RTxxx LED lighting controllers - User Manual
Display
error
Comms
error
number
Reason
E1
Err 21
Current output is too low. This may
be because the light has become
disconnected.
E2
Err 22
The lighting required more than
the maximum available current for
the voltage rating.
E3
Err 23
Current output is not what was
expected. The controller might
need calibrating.
E6
Err 23
The power rating of the light
exceeds the maximum power
rating.
7.5
Light characterisation
You can reduce the time it takes for your RTxxx to reach high accuracy
in time-critical machine vision systems when changing from one
overdrive brightness setting to another. This can be done by
instructing the controller to make current and voltage measurements
up to a customer specified brightness limit when the light is
characterised. This is called the characterisation limit. The measured
overdrive voltage and current relationship is stored in the RTxxx and
allows it to respond much more rapidly to new overdrive parameters
up to that limit.
When a light is detected, the characteristics of the light are measured
up to the brightness set for the characterisation limit. It is not
essential to set this value and it can be left at 200 (meaning 200%
brightness). The feature can also be turned off by setting this
value to 0.
You can change the characterisation limit brightness through the
RTxxx's webpages (see
Section 11, Webpage configuration (RT220,
) or by command (see
).
7.6
Current adjust
The current adjust feature provides a more accurate and repeatable
output current. After setting an output current, the controller
continually measures the actual current and adjusts the output to
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