Outline GTA OTTO User Manual Download Page 14

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Installation

3 : 1.Location

The intended use of GTA series amplifiers is in a rack

only. The AC mains wirings of the units must be connected
to a terminal box provided with a properly breaker (refer
to

§3 : 4.AC Mains supply

for more details). It is not allowed

to connect the GTA series AC mains connection directly to
the power distribution system. For North America market
we recommend to use an approved UL/CSA cable (i.e. ST
600Vac 105°C 5x13AWG).

In order to limit the risk of mechanical damages, the

amplifiers must be fixed to the rack using both frontal and
rear mounting brackets. We recommend to use eight M6 or
12-24 UNC-2B screws for threaded holes or cage nuts.

Install this amplifier as far as possible from radio tuners

and TV sets. An amplifier installed in close proximity of such
equipment may experience noise or generic performance
degradation. Placing and using the amplifier for long periods
of time on heat generating sources will affect its performance.
Avoid placing the amplifier on heat generating sources.

This device must be powered exclusively by

earth connected mains sockets in electrical

networks compliant to the IEC 364 or similar rules.

Since the main power switch on this unit does not provide

a complete insulation of the equipment from the main power,
you must disconnect the main power source to turn off all
power.

3 : 2.Cooling

Install the amplifier in a well-ventilated location: the

ventilation openings must not be impeded by any item such
as newspapers, tablecloths, curtains, etc; keep a distance of
at least 50 cm from the front and rear ventilation openings
of the amplifier.

All Outline amplifiers implement a forced-air cooling

system to maintain low and constant operating tempera-
tures. Drawn by the internal fans, air enters from the front
panel and is forced over all components, exiting at the back
of the amplifier.

The amplifier’s cooling system features “intelligent”

variable-speed DC fans which are controlled by the heatsink
temperature sensing circuits: the fans speed will increase
only when the temperature detected 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.

GTA 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
(see

Panel G, p. 6

3 : 3.Cleaning

Always use a dry cloth for cleaning the chassis and the

front panel. Air filter cleaning should be scheduled according
to the dust levels in the amplifier’s operating environment.

Disconnect the AC mains source before

attempting to clean any part of the amplifier

In order to clean the vent filters you need to remove the

front cover: never attempt to open any other part of the unit.

By means of a metric hex key #6, unscrew the two screws

located on the left and right sides of the front panel, (see

FIG.

) gently lift the cover and remove the filter. You may use

compressed air to remove the dust from filters, or wash it
with clean water: in the latter case ensure that the filter is
dry before reassembly.

3 : 4.AC mains supply

GTA series amplifiers offer worldwide AC acceptance and

direct connection to any regional power line configuration.
The power supply is now suitable to single-phase, two-phase
or three-phase operation from 90 V

up to 464 V

without

need of manual selection: true three-phase load balancing
is directly achievable by the unit without any complex load
assignment in the power distribution system design.

AC mains connection is provided by means of the eu-

roblock Phoenix PC 5/5-STF1-7,62 flying plug (Phoenix prod-
uct ID 1777862). Proper assembly of the AC mains conductors
to the flying plug must respect the power line configuration.

Take care to connect any and all the five contacts of the

flying plug to the power cords according to the configuration
showed in

Panel K, L, M

p. 9

and

p. 10

. In order to

guarantee the proper connection we recommend to use an
approved UL/CSA cable (i.e. ST 600Vac 105°C 5x13AWG).

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