Power Dynamics PDV Serie Manual De Instrucciones página 3

ERIES 900 952.966 952.969 952.972 952.975
INTRODUCTION
The POWER DYNAMICS PDV series of amplifiers are designed for industrial use in factories, offices and
public buildings. Three microphone inputs are provided. In addition a LINE input is also available which can be
used for music sources and similar higher signal sources. There is also an output suitable for feeding the
POWER DYNAMICS slave amplifier in the same series thus making amplifier stacking a possibility. Provision is
made for connecting to either 100 volts to line or low impedance loudspeakers. The amplifier can be used from
either a 220-volt AC or a DC power source. Within the packaging will be found a 3 core 230V mains lead
terminated with a IEC connector at one end.
WARNING: DO NOT CONNECT THE MAINS SUPPLY TO THE AMPLIFIER UNTIL ALL THE
NECESSARYINPUT AND OUTPUT CONNECTIONS HAVE BEEN MADE.
NOTE: If you are connecting the amplifier to two-wire power source i.e. have no earth pin available then
essential that a suitable wire is run from the chassis binding post adjacent to the mains lead on the rear to a
proven earth.
PANEL DISCRIPTION
FRONT PANEL viewed from right to left. See the front page for a diagram. Three controlled channels are
provided. MIC 1 and MIC 2 are on the right with the LINE, BASS and TREBLE cut controls towards the left
hand side. The MASTER control is next with the signal monitoring and the mains on/off switch at the extreme
right.
REAR PANEL viewed from left to right. See the front page for a diagram. On the left is found the IEC input
incorporating a mains fuse. Next is the chassis binding post with the DC input terminals adjacent to the
loudspeaker termination. Towards the right there is the SLAVE OUT RCA socket which can be used for
recording purposes. Next are the LINE OUT and LINE IN sockets followed by the socket for MIC. See the
specification panel for full technical details.
PROTECTION
The amplifier is automatically protected for short, open circuit and overheating. A short or open circuit on the
loudspeaker line is indicated by the POWER indicator pulsing slowly on and off. Overheating in excess of
105°C is protected by a thermal cut out and if this occurs then the amplifier will cut out completely. The cause
is usually by the placing of papers on top of the amplifier or by enclosing it in a poorly ventilated place. If this
happens remove any restrictions on ventilation and leave the amplifier switched off for five minutes. This will
restore the protection circuits to their monitoring mode. If the fault had existed for some time then the fuse
located adjacent to the IEC connector on the rear panel may also need replacement. In this case the POWER
indication on the front panel will fail to illuminate.
INSTALLATION
MIC is for a balanced microphone on an XLR3 socket: twin screened wire should be used for connection.
Termination follows the convention i.e. pin 1 – Screening; pin 2 - Signal go; pin 3 – Signal return. MIC 1 has
the added facility of being able to duck all other inputs on the presence of a signal. No additional wiring is
required and the switch to activate this facility (VOX) will be found at the front. Compact disc and tape players
will use the LINE IN phono (RCA) socket and need to be terminated with a phono (RCA) plug, the live (inner)
wire going to the central pin with the outer screening being soldered to the body. If a recording facility is
required then suitable feed can be found by using the SLAVE OUT socket at the rear. Connect as for players
(see above) This socket can also be used for distributing a signal to up to ten POWER DYNAMICS slave
amplifiers. Caution Care must be taken when fitting any connectors to avoid damaging the cable or the
connector through excessive heat from the soldering tool.
LOUDSPEAKERS
All connections to the loudspeaker terminals should be made suing suitable spade lugs crimped or soldered to
the loudspeaker cables. Any other method can give rise to short circuit. There is provision for both 100 volts
line and low impedance loudspeakers but it is not advisable to use both together. Low Impedance
loudspeakers should he connected in a series parallel arrangement such that the total load is never less than 8
ohm. i.e. two 4 ohm loudspeakers could be connected in series and connected between the common and the 8