User manual

(5.0E) 2-5
OFF
ON
REM
PWR
TEMP
REM
PROT
LOCK
AB
P1200A front panel
2.7. Controls & indicators
PWR - Power (green)
− Lights continuously when the mainframe is switched on
and ready for use.
− Off . The mainframe is not powered from the mains supply, the
mains overvoltage protection has triggered (see 2.3.) or the
mainframe is not switched on.
− Flashes during the initial power-up cycle for about 2 seconds
and also when the mains overvoltage protection circuit is
triggered by an external fault (see also PROT below).
TEMP - Temperature (red)
− Flashes . The mainframe has switched off because the
maximum permissible operating temperature of the power
amplifier heatsink (83
° C / 180 ° F) or the mains power
transformer (120
° C / 250 ° F) has been exceeded.
PROT - Protect (red)
As the two mainframe power amplifier channels operate
independently there are two separate PROT indicators.
− On and PWR LED is on . An internal fault has been
detected on the mainframe channel concerned (e.g. DC voltage
fault in the output stage).
− On and PWR LED flashes . The respective power amplifier
has switched off due to an external fault like a short circuited
loudspeaker cable or too low a load impedance overloading its
output. Once the cause of the fault has been identified and
removed either muting and unmuting the controller module or
powering the mainframe off and on again will reset the
protection circuit.
REM - Remote (green)
− On . Communication to the RIB.
LOCK (yellow)
− On . The mainframe has been placed in a locked condition by
the remote control system. This means that all the mainframe
and controller module controls with the exception of the mains
switch are inactive (locked out).
− Off . The P1200A mainframe is set to local operation, i.e. may
be operated using the front panel controls.
OFF/REM/ON (mains power switch)
− OFF . With the exception of the mains overvoltage protection
circuit, the mainframe is isolated from the mains supply.
− REM . The mainframe is set to remote operation. If no remote
control system is connected this setting is equivalent to OFF.
− ON . The mainframe is switched on. In this switch position, the
remote control system can monitor and display the operational
status of the mainframe but cannot change any settings.