Mounting; Cooling; Operating Precautions; Grounding - powersoft M30D HDSP+ETH User Manual

7.2 Mounting

All Powersoft amplifiers are designed for standard 19" rack
mounting with four front panel holes and two rear-lateral holes. In
order to limit the risk of mechanical damages, amplifiers must be
fixed to the rack using both frontal as well as rear mounting holes
(see FIGURE 9).
air flow
mounting
holes
FIGURE 9: M Series air flow.

7.3 Cooling

All Powersoft amplifiers implement a forced-air cooling system
to maintain low and constant operating temperatures. Drawn by
an internal fan, air enters through the slots in the front panel and
is forced over all components, exiting at the back of the amplifier.
The amplifier's cooling system features an "intelligent" variable-
speed DC fan which is controlled by heat sink temperature sensing
circuits: the fan speed will increase only when the temperature
recorded by the sensors rises over carefully predetermined values.
This ensures that fan noise and internal dust accumulation are kept
to a strict minimum. Should however the amplifier be subject to
an extreme thermal load, the fan will force a very large volume
of air through the heat sink. In the extremely rare event that the
amplifier should dangerously overheat, sensing circuits shut down
all channels until the amplifier cools down to a safe operating
temperature. Normal operation is resumed automatically without
the need for user intervention.
Caution regarding heat escape should be exercised when
mounting M Series amplifiers. Exhaust cooling air is forced out
through the rear of the chassis (see FIGURE 9); make sure there
is enough space around the back of the amplifier for this air to
escape. M Series amplifiers can be stacked one on top of the other
due to the efficient cooling system they are equipped with. There
is however a safety limit to be observed: in case a rack with closed
back panels is used, leave one rack unit empty every four installed
amplifiers to guarantee adequate air flow.

7.4 Operating precautions

Make sure the power switch is off before attempting to make
any input or output connections.
Make sure the AC mains voltage used is within the acceptable
operating voltage range specified in the M Series documentation
(factory selected 115 V / 230 V ±15%), depending on your country
10
brackets
mains standard. Damage caused by connecting the amplifier to an
improper AC mains voltage is not covered by the warranty.
By using good quality input and speaker cables, the likelihood
of erratic signal behavior is reduced to a minimum. Whether you
make them or buy them, look for good quality wires, connectors
and soldering techniques.

7.5 Grounding

There is no ground switch or terminal on the M Series amplifiers.
All shield terminals of input connections are directly connected to
the chassis. This means that the unit's signal grounding system is
automatic. In order to limit hum and/or interference entering the
signal path, use balanced input connections.
In the interests of safety, the unit MUST always operate with
electrical safety earth connected to the chassis via the dedicated
wire in the 3-wire cable. Never disconnect the ground pin on the
AC mains power cord.

7.6 AC mains connection

The AC Mains connection is made via the IEC type connector
on the back of the amplifier. Please make sure your AC mains
power source operates within the voltage limits indicated on this
manual (factory selected 115 V / 230 V ±15%).
Safety warning!
Ground wires must be connected!
Do not use adapters that disable grounding.
open the lock and
insert the plug
FIGURE 10: AC mains plug connection.

8 Connections and Operation

This section provides information on amplifier connection and
operation. For optimal amplifier performance, it is important to
understand the meaning of the information that each M Series
amplifier can provide regarding its status and configuration. This
information is available to the user via front panel indicators as well
as through specific LEDs the back of the unit (for HDSP versions
only). This chapter will break down all the front panel and back
panel functions. The remaining part of the chapter will explain
how to correctly connect the amplifier's inputs and outputs.

8.1 Front panel air filters access

The blue front panel of all M Series amplifiers can be removed
to access the air filters. This is useful when the air filters need to
be cleaned due to dust accumulating and clogging the filters thus
hindering proper air circulation vital for cooling purposes.
lock the plug