Hypertherm Powermax125 Service Manua - Manual (Page 31)

Powermax125 Service Manual 808070 31
2 – Power Supply Setup
Allow at least 0.25 m (10 inches) of space around the power supply for proper ventilation.
The power supply is not suitable for use in rain or snow.
To avoid toppling, do not set the power supply on an incline greater than 10 degrees.
Prepare the electrical power
Hypertherm (designated HYP on the data plate) input current ratings are used to determine conductor sizes for power
connection and installation instructions. The HYP rating is determined under maximum normal operating conditions, and
the higher HYP input current value should be used for installation purposes.
The maximum output voltage will vary based on your input voltage and the circuit’s amperage. Because the current draw
varies during startup, slow-blow fuses are recommended as shown in
Power connection for the Powermax125 on
page 32. Slow-blow fuses can withstand currents up to ten times the rated value for short periods of time.
Install a line-disconnect switch
Use a line-disconnect switch for each power supply so that the operator can turn off the incoming power quickly in an
emergency. Locate the switch so that it is easily accessible to the operator. Installation must be performed by a licensed
electrician according to national and local codes. The interrupt level of the switch must equal or exceed the continuous
rating of the fuses. In addition, the switch should:
 Isolate the electrical equipment and disconnect all live conductors from the incoming supply voltage when in the OFF
position.
 Have one OFF and one ON position that are clearly marked with O (OFF) and I (ON).
 Have an external operating handle that can be locked in the OFF position.
 Contain a power-operated mechanism that serves as an emergency stop.
 Have appropriate slow-blow fuses installed. See Power connection for the Powermax125 on page 32 for
recommended fuse sizes.
Requirements for grounding
To ensure personal safety, proper operation, and to reduce electromagnetic interference (EMI), the power supply must be
properly grounded.
 The power supply must be grounded through the power cord according to national and local electrical codes.
 Three-phase service must be of the 4-wire type with a green or green/yellow wire for protective earth ground and
must comply with national and local requirements.
 Refer to the separate Safety and Compliance Manual included with your system for more information on grounding.
CAUTION!
Protect the circuit with appropriately sized time-delay (slow-blow) fuses and a line-disconnect switch.