Filter
Top Products
7
SONAMP
®
875D SE 8-CHANNEL AMPLIFIER
Protection Circuits
Thermal Protection
If the amplifier’s cooling vents are blocked, or it is installed with inadequate ventilation the amplifier may
exceed its safe operating temperature. If the amplifier’s internal temperature exceeds 154°F (68°C) it
will self-protect, and the following will occur:
• The audio output to all connected zones will shut OFF.
• The front-panel P
ROTECTION LEDs (see
Figure 3
) will illuminate
yellow
.
• An over-temp message will be sent via RS-232.
Once a safe temperature (<67°C) is reached, the Protection LEDs will all extinguish. You can then
re-activate the amplifier, either by switching the front-panel Power button OFF and ON or by a ‘Power’
command if the amplifier is being serial controlled.
IIMMPPOORRTTAANNTT::
BBeeffoorree
rree-aaccttiivvaattiinngg
tthhee
aammpplliiffiieerr,,
ccoorrrreecctt
tthhee
pprroobblleemm
tthhaatt
ccaauusseedd
tthhee
oovveerr-tteemmppeerraattuurree ccoonnddiittiioonn
((vvoolluummee
sseett
ttoooo
hhiigghh,,
iinnaaddeeqquuaattee
vveennttiillaattiioonn,,
eettcc..))
NOTE: If you’re serial-controlling the 875D SE you can poll the amplifier at any time and its internal
temperature will be reported to the control device.
Over-Current Protection
If an over-current condition occurs in a zone, that zone will shut OFF for 5 seconds and its PROTECTION LEDs will flash ON
and OFF. The zone will then turn back ON. If the over-current condition continues the zone will shut OFF for 6 seconds,
its P
ROTECTION LEDs will flash, then it will turn back ON. If the over-current condition continues this process will repeat,
with the wait time increasing by 1 second each time. When the wait time reaches 10 seconds the zone will LOCK, the
zone’s P
ROTECTION LEDs will continually illuminate and the amplifier must be powered OFF using the front-panel POWER
button (or a serial command, if the amp is being controlled via RS-232).
BBeeffoorree ttuurrnniinngg tthhee aammpplliiffiieerr OONN aaggaaiinn,,
ccoorrrreecctt wwhhaatteevveerr iiss ccaauussiinngg tthhee oovveerr--ccuurrrreenntt ccoonnddiittiioonn iinn t
thhee zzoonnee ((ssppeeaakkeerr iimmppeeddaannccee ttoooo llooww,, vvoolluummee ttoooo
hhiigghh,, sshhoorrtt--cciirrccuuiitt,, eettcc..))..
PROTECTION
BBE ON
ACTIVE
Figure 3:
F
RONT-PANEL
STATUS LEDs