EAW DSA250i - Manual (Page 25)

If it is desired to completely power off (de-energize) the module, a
conveniently located ac mains disconnect must be supplied or the power
cable must be unplugged from the module or the ac mains supply.
The PowerCon connector is a locking connecter. To lock, twist 1/4 turn
clockwise after fully inserting into the jack. It is recommended the
connection be made at the module before connection to the ac mains supply.
5.4.4 AC MAINS FUSE
If excessive ac mains input current is detected, an internal fuse can blow.
This can occur for a variety of reasons, such as internal failure,
excessive ac mains voltage, or excessive amplifier output levels.
If the fuse blows, the fuse must be replaced with a fuse of the correct
type and rating as listed below. In the unlikely event the fuse blows
again, internal failure is indicated. This will require troubleshooting and
repair by a qualified service technician. Do not attempt further use of the
module until such repairs are made. See Section 8.2 “Troubleshooting”.
Fuse Type: AG (0.25 in x 1.25 in) slow-blow
Amperage 4 A
5.5 Grounding
5.5.1 ELECTRICAL GROUND
Ensure that the ac mains grounding conductor in the power cable is
properly grounded in accordance with applicable electrical codes.
5.5.2 AUDIO GROUND
The Audio Ground Lift switch may help isolate audio ground loops.
This dip switch disconnects the internal audio ground from the chassis.
Use this switch as needed for reducing ground loop noise.
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POWER END
CAP
FUSE
HOUSING
Figure 5.4.4 Fuse
SIGNAL END
EIA-485 TERMINA
TE
AU
DIO GR
OUND
LIFT
ON
OFF
LIFT
GROUND
LIFT
SWITCH
LIFT PHOENIX
CONNECTORS
AUDIO A
AUDIO B
2X
AUDIO
SHIELD
PINS
EMI
FILTER
EMI
FILTER
CHASSIS/MAINS
GROUND
AUDIO
GROUND
AUDIO
GROUND
LIFT
SWITCH
Figure 5.5.2a Ground Lift Switch
Figure 5.5.2b Ground Lift Function