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14.3 NRS 90222 remote module .........................................................................................................69
14.4 NRS 90224 pilot tone and ground fault surveillance........................................................................70
15. Warranty ...........................................................................................................................................72
1. Utilization
The amplifiers DPA 4120 and DPA 4140 are specially designed for the power-consistent and reliable operation of PA-
systems. The DPA 4120 and DPA 4140 are intended to be used in company intercom, alarm and background music
transmission installations, offices and commercial areas, congregation and sport centers, schools, churches, hotels,
hospitals, shopping malls and super markets, cruise ships, and other similar applications.
2. Installation
When installing the amplifiers, it is important to assure that for ventilation reasons the front-to-rear air circulation is
guaranteed (for details on 19"-case or 19“-rack shelf installation please refer to paragraph 9).
To maintain EMC it is necessary that all input, output, and control lines – except for the power cords – are shielded.
Within metal housings or closed rack shelf systems, unshielded output and control cabling is allowable. Shielding is
accomplished by connecting the individual cable screens to the enclosure or rack shelf ground potential.
The amplifier has to be protected from:
- water drops or splashes
- direct sunlight
- high ambient temperatures and the direct radiation of heat sources
- high humidity and moisture
- heavy dust
- massive vibrations
Moving the amplifier from a cold into a warm environment can result in the occurrence of condensation on inner parts.
Operating the appliance is only permissible after it has accommodated to the altered temperature (approximately after
one hour).
Should it happen that foreign solid parts or liquids inadvertently intrude the enclosure, unplug the device from the
power source and have it checked by a DYNACORD service center, before using it again.
Cleaning the appliance should not be performed using chemical solvents or sprays, as this might damage the finish
and moreover could cause hazard fire.
3. Before the first operation
These power amplifiers are designed to be operated with different input modules. The general input module NRS
90225 is meant for all conventional applications. It allows to remotely start the amplifiers via control lines, monitor their
operation by use of the incorporated fault relay, and monitor the transmitted audio signals through the monitor output.
Using the remote control module NRS 90222, the amplifiers are connected to the PROMATRIX manager DPM 4000
via RS-485 remote interface providing complete remote operation and surveillance. The desired input module has to be
inserted into the module shaft on the rear of the power amplifier. It has to be tightened using the two locking screws
(B) (refer also to the paragraphs 8.1 and 8.2).
3.1 Mains operation
For normal AC mains operation, the included mains cord has to be connected to a 230V or 115V 50/60Hz wall outlet.
On the appliance itself, the cord has to be connected to the 3-pole mains socket (10).
Caution The appliance is factory preset to 230V AC. Switching to 115V AC is accomplished using the voltage
selector (12).