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Disabling Occ-sensors Outside of Schedule on a DE (Ground 8) DigiLink

When programming a DigiLink that is controlled by an occ-sensor input and you want the occ-sensor to be disabled during the ON section of the schedule there are a few things that you must be aware of.

 

This looks like a simple programming solution but it is not quite as simple as you would think and can be accomplished by using ground 8 to control the occ-sensor. The trouble is that if one schedule controlling a group turns off and the other schedule controlling the same group through a DigiLink which is enabled by ground 8 turns on at the same time there is a conflict of control at the time of schedule change. There must be a small break between the time that the old schedule is turned off and the new schedule is turned on. This has been tested and can be as narrow a time gap as 2 seconds.

 

If Schedule #1 is the normal day schedule for the group and Schedule #2 is the schedule that controls the ground 8 enable/disable of the Digi-link and runs during the off time for schedule #1 and the ending time for schedule1 is set for the same time that schedule #2 is set to enable the Digi-link that has occ-sensors attached and if the occ-sensors are sensing the room is occupied then the lights will turn off with Sch#1, but they will not turn back on with Sch#2. The lights will not turn back on with the occ-sensors as long as the occ-sensors are sensing that the area is occupied, the occ-sensors need to time out before they will turn the lights on and this will not happen until the area is vacated.

 

 This problem can be corrected by setting a small gap between the time that the first schedule turns off and the second schedule turns on, this holds true for both ends of he schedule. Once you understand how to program this it is easy to implement. 

 

To program this transition

 

Create:

Schedule 1 – the normal working schedule to control the lights without occ-sensor control, say 8:00AM to 5:00PM every day and controls Group 1.

 

Group 1- This will need to be set as Maintain.

 

Schedule 2 will control the ground 8 and this must be set to enable ground 8 at 5:00:02 PM to 7:59:58AM which is 2 seconds after Schedule 1 is turned off and 2 seconds before Schedule 1 is turned on. This is the smallest amount of time one can have between the schedules for it to work properly.  The schedules can have more time between them.

 

Which ever input that the occ-sensor is connected to, say input 1, must be programmed to turn on Group 1.

 

How this works:

1)                  Schedule #1 turns off group 1

2)                  Two seconds later Group 1 is turned back on by the occ-sensor when the Digi-Link is enabled by Sch#2 – this will give a transition from schedule control to occ-sensor control with a 2 second blink.

3)                  At the other end of he schedule – Schedule #2 turns off group 1

4)                  2 seconds later Group 1 is turned back on by Schedule #1.

 

At either change of schedule, if the occ-sensors is already sensing occupation of the area then the lights will be on and the rollover of the schedules will have a 2 second blink. However, if the occ-sensors are not sensing occupation in the evening, the lights will turn off when schedule #1 turns off and the occ-sensors will be in control of the lights.

 

This works and has been tested at 2 seconds and might work at 1 second. The disadvantage of this programming is that there is a blink and would not work with HID lighting.digi2.JPG

 

To program this for HID lighting or to be a seamless transition from one schedule to the next and back again take the following steps.

 

Create:

Schedule 1 – the normal working schedule to control the lights without occ-sensor control, say 8:00AM to 5:00PM every day and controls Group 1.

 

Group 1- This will need to be set as a Maintain + Blink and the timer needs to be set for 10 seconds with a 5 second blink warning and the relay properties need to be set for all relays in this group to no blink.

 

Schedule 2 will control the ground 8 and this must be set to enable ground 8 at 5:00:02 PM to 7:59:58AM which is 2 seconds after Schedule 1 is turned off and 2 seconds before Schedule 1 is turned on.

 

Which ever input that the occ-sensor is connected to, say input 1, must be programmed to turn on Group 1.

 

How this works is that when Sch#1 turns off group 1 goes into blink mode for 5 seconds, two seconds later Group 1 is turned back on by the occ-sensor when the Digi-Link is enabled by Sch#2 this will give a transition from schedule control to occ-sensor control that is apparently seamless. The same will happen at the other end of he schedule except Sch#2 turns off group 1 goes into blink mode and then 2 seconds later Group 1 is turned back on by Sch#1. At either change of schedule if the occ-sensors are already sensing occupation of the area, then the lights will be on and the rollover of the schedules will be seamless, yet if the occ-sensors are not sensing occupation in the evening then the lights will turn off 5 seconds after the schedule turns off and the occ-sensors will be in control of the lights.

Digi-1.JPG

 

 

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