PLM Series Operation Manual rev 1.1.3
9. Front Panel Interface
45
9.10.1.4 Power Output Mute
The four soft function buttons (5-8) located on the right hand of the screen control the Power Output Mutes
of output channels 1-4 respectively.
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).
9.10.2 LED faults, warnings, and clip indications
A tricolor LED is embedded inside each of the eight soft function buttons. These convey a variety of status
indications: faults and warnings; signal clip indications; and PLM Module Input, Module Output and Power
Output mute status.
LED Color
Status
Green
Status Good
Yellow
Warning
Red
Fault or Mute
Flashing Red
Clip
Table 9.10.2: LED fault and warning indications
The above list only applies to warnings, fault
and clip indications, not mute statuse.
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 Lake Controller 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.
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.
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 Lake Controller software.
