RTxxx LED lighting controllers - User Manual
The duty cycle is limited by ignoring triggers which are too soon after
the previous trigger.
For example, if the brightness is set to 250%, then the RTxxx does not
allow pulses greater than 10ms long. With 10ms pulses, if a trigger
occurs within 50ms of a previous trigger (so that the duty cycle would
be greater than 20%) the trigger is ignored.
7.3
Fault detection
The RTxxx controller detects the following errors. The error code is
shown on the webpage of an Ethernet controller (see
Webpage configuration (RT220, RT420, RT820F)
),or the communications
window of an RS232 controller (see
). When the output current is less than 100mA, some
fault detection is disabled.
You can issue a
GR
command to cancel the error (see
). The RTxxx controller re-senses the light.
Error
Reason
34, 37
Internal power dissipation is too high. Output turned
off.
35, 43
Output current to lighting is too low. The light is open
circuit or there is not enough supply voltage for the
requested output current.
36
If the output voltage is too low, the controller detects
that the output is short circuited.
37
The voltage required for the lighting has increased too
much. Check for ageing of the lighting or a failed LED.
38
The voltage required for the lighting has decreased
too much. Check for ageing of the lighting or a failed
LED.
7.4
Light auto-sensing
When a channel does not have a light connected, the RTxxx continually
tries to supply a very small current.
When a light is connected, it flashes for a short time (the light is not
damaged by this) until the RTxxx detects that it is connected.
For voltage rated lights, the light is briefly driven at an increasing
amount until 100% output brightness is achieved in order to sense the
current rating of the light. This can generate the following errors:
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