3.4. AC Input Connection
Warning
Disconnect AC power from the mains and measure the AC input terminals to ground to ensure 0 Vac is present before attempting any installation procedure.
AC power is wired to the XR Series MagnaDC power supply by attaching three cables plus ground for 3-phase installations or two cables plus ground for 1-phase installations, available on 2 kW models only. A safety ground wire must be connected to the stud labeled with a ground symbol at the rear of the power supply.
Magna-Power recommends cables per the recommendations of the National Electrical Code or Suggested Ampacities of 4-Conductor Type S or SO Cable, crimped to ring terminals and securely fastened to the AC input studs at the rear of the power supply. The AC input connection points are four (4) 10-32 threaded inserts.
Note
The cable recommendations provided are for reference purposes only. Always consult local electrical code requirements to ensure compliance.
After connections are made, screw the four standoffs into the back panel and place the protective shield over the connections. This programmable DC power supply is designed to be permanently connected to the power source requiring a readily accessible disconnect device incorporated into the fixed wiring.
3.4.1. AC Input Current
The following table provides the maximum input current rating for the available AC input voltages and power levels of the XR Series. All AC input currents factor in efficiency and power factor. With the product’s AC soft-start circuitry, there is no additional in-rush current; the numbers in the following table provide the peak AC current draw at full load. These same AC input current ratings are also specified on the product’s serial label. These ratings, in combination with the conductor ampacity tables above, guide AC input conductor selection.
3.4.2. Fuse Rating
MagnaDC power supplies contain a variety of power and control fuses. For MagnaDC power supply products with a 1-phase input, there are two (2) power fuses and two (2) control fuses. For MagnaDC power supply products with a 3-phase input, there are three (3) power fuses and two (2) control fuses. The XR Series fuse table provides the fuse ratings and recommended replacements.
In the event of a fuse fault, power must be removed from the supply and the fuse must be replaced to correct this condition. A cleared power fuse usually indicates a power stage failure, often requiring factory attention. In addition, a cleared fuse can be caused by power surges from lightning storms or other AC transient events.
Warning
To avoid personal injury or damage to the XR Series MagnaDC power supply, use only the specified replacement fuses.