If it is desired to completely power off
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) |
Amperage | 4 A |
CAP
FUSE
HOUSING
POWER END
Figure 5.4.4 Fuse
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.
GROUND
LIFT
SWITCH
| ON |
EIA- |
|
TERMINATE | OFF |
485 | LIFT |
AUD | |
GROUND |
|
IO |
|
LIFT |
|
SIGNAL END
Figure 5.5.2a Ground Lift Switch
| 2X |
|
|
|
| AUDIO |
|
| |
| SHIELD |
|
| |
| PINS |
| AUDIO | |
PHOENIX CONNECTORS |
| EMI | ||
AUDIO A | GROUND | |||
| FILTER | LIFT |
| |
|
|
| ||
|
|
| SWITCH | |
|
| EMI | LIFT |
|
| AUDIO B |
|
| |
| FILTER |
|
| |
|
|
|
| |
|
| CHASSIS/MAINS | AUDIO | |
|
| GROUND | GROUND | |
Figure 5.5.2b Ground Lift Function
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