Green Indications; Yellow Indications; Red Indications - Lab.gruppen PLM Series Operation Manual

9 FRONT PANEL INTERFACE
Network/
Frame
1
Status
Module A
2
Input
Module B
3
Input
4
Not Used
Figure 9.10a: Front panel soft function buttons in fault/
warning mode
The relationship between LEDs and inputs
and outputs is maintained in MENU mode.
It is important to remember that the LEDs
often operate independently of the function
of the soft function 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 9.10b: Input clip LED and on-screen warning
Output clip
All output channels are monitored by a suite of
protection circuits that include a Current Peak
Limiter (CPL) and an Inter-Sample Voltage Peak
32 PLM Series Operation Manual
Limiter (ISVPL). See section 7.3 Amplifier and Load
Protection Systems for further information. If the CPL
protection device is active, or a voltage clip occurs,
Channel
5
Output 1
then the appropriate Channel Output LED will flash
red. In addition, a corresponding text warning will
Channel
6
Output 2
also be displayed on the screen.
Channel
7
Output 3
Channel
8
Output 4
Warning or fault indications
If certain parameters within the PLM approach or
exceed preset limits, a warning condition or fault
condition may arise. One or more LEDs will then
provide an appropriate visual indication. A textual
on-screen description of the condition will also be
displayed adjacent to the LED(s).
The LEDs can show three colors, each conveying a
different status.

9.10.2.1 Green indications

A green indication of LEDs 2, 3 and 5-8 confirm
that inputs or outputs are unmuted and operating
normally.

9.10.2.2 Yellow indications

Yellow LED indications are reserved for PLM
warnings. See Table 9.11a.
An 'Event Log' file logs these warnings (with date
and time stamps) within the PLM. See Chapter 5.3
of the DLC User Manual PLM Edition Addendum for
further information on accessing the Event Log.
A detailed description of each warning can be found
in table 11.1.

9.10.2.3 Red indications

Red LED indications are reserved for PLM faults.
See t
An 'Event Log' file records these faults (with date and
time stamp) within the PLM. See Chapter 5.3 of the
DLC User Manual PLM Edition Addendum for further
information on accessing the Event Log.
A detailed description of each warning can be found
in table 11-1.
Figure 9.10c: CPL Active
Figure 9.10d: Voltage Clip
able 9.11b.