Led Faults, Warnings And Clip Indications - Lab.gruppen PLM Series Operation Manual

9 FRONT PANEL INTERFACE
These mutes are located within the PLM's power
output stage.
When the selected output is muted, the soft button's
integral LED turns red and the text AMP-CH MUTE
is displayed in inverse video. When unmuted, the
integral LED turns green (unless any other output
warning conditions are active).
If an output fault condition arises the LEDs
will indicate this status and not the output
mute condition, thus remaining red if the
output is already muted. However, a textual
description of the fault is provided on the display.
The output mute status can still be viewed via the
MENU system or the DLC PLM Edition software.
9.10.2 LED Faults, Warnings and Clip
indications
A tricolor LED is integral within each of the eight soft
buttons. These convey a variety of status indications:
including faults and warnings; signal clip indications;
and PLM Module Input, Module Output and Power
Output mute statuses.
LED Color
Green
Yellow
Red
Flashing Red
Table 9-1
The above list only applies to warnings, fault
and clip indications, not mute statuses.
An unlit output LED indicates that the output
channel is not routed to a Module output.
Under normal operating conditions (i.e. in METER
mode, with no fault conditions), seven of the LEDs
provide indication of PLM/Frame network connectivity
to the DLC PLM Edition software, plus mute status
indication for the two Module inputs (A and B) and
the four output channels (1 thru 4). The eighth button
is currently unused.
32 PLM Series Operation Manual
status
status Good
Warning
Fault
Clip
The positions of the LEDs logically follow the signal
flow, with Module inputs located on the left of the
screen and outputs on the right. See section 9.10.1
Mute Functions for further information concerning
Mute operation.
Network/
1
Frame
Status
Module A
2
Input
Module B
3
Input
4
Not Used
Figure 9-7
The relationship between LEDs and inputs
and outputs is maintained in MENU mode.
It is important to appreciate that the LEDs
often operate independently of the function
of the soft buttons.
Clip Indication
The front panel LEDs also indicate input and output
clip or pre-clip conditions that can occur within the
PLM.
Input Clip
Input clipping is monitored at two positions in the
signal chain:
▸ The analog input stage*; if the input signal
exceeds either +12 dBu or +26 dBu (according
to analog sensitivity setting), a clip indication
will be given. Does not apply if digital or Dante
inputs selected.
▸ Dolby Lake processor Module inputs: if the
signal level at this point exceeds +25 dBu, a clip
indication will be given.
The clip indication is given by the associated Module
LED flashing red. In addition, the warning INPUT
CLIP is displayed on the screen. If a second clip
within 400mS is detected, the LED will remain on
for a longer period.
Figure 9-8: Input clip LED and on-screen warning
Channel
5
Output 1
Channel
6
Output 2
Channel
7
Output 3
Channel
8
Output 4