChronTrol is equipped with the N8 option you have eight inputs to use to trigger switching events The following procedure describes how to set In...

Page 29: ...by your ChronTrol timer Functions cannot be switched manually Currently there are two functions available Function 1 Daylight Saving Time Function 2 Sequence Start Function 1 Daylight Saving Time Function 1 moves the Time of Day clock forward by one hour at 2 a m on the first Sunday in April and moves it back one hour at 2 a m on the last Sunday in October Function 1 is automatically enabled when ...

Page 30: ... edit the Holiday List follow this procedure 1 Press DAY OMIT then DATE H appears on the display 2 If creating a new list type the month and day MMDD of each holiday Press ENTER after each date 3 To delete a date from the Holiday List press ENTER repeatedly to scroll through the list until the date to be deleted is displayed Then press CLEAR followed by ENTER The display now shows the next date in...

Page 31: ...d by pressing the specific keys which were used when first entering the program As long as no new values are entered no changes are made to the program You can review the status of a program what it controls its On time Off time interval length list of omitted days and cycle length Input Review If your XT is equipped with inputs you can review the status of an input enabled or disabled and what it...

Page 32: ...e Holidays appear in numerical order beginning with March 1 Pressing DATE followed by REVIEW at any time returns you to the first date in the list 3 Press TIME to return to the Time of Day display Review Seconds 1 Press SECOND The seconds display in the two rightmost digits 2 Press TIME The display returns to hours and minutes Status Display for Program Review and Input Review Figure 7 on the next...

Page 33: ...ates ON only Interval Program 2 Interval Program Activity Indicator dash Indicates Interval Program is executing However a dash after a dash or P is only a separator blank Indicates Interval Program is not executing 3 Program or Input Number 4 Activity Indicator Lights when program under review is active or when input under review is enabled For example P 04 indicates that the program under review...

Page 34: ...Press REVIEW Program status displays See Figure 7 for status information 2 Proceed to any of Steps B H Step B Control Assignments You can review the list of circuits programs and inputs controlled by this program 1 Press CIRCUIT then REVIEW The first assignment displays If no assignments are set or you reach the end of the list a dash appears on the display 2 Press REVIEW repeatedly to move throug...

Page 35: ...s minutes seconds 3 Optional Press DATE to review the interval length in days if any 4 Proceed to any of Steps A H Step F Omitted Days 1 Press DAY OMIT to review skipped days See LED Indicators in Section 1 for display information 2 Proceed to any of Steps A H Step G Cycle Length If no cycle length is set an On Off Program turns ON and OFF at the same time each day except skipped days To review a ...

Page 36: ...ent is turned OFF by this input 5 Press REVIEW repeatedly to move through the list one entry at a time Assignments display in numerical order Pressing CIRCUIT followed by REVIEW at any time returns you to the beginning of the list 6 To exit the review at any time press TIME Cross Reference Review Cross Reference review is a quick way to identify which programs and inputs control a given Control As...

Page 37: ...am press ENTER repeatedly until the specific program you wish to view in Countdown Mode displays 3 Press TIME The Time of Day displays 4 Press ON to review the time remaining until the control assignment is turned ON or press OFF to review time remaining until control assignment is turned OFF NOTE For Interval Programs Type 2 and Type 3 press ON to review the time remaining until the control assig...

Page 38: ...value of a parameter by mistake pressing the parameter key again restores the original value Deleting Program Entries Follow the procedure outlined in the section Program Review As the value for each parameter you want to delete is displayed control assignments on and off times and dates or interval length cycle length day omission press CLEAR followed by ENTER To remove a program from memory enti...

Page 39: ...m with Day Omit 38 Program 4 Interval Program with Cycle Length 39 Program 5 On Off Program with Cycle Length 40 Program 6 On Off Program with Day based Cycle 40 Program 7 24 hour based Program 41 Program 8 Program Controlling Program 42 Program 9 Using Inputs 43 Program 10 Re trigger and Time Out 44 Program 11 School Bells 45 Program 12 Delay Program 45 ...

Page 40: ...onds so all circuits turn back on at once following a power failure Adjust the Sequence Start rate as follows 1 Press ENTER FUNCTION then 2 F 02 displays 2 Press ENTER The Sequence Start rate in seconds displays 3 Type in the value you want for Sequence Start in seconds up to 99 4 Press ENTER The function is set and the display shows Time of Day You may hit TIME to exit from this procedure at any ...

Page 41: ...n Off Interval with a 5 second Cycle Length Start and stop the program through the keyboard Set Program 1 1 Press ENTER ENTER P n displays where n is the number of the next available program 2 Press CIRCUIT then 3 C 03 displays 3 Press INTERVAL then 0 0000 displays 4 Press SECOND then 1 000001 displays 5 Press CYCLE 0 SECOND 5 000005 displays 6 Press ENTER to store the last entry then press TIME t...

Page 42: ...If you disable Program 4 PROGRAM 4 OFF you will observe that the switching stops When you enable the program once again PROGRAM 4 ON you will see the switching resume but not until the next whole minute is reached In other words the program has remained in step with the clock while it was disabled Sample Program 6 Program with a Day based Cycle Desired Effect To sample carbon monoxide emissions at...

Page 43: ... Saving Time A 24 hour based program is used so that the time between events is always 24 hours regardless of DST Plan Set Program 8 to turn on Circuit 1 every 24 hours beginning at 4 00 p m Depending on what day of the year the program is set its setting will shift to 3 00 p m or 5 00 p m at some point 1 Press ENTER then 8 E 08 displays 2 Press CIRCUIT then 1 C 01 displays 3 Press ON then 4 0 0 A...

Page 44: ... Program 1 1 Press ENTER then 1 E 01 displays 2 Press PROGRAM then 2 0 P 20 displays 3 Press ON A dash displays if no previous On time has been set for this program 4 Press 6 1 5 615 displays 5 Press DATE then 3 0 1 301 displays 6 Press OFF A dash displays if no previous OFF time has been set for this program 7 Press 1 2 0 0 1200 displays 8 Press DATE then 4 0 1 401 displays 9 Press ENTER to store...

Page 45: ...ys 4 Press PROGRAM 2 ON P 02 displays 5 Press ENTER to store the last entry then press TIME to return to the Time of Day display Set Input 2 1 Press ENTER INPUT 2 02 displays 2 Press PROGRAM 1 OFF P 01 displays 3 Press PROGRAM 2 OFF P 02 displays 4 Press CIRCUIT 1 OFF C 01 displays 5 Press CIRCUIT 2 OFF C 02 displays 6 Press ENTER then press TIME Set Program 1 1 Press ENTER then 1 E 01 displays 2 ...

Page 46: ...it 2 1 Press ENTER then 7 E 07 displays 2 Press CIRCUIT then 2 C 02 displays 3 Press OFF INTERVAL then 0 0000 displays 4 Press SECOND then 1 0 000010 displays 5 Press ENTER The display shows 1 07 indicating that Program 7 is a Type 1 Off only Interval Program 6 Press TIME to return to the Time of Day display Sample Program 11 School Bells Desired Effect To ring a bell at 7 a m 7 05 a m and various...

Page 47: ... seconds before turning Circuit 2 ON for 15 seconds Plan Program 1 is an On only Interval Program that turns on Program 2 after an interval of 45 seconds Program 2 turns ON Circuit 1 for 15 seconds Set Program 1 1 Press ENTER then 1 E 01 displays 2 Press PROGRAM then 2 P 02 displays 3 Press ON INTERVAL 0 SECOND 4 5 000045 displays 4 Press ENTER The display shows 3 01 indicating that Program 1 is a...

Page 48: ...h of time then OFF Key sequence ON OFF INTERVAL or INTERVAL alone Type 0 Interval is assumed then the duration Duration is the length of time ON before switching OFF Think of it as ON then OFF after an INTERVAL of n Type 1 OFF after a length of time regardless of current condition Key sequence OFF INTERVAL then the duration Duration is the length of time before switching OFF Think of it as OFF aft...

Page 49: ... the changeover hour A day begins at midnight 12 00 00 a m and ends just before midnight 11 59 59 p m Ordinarily this is 24 hours except when Daylight Saving Time begins and ends A 24 hour period on the other hand is exactly that 24 hours between occurrences of an event You may need to consider how Daylight Saving Time will influence both day based programs and 24 hour based programs whenever an e...

Page 50: ...ll also occur at 3 30 a m and each day thereafter 24 Hour Based Programs at the End of DST When Daylight Saving Time ends the event will go back to occurring when the clock reads 2 30 a m because the clock fell back one hour at 2 a m but there will always be 24 hours between occurrences How to set a Day Based Program A day based program is set by leaving out the hours and minutes in the Cycle Leng...

Page 51: ...limit set forth above be received at its Factory Service Center with transportation charges prepaid provided that ChronTrol Corporation s examination discloses to its satisfaction that such product is defective Any adjustment or replacement of defective parts made under this Warranty does not void the Warranty nor does it extend the original Warranty period This Warranty shall not extend to any Ch...

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