D.A.S. PowerPro Serie Manual Del Usuario página 11

INTRODUCTION
General
Thank you for purchasing a D.A.S. power amplifier. It has
been built with the most advanced modular technology, and
has been designed through the use of computer-aided
design for both the electronic and mechanical parts.
Features
•
Class AB
•
Linear Switching Power
•
Dual balanced XLR inputs
•
Binding post and Speakon output connections (PS-800
and PS-1400 only)
• Variable speed back-to-front fan cooling
•
Front located volume controls
•
Input Sensitivity switchable between 0.775V, 1V and
1.44V.
•
Ground loop selector.
•
Stereo, parallel and mono operation modes
• Complete and independent protections on each
channel against output short-circuits, overloading and
overheating
•
The power supply is protected against short-circuits,
voltage and current overloading; triggering the latter to
the standby mode
•
Clip limiters
•
Clip, protection and idle LED indicators
FRONT PANEL DESCRIPTION
PS-200, PS-400
PS-800, PS-1400
A) POWER SWITCH
Turns the amplifier on ("|" position") , and turns the
amplifier off ("0" position).
B) POWER LED
When these green LEDs illuminate, it indicates that
both amplifier channels are ready.
Serie PowerPro/ PowerPro series
Level A
Clip
ELECTRONICS
Protection
Signal
On
D F
G C B
PS-800
®
ELECTRONICS
Clip
Protection
Signal
On
Level A
G D C F B
Manual del usuario / User's manual
C) INPUT LEVEL CONTROLS
Volume levels for each channel can be adjusted by using
the knobs found on the front panel. Gain is maximum when
the LEVEL rotary potentiometer is rotated fully clockwise.
D) CLIP LED
In the event that the signal's excursion exceeds the
maximum voltage from the power supply, the unit will
indicate saturation through the clip LED of the channel
involved. An automatic limiting system will impede
prolonged saturation.
E) PROTECTION LED
When a channel's output is disconnected by the amplifier's
protection, this yellow LED is on.
A channel's protection may be triggered by:
•
Overheating sensed at any part of a channel. When the
amplifier has cooled down, the channel's output will
be connected and operation will resume. The control
circuit has some degree of built-in hysterisis to avoid
turn-on and off oscillations.
•
Presence of DC at a channel's output. Since it may
severely damage speakers, the amplifier will
deactivate the output in the event that DC levels are
too high. Once DC is no longer present, the
PROTECTION LED will turn off and output is
reactivated.
PS-400
Clip
Level B
Protection
Signal
On
PowerPro Series
A E
Clip
Protection
Signal
On On
Level B
PowerPro Series
A E
• Short-circuit at a channel's output (only PS-200 and
PS-400) or load impedance is too low this protection
is activated. In this case, once the short circuit is
gone the output is NOT reactivated; the amplifier
needs to be switched off and on to reactivate.
•
When the amplifier is switched on, the output is also
deactivated for a few seconds to prevent dangerous
transients from damaging the speakers, and the
PROTECTION LED is on until the amplifier is ready for
use.
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