R
2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
7
AI1 AMBIENT LIGHT INPUT
If using an ambient light sensor (0 to 5 or 1 to 5V); set
the low and high scaling limits for AI2. These limits are
what the light sensor reads at low limit and what the light
sensor reads at full scale.
A Lighting Channel Threshold and Hysteresis for each
of the available channels can be set for this input signal.
The Channel Power Threshold is basically a setpoint for
which AI1 is compared to determined when to turn off
the selected cycle(s). The Channel Power Hysteresis is
a buffer value which is prevents the channel from cycling
off/on prematurely. For example, if the input is scaled
0 to 1000 lumens and you want to turn off one channel
if the input gets up to 500 lumens and allow it to come
back on if the input falls to 400 lumens, enter in 0 for the
scaling low limit, 1000 for the scaling high limit, 500 for
the threshold and 10% for the hysteresis for that chan-
nel.
Select a threshold and hysteresis for the channels which
will be allowed to be shut off based on this input hitting
the threshold. A common application for this feature is to
control parking and exterior signage lighting. Essentially
the channel will be on all the time it is occupied except
when there is too much light. (Similar to the astronomical
time function).
If AI1 is not used, the threshold for all
channels MUST equal the scaling high limit.
AI2 ENERGY / POWER / MONITORING INPUT
If using an energy meter, power meter or current trans-
ducer (0-5V), set the low and high scaling limits for
AI2. These limits are what the energy or power meter
reads at 0V and what the energy or power meter reads
at 5V. For a 4 to 20mA input to be wired to AI2, a 250
Ω resistor must be installed between AI2 and GND. If
you want to use this input with a threshold and hyster-
esis (Channel Power section) to shut off lighting chan-
nels, select the relevant lighting channels (Enable AI2
Threshold checkboxes) and enter a threshold and a
hysteresis to be used.
If AI1 is not used, the channel
power threshold MUST equal the scaling high limit.
Select whether you want the time clock output (Digital
Output Mode) to be Normally Open or Normally Closed
during on periods.
The Channel Power Threshold is basically a setpoint to
which AI2 is compared to determine when to turn off the
selected channel(s). The Channel Power Hysteresis is a
buffer value which prevents the channel from cycling off/
on prematurely. For example, if the AI2 input is scaled 0
to 10000 KW and you want to turn off some channels if
the input gets to 7500 KW and allow them to come back
on if the input falls to 6500 KW, enter in 0 for the scaling
low limit, 10000 for the scaling high limit, 7500 for the
threshold and 10% for the hysteresis. You should choose
this threshold to be larger than the accuracy/error specifi-
cation of the equipment/device being turned off so it does
not cycle on and off.
AI2 AMBIENT LIGHT INPUT
If AI2 is not used for power limiting, a second light sen-
sor can be used to monitor another area. Set the low
and high limits for AI2. These limits are the light sensor
reading at 0Vand the sensor reading at 5V respectively.
Click on the Enable box for each of the channels to be
controlled by AI2 (in the Enable AI2 as Light Level Source
column). Then proceed to enter threshold and hyster-
esis values for each channel (located just below the AI1
AMBIENT LIGHT INPUT section). Each channel that is
selected/checked (Enable AI2 as Light Level Source)
will then have its threshold/hysteresis compared to AI2
instead of AI1
CHANNEL MONITORING AND CONTROL
DI1 and Override 1 are used for Channel 1, DI2 and
Override 2 are used for Channel 2, etc.
There are four Digital Input Modes which can be used
with a digital input: Regular, External Override, Momen-
tary Override, & Monitor.
Regular mode:
The digital input is used in conjunction
with the programmed schedule in determining when the
relay output should be on or off.
External Override mode:
The digital input acts the same
as the override button on the front of the QWL 3.1 Rev 2
Series panel. The switch used for this type of digital input
must be a momentary N.O. switch.
Momentary Override:
The digital input acts like a toggle
switch. This must also be a momentary N.O. switch. If the
time clock is on, pressing the switch turns it off, If the time
clock is off, pressing the switch turns it on.
