powersoft K10 DSP+AESOP User Manual

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42
K Series User Guide
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CH1 READY
V I MUTED
FIGURE 81: Example of a muted right channel. To unmute the
channel, press the right most “mute” button again
14 Protection
In order to protect your device and your speakers from accidental
damage, K Series ampliers include an extensive automatic
protection system. In the following sections, potentially dangerous
scenarios and the ampliers’ corresponding protective response
are explained in detail.
14.1 Turn-On/Turn-Off muting
For about four seconds after turn-on, and immediately at turn-off,
the amplier outputs are muted. Class D ampliers may cause
severe speaker damage at power up due to the high voltage levels
at the output stage. In order to avoid this, the outputs are muted
for about 4 seconds after turn on. Similarly, turning off the amplier
can cause the same problem: outputs are muted immediately at
turn off.
14.2 Short circuit protection
Short circuits or very low impedance loads may destroy the
output stage of any amplier. In order to protect the amplier
from the dangerously high current surges arising from accidental
output short circuits or low impedance loads, all K series amps
block channel activity when the current drawn from the load rises
above a set value. In case of short circuit, the topmost front panel
red LED will light-up. At the same time, the “PROT” warning
appears in the rst line of the LCD display. The channel is muted
for 2 seconds after which the amplier will check whether the
current draw is still over the safety threshold. Should this be the
case, the amplier will mute the channel for another 2 seconds
and the procedure will reiterate. The amplier will therefore
automatically self-reset the channel every 2 seconds. Once the
amplier channel has undergone 50 resets and the output current
draw is still above safe limits, the channel enters a permanent
protection mode: an on/off cycle is needed to restart the unit and
restore it to full functioning mode. The red LED will be turned off
and the amplier will return to normal operating conditions only
when the output current draw returns to acceptable levels.
14.3 Thermal protection
All K Series ampliers use a continuously variable speed fan to
assist cooling (the fan speed changes in response to the amplier’s
cooling needs). If the heat sink temperature reaches approximately
80°C, the yellow front panel LED starts blinking. If the temperature
should rise above 85°C the thermal sensing circuitry will mute each
power section channels, the yellow LED will be steadily on, and
the power supply will be cut off. At the same time, the “PROT”
warning appears in the rst line of the LCD display. Once the
heatsink has cooled down, the amplier will automatically reset
and the yellow LED will go off. One possible way to reduce the
temperature is to reduce the output power.
14.4 DC fault protection
In order to protect your speakers from mechanical damage caused
by a DC signal coming from the amplier’s output, a DC detection
circuit is placed between the amplier’s output stage and power
supply. If a DC signal or excessive subsonic energy appears at a
channel output an instantaneous protection circuit will cut off the
power supply to both channels. Power supply shutdown is used
instead of speaker relays in order to improve the damping factor
and reliability of K Series ampliers. At the same time, the “PROT”
warning appears in the rst line of the LCD display.
14.5 Input/Output protection
An ultrasonic network decouples radio frequencies from the
outputs keeping the amplier stable with reactive loads and
protects the loudspeakers against strong very high frequency non-
musical signals above the audible range.
15 User Maintenance
15.1 Cleaning
Before attempting to clean any part of the amplier, rst disconnect
the AC main source. Use a soft cloth and mild nonabrasive
solution to clean the faceplate and chassis. WARNING! Never let
any liquid reach the internal parts of the amplier.
15.2 Service
There are no user-serviceable parts in your amplier. Refer
servicing to qualied technical personnel. In addition to having an
in-house service department, Powersoft supports a network of
authorized service centers. If your amplier needs repair contact
your Powersoft dealer (or distributor). You can also contact the
Powersoft Technical Service department to obtain the location of
the nearest authorized service center.
15.3 Dust Removal
In dusty environments, the front side air lters clog with dust after
prolonged use. The dust gathered in the lters will interfere with
cooling. You may use compressed air to remove the dust from
lters. To remove air lters:
1. rst unscrew the 2 M2 5X8 screws at the sides of the frontal
panel
2. rotate the covering grill

powersoft K10 DSP+AESOP Specifications

General

Brand	powersoft
Model	K10 DSP+AESOP
Category	Amplifier
Language	English