Operation Manual

5. Operation and performance
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PLM+ SERIES Operation Manual rev 3.0.2
5.3.12. Power supply protection
The power supply is very advanced and has several internal control and monitoring functions. Should any of these
fail, the power supply will shut down to prevent damage or limit severity of the failure. Power supply faults, or
power supply needs service faults, are indicated by flashing red on the frame LEDs and a corresponding text
description on the front panel, in Lake Controller and CAFÉ software programs. Refer to section 9.1 for more
information on warnings and faults.
In the extreme event of simultaneous low mains voltage supply and high power demand, the amount of incoming
supply will then be forced to shut down. This
condition is a power protect fault, indicated with a red LED and associated error messages registered in Lake
Controller and CAFÉ software programs.
5.3.13. Mains anomaly protection
AC mains service.
Over–voltage – If the power supply detects mains voltage above 400 V peak or 270 V RMS, it will enter protective
Under–voltage – If the power supply detects mains voltage of less than 65 V, it will enter protective shut down
Mains instability – If the power supply detects protracted instability in the AC mains, it will enter protective shut
Mains glitch – If the power supply detects a momentary mains glitch (missing cycles) at the AC inlet, a warning
indication will be reported with flashing yellow on the frame LEDs and a corresponding text description on the
front panel, in Lake Controller and CAFÉ software programs. The powers supply and product continue operation
throughout a mains glitch.
5.4. Power Supply
The R.SMPS (Regulated Switch Mode Power Supply) is designed to keep supply voltage rails at optimum levels.
Thus the R.SMPS can deliver full rail voltage to the output sta
consistent transient response and a clean LF response.
The PLM+ features a universal power supply with power factor correction (PFC). The device can accept any mains
current peaks on the lines and reduces the requirements placed on the mains distribution system. PLM+ units offer
an unparalleled power factor extremely close to one.
shut down mode. The amplifier will auto-restart if the condition clears. Will be indicated by flashing red on the frame
LEDs and a corresponding text description on the front panel, in Lake Controller and CAFÉ software programs.
Refer to section 9.1 for more information on warnings and faults.
mode. The amplifier will auto-restart if the condition clears. Will be indicated by flashing red on the frame LEDs
and a corresponding text description on the front panel, in Lake Controller and CAFÉ software programs.
Refer to section 9.1 for more information on warnings and faults.
down mode. The amplifier will auto-restart if the condition clears. Will be indicated by flashing red on the frame LEDs
and a corresponding text description on the front panel, in Lake Controller and CAFÉ software programs.
Refer to section 9.1 for more information on warnings and faults.
Power protect – In the extreme event of simultaneous low mains voltage supply and high power demand, the
amount of incoming energy may not be sufficient for continued operation. The power supply will then be forced to
shut down. This condition is a power protect fault, indicated with flashing red on the frame LEDs and a corresponding
text description on the front panel, in Lake Controller and CAFÉ software programs. Refer to section 9.1 for more
information on warnings and faults.
5. Operation and performance
PLM+ SERIES Operation Manual rev 3.0.4
25
5.4.1. Low Inrush Current
High power ampliers with inadequate inrush current limiting can draw considerable current from the mains at
turn–on, sometimes tripping a fast–acting mains breaker. The PLM+, however, has very low inrush current to
prevent tripping of breakers. Several units can, under normal conditions, be powered up simultaneously. If you
do experience problems powering up multiple units simultaneously, they must either be turned on manually in an
ordered manner, or sequenced remotely using the Lake Controller software’s Global Control feature. Alternatively,
the capacity of the mains supply should be increased.
NOTE: If insufcient power is available to allow simultaneous power–up, then there is probably
insufcient capacity for full power output during operation. It is recommended that additional capacity is
added to the mains power distribution system.
5.5. LoadPilot Load Monitoring
5.5.1. Introduction
LoadPilot is a feature in PLM+ ampliers that can continually monitor the integrity of loudspeakers and cables
connected to the outputs to ensure that they are functioning properly and free from major anomalies or faults.
By implementing LoadPilot, systems incorporating PLM+ ampliers can be certied in compliance with voice
evacuation standards such as EN54–16 and NFPA72.
LoadPilot functions by automatically superimposing low–level pilot tones on the input signal (if any present) to the
amplier. One tone is below the range of human hearing (approximately 10–20 Hz) and the other above (24 kHz),
so the activity of LoadPilot is inaudible regardless of whether the system is currently reproducing program content.
High–resolution current sensing on the outputs can calculate the impedance of the load at the frequency of the
tones. Hence a stable measurement of the impedance of the load can be obtained and potential anomalies or
faults can be detected that would indicate impaired loudspeaker function or total inoperability due to failure of the
loudspeaker or faults in connected wiring. The superimposition of pilot tones and analysis is interleaved across the
amplier’s output channels with a maximum total cycle time of around 20 seconds.
LoadPilot is implemented and congured in the CAFÉ software. Monitoring status and fault indication are displayed
on the front panel and both in CAFÉ and Lake Controller.
LoadPilot may be congured with the automatic calibration or through a manual advanced mode, depending on
monitoring requirements and characteristics of the connected loudspeaker loads.
5.5.2. Automatic calibration
5.5.2.1 Functional description
Automatic calibration is suitable for the following applications and requirements for error detection:
• If one or two low–impedance loudspeakers are connected; if two in parallel is default, it will warn if one is
missing.
5. Operation and performance
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PLM+ SERIES Operation Manual rev 3.0.4