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Configure Photocell Interaction with Relays
As mentioned earlier, each photocell can have up to
(16) trigger points and relays or groups of relays which
are activated at specified rising (on) and falling (off)
levels of the photocell. To configure these trigger
points:
Step 1: From the "Discrete Inputs" menu, select
"Assign Actions"
Step 2: Use the to select "Photocell
Levels", then
Step 3: Press the Select/Save
Step 4: Use the to select the number of the
photocell which you want to configure, then
Step 5: Press the Select/Save.
Step 6: Choose whether or not this photocell is
enabled, the default action is "YES".
Step 7: Select the photocell operation mode,
•Relinquish On/ Forced Off
•Forced On / Forced Off
•Forced On / Relinquish Off
Step 8: Set the Delay Time, valid range is 0-240 min.
Delay Time is used to prevent rapid changes to
lighting based on changing conditions in the
environment. For example, clouds passing the sun
which temporarily darkens the space. It’s expressed in
minutes and represents the length of contiguous time which the
trigger point must have been passed in order for the relays to be
turned on or off.
Step 9: Select the trigger point you wish to define, valid are 1-16, then press the
to advance to the next field.
Step 10: Enter the level, in FC, for which you desire these relays to be
deactivated when the light levels are RISING (ON). Then press the
. again to advance to the next field.
Step 11: Enter the level, in FC, for which you desire these relays to be activated
when the light levels are FALLING (OFF). Then press the .again to
advance to the next field.
Step 12: Press Select/Save to add relays and/or groups to trigger for this trigger
point.
This will advance you to a menu where you can select to ADD, EDIT, or
DELETE groups. Select the desired option:
Step 13: Use the to select RLY for relay or GRP for Group, then the
.button to advance to the next field
Step 14: Enter the range of relays you wish to assign to this trigger point, then
Step 15: Press Select/Save to save your changes.
Up to 32 relay/group entries can be programmed
Photocells
Photocells are devices
which sense the incident
light levels, and output a
voltage proportional to the
dynamic range which the
photocell has been pre-
configured to support. For
example, Leviton's ODC0P-
00W calibrated photocell
senses 0-70fc. When the
photocell receives 0fc of
incident light, the output
voltage will be 0V.
Likewise, when the
photocell receives 70fc of
incident light, the output
voltage will be +10VDC.
Your relay cabinet converts
this 0-10VDC input to a
"FC" level, scaling based on
the maximum FC level
input when you configure
the analog input for a
photocell.
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