Australian Monitor KA1500 - Manual (Page 11)

3. Installation
Mains Lead Wiring
WARNING
Your amplifier must be earthed at all times!
When you first receive your amplifier it may not have
a mains plug attached. You must ensure that an
appropriate plug is used and corresponds with the
amplifier’s current (ampere) requirements and meets
the approval of your local energy authority.
Please refer termination of this lead to qualified
personnel. Australian Monitor takes no
responsibility for any damage or harm resulting
from improper termination of this lead!
The wires in the mains lead are colored in accordance
with the following code:
GREEN AND YELLOW = EARTH
Connect to the terminal marked with the letter E, with
the EARTH SYMBOL or colored GREEN.
BLUE = NEUTRAL
Connect to the terminal marked with the letter N (or
colored WHITE in USA and Canada, or colored
BLACK in the United Kingdom).
BROWN = ACTIVE (LIVE)
Connect to the terminal marked with the letter A or L
(or colored BLACK in USA and Canada or colored
RED in the United Kingdom).
Power Requirements
Mains Voltage Circuit Breaker Rating
100 to 120 volts 20 Amps
220 to 240 volts 10 Amps
Power Consumption at idle = 220 Watts
Consumption at rated 4 ohm power = 2400 Watts
Ensure that your mains voltage is the same as the
rear panel mains voltage marker (+/- 10%).
Mounting
Your amplifier is designed for standard 19" rack
mounting and occupies 2 EIA rack units (3.5"). The
mounting centers are:
Vertical: 3.0" (76.2mm)
Horizontal: 18.2" (461.2mm) to 18.7" (473.8mm).
The slots in the mounting flange will accept bolt
diameters up to 1/4" (6.35mm).
We recommend that you provide additional support
for the amplifier, especially if road use is planned, as
the weight can bend some racks otherwise. This
support can be provided by secure shelving, support
rails or a rear rack mounting strip to match up with the
rear rack mount ears provided on your amplifier.
Cooling
Each channel of your KA1500 amplifier is cooled by
twin axial fans which draw cool air from the front of
the unit and expels the heated air from the rear of the
unit. These units offer two speed fans which run at
half speed, switching to full speed when the internal
heatsink temperature exceeds 60
0 C (128 0 F).
An unrestricted airflow into and out from the unit must
be provided. Any restriction of the air flow will cause
heat to build up within the unit and possibly force the
unit into its thermal shutdown mode.
If the units are to be operated in an environment
where the airflow is restricted such as sealed racks or
even when running 2 ohm loads, the cooling should
be supplemented by extra cooling fans to evacuate
the heated air and aid the flow of cool air through the
unit.
Input Wiring
IMPORTANT! Do not directly connect pin 1 on the
amplifier’s input or strapping XLR, to the amplifier’s
chassis, speaker ground or power ground!
NOTE: Input signal ground is not to be used as
a safety ground (earth).
The input to your amplifier is a balanced 3-pin system
and requires all three pins to be connected. Only high
quality twin-core shielded cable should be used.
When wiring for a balanced source the connector
going to the input of your amplifier should be wired as
follows:
Pin 2 = HOT (In Phase - non inverting).
Pin 3 = COLD (Reverse Phase - inverting).
Pin 1 = GROUND / SHIELD.
When wiring from an unbalanced source you must
ensure that pin 3 is connected to pin 1 (input ground),
either by linking the pins in the input connector or by
the source equipment's output wiring.
When wiring for an unbalanced source:
Pin 2 = HOT (in phase with the amplifier’s output),
Pin 3 = GROUND/SHIELD (joins to pin 1).
Pin 1 = GROUND/SHIELD
Installation 11