Echelon Lumewave CPD 3000 Lighting Controller - Manual (Page 17)

CPD 3000 Integration Guide 17
lower limit of the PWM output with the
nviLampValue
is at 0.5%. Limit to 0-
255. (Default value – 0). Use this to limit
the low level light setting to maintain
efficient operation.
maxPWM unsigned long
It may be necessary to set the highest 0-
10V signal to a value that can be used to
drive the controlled fixture. This value
upper limit of the PWM output with the
nviLampValue is at 100%. Limit to 0-
255. (Default value – 255)
pwmClock unsigned short
Allows programming of the PWM clock.
The values (0-7) are valid values as
defined in Neuron C. The default value
of 6 should be used.
alarmClrMode FlagManamentMode
Not supported. Controls how the alarm
flags are cleared by the LC. (FL_DAILY is
only supported)
clrTime unsigned short
Depending on alarmClrMode, this number
is used to manage automatic clearing of
fault flags. See the section on LC Alarms.
This value is scaled with a 6 minute
resolution. It should be set to allow
for alarm logs to be sent on schedule,
well after sunrise has occurred.
Default = 300
Analog Control
Dimming drivers and ballast controllers will exhibit different end results with
respect to power usage and light output response when subjected to a linear
control signal. An LED fixture with a particular Phillips driver was specified to
operate over the range of 0-10VDC. When tested for power efficiency and visible
light level response, the result was 2-8.6VDC. The fields minPWM and maxPWM are
used to control how nviLampValue.value translates to a control signal that
drives the controlled driver/ballast. The values are determined by experimenting
with an actual controlled fixture. In one particular application, the minPWM value
may be established by monitoring the reported power factor, or the measured
delivered light level of the installed fixture. For example, at 1.5V control signal,
the power factor may be adequate at .82, but the delivered light level is not
adequate until 2.5V. Measuring the control signal while driving a specific driver
is required to determine at what minPWM value, 2.5V is measured. The value for
maxPWM
may be determined by observing the measured power or the delivered lux
level to the pavement using a lux sensor. You may find the last volt of control
signal has no effect on the delivered light or power level measured for the load so
you could choose a value for maxPWM at around 240.