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When off-ground potential loudspeaker cable networks are employed we recommend insulation-monitoring using the
ground fault surveillance module NRS 90224. Error recognition: An occurring ground fault either signals that one of the
cables is damaged - which most likely point towards a total line interruption in the near future - or that connections
have been carried out erroneously which may lead to malfunctioning of the entire system. The fault message
GROUND FAULT (6) is also maintained with very short (>5 sec) ground faults, as long as the amplifier is powered-on
or a loaded battery is connected. The fault message is displayed via the red GROUND FAULT indicator (6). In case of
an inserted INPUT MODULE NRS 90225, it is also outputted as collective fault message with the floating contact of
the READY fault message relay via the REMOTE CONTROL connector (16). When using the REMOTE MODULE
NRS 90222, error occurrence is monitored and output by the PROMATRIX manager DPM 4000 (for further details,
please refer to the PROMATRIX handbook).
The installation has to be performed as follows (see figure 8 and/or figure 9):
Caution
Before opening the appliance, make sure to disconnect the mains and/or battery power source!
- To open the appliance, the top panel has to be removed.
- The extension kit NRS 90224 has to be inserted with its component side to the left (from the front view) until it clicks
in place.
- Re-install the top plate of the enclosure.
S 406
S 405
NRS 90 224
36
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