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Checking the functioning:
With built-in NRS 90206 and operational amplifier, the READY indicators (7) have to be lit. Use the TEST
button (3) to check and reset the pilot function. When keeping the TEST button pressed, the 19 kHz
oscillator is switched off, the READY indicators go out, and the READY fault relay is being reset. After
approximately 3 seconds, when the TEST button is released, the READY indicators will light again.
9.2 NRS 90207 ground fault surveillance
The VDE regulation DIN VDE 0800 has to be obeyed when planning and afterwards operating 100 V
sound reinforcement systems. Especially 100 V alert systems have to be in accordance with all protection
measures for class 3 appliances.
Therefore, we recommend for off-ground potential speaker network installations the use of the ground
fault surveill ance module NRS 90207 for automated surveillance of the network insulation. Error
registration: A ground fault message signals that a damaged cable has been detected – possibly resulting
in an upcoming cable interruption – or a wrongly connected cable, possibly resulting in malfunctioning.
Whenever the DPA 4410 is operational or connected to an intact battery, the message “Ground Fault” is
given out even with short-time ground fault occurrences (>5 sec). The ground fault message appears as
collective fault message at the READY relay’s off-potential contact on the REMOTE CONTROL D-Sub
connector (16).
The extension kit NRS 90207 comes as a plug-in printed board assembly, providing monitoring circuitry
with error-storage and display driver for four 100 V outputs.
Installation of the NRS 90207 (see also diagram 8):
- Follow the descriptions given in paragraph 8 to open the appliance.
- Be sure to first insert the included board-guides before installing the printed circuit board, assuring the
correct position of their guide grooves. The release lever of the guides marked as “C” points to the top,
while the one of the guides marked as “D” points down.
- The printed circuit board has to be inserted into the guides with its printed side pointing to the top,
until it firmly locks in place.
- Reassemble the appliance following the descriptions under paragraph 8.
Checking the functioning:
With built-in NRS 90207 and operational amplifier, the READY indicators (7) have to be lit. When using
an external switch to shortcut one pole of the 100 V speaker network via a 47 kohms resistor and the
ground conductor, the GROUND FAULT indicator (6) has to light and the READY fault relay has to reset.
After releasing the button, the messages has to stay present. Use the TEST button (3) to reset the ground
fault surveillance function.
9.3 NRS 90208 input transformer
The DPA 4410 is prepared for the installation of the optional input transformer NRS 90208. In case
off-ground potential inputs are needed, one NRS 90208 has to be installed per input channel.
Installation of the NRS 90208 (see also diagram 8):
- Follow the descriptions given in paragraph 8 to open the appliance.
- Follow the descriptions given in paragraph 11 (exchange of the fuses F502 and F503) to detach the rear
cover plate.
- Detaching the input printed circuit board 81330.1:
first disconnect the four flat cables and then detach the screws of the input sockets.
- Before inserting the input transformer make sure to unsolder the resistors for: T101 : R101/R102, for
T102 : R121/R122, for T103 : R141/R142, and for T104 : R161/R162.
- Attach the input transformer onto the printed circuit board, so that the markings on both parts are
alligned.
- For the re-installation of the printed circuit board follow the same steps as mentioned above; just in the
opposite order.
- To attach the rear cover plate follow the descriptions given in paragraph 11.
- Close the appliance in accordance with the descriptions in paragraph 8.
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