power requirements
The X-Four power supplies have certain electrical requirements for proper operation. If possible the power supply should be connected to a dedicated circuit. Should any other appliance on the same circuit draw enough current to overload the circuit,the breaker or fuse will trip causing loss of power to the console.
The power switch on the supply front panel is also a circuit breaker; there is no power fuse.Should the supply ever shut down,or trip at start up,sim- ply push the switch to the off position and then push on again.
ground linking
SAFETY CONSIDERATIONS—each new power supply is shipped with the AC third-wire ground connected to the console chassis ground.The connec- tion is made at the rear of the power supply unit.This is necessary for safe- ty reasons so that exposed metal parts are grounded. In the event of a live conductor making contact with the console chassis or the power supply chassis then the current will flow to ground without a safety hazard arising.
Uninterruptible grounding—in a fixed installation for example,make a con- nection directly to the console chassis from the safety ground. Disconnect the ground link on the rear of the power supply.This disconnects console ground from power supply AC third-wire ground which could possibly create a hum-loop.
twin-supply operation
When twin-supplies are in use for automatic back-up, then the ground links on both supplies should be fitted.
In a situation where the safety ground to the console chassis has been con- nected and the ground path via the power supply is causing a hum-loop, then disconnect the ground links on both power supplies.
Note the maximum cur- rent draw specifications at left.
Be sure that the circuit to which you connect the sup- ply can handle the draw.
When the console is dis- connected from the power supply the chassis ground connection to AC third-wire ground is broken and safety protection is lost.
