Hypertherm Powermax65 Mode D'emploi page 8

Machine interface for raw arc Voltage
11. From the fan side of the power supply, grasp the end of the cable. Carefully pull the entire length of the cable
through the opening while pushing the cable through the opening from the power board side. Leave enough cable
on the power board side to route the wires along the base of the power supply.
12. Route the cable through the strain relief nut, rear panel access point, strain relief, and strain relief retention nut. Pull
the cable through the strain relief leaving enough cable to rest in the bottom of the power supply without tension.
13. Secure the strain relief on the inside of the power supply using the strain relief nut. Hand tighten the nut and then
over-tighten slightly more.
14. Tighten the strain relief retention nut onto the strain relief to secure the cable.
Strain relief
retention nut
Cable direction
15. Secure the transformer to the base of the power supply with the two screws. Tighten the screws to 23.0 kg cm
(20 in.-lbs).
16. Push the fan shroud onto the fan housing.
17. Reconnect the two transformer wires to the power board. Tighten the screws to 34.6 kg cm (30 in.-lbs).
18. After you replace the component barrier and power supply cover in the sections that follow, you may connect the
other end of the cable to the equipment according to the manufacturer's instructions. Remember to observe polarity.
Note 1: The output of the internal voltage divider board is designed to prevent shock, energy and fire hazards,
and is intended to satisfy most codes and standards for external wiring outside the electrical enclosure.
All external wiring practices for an unprotected raw arc voltage should be reviewed and approved by
the local inspection authorities at the time of installation prior to operation and use. Raw arc voltage
wiring terminals and connections should not be exposed to accidental contact under normal and single
fault conditions. External wiring from an unprotected (that is, no voltage divider used in the power
source) raw arc voltage routed inside conduit between electrical enclosures will normally satisfy all
electrical codes and standards worldwide. Failure to address the hazards associated with live contact,
accessibility and single fault failures to this unprotected output can result in death or fire.
Note 2: A voltage divider board inside the CNC protects only the CNC and does NOT protect the external
interconnecting wiring between the power source and the CNC. Overcurrent protection may be
required to protect the user and/or machine in fault conditions.
Note 3: External wiring outside the electrical enclosure should be suitable for the installation and meet national
and local regulations (for example, NFPA 70 NEC, NFPA 79, Canadian Electrical Code, CSA/CAN
E60974-1, IEC 60204-1, BS 7671) or other codes and/or standards applicable to the installed site
where the equipment will be operated.
6
Rear panel of
power supply
Strain relief
Strain relief nut
inside power supply
Wire #1 (-)
Wire #2 (+)
Field Service Bulletin
M4 (#8) ring
M6 (1/4 in.)
ring