Hypertherm PHC Sensor - Manual (Page 33)

Section 2: Installation and Setup 33
Plasma Interface Signals
WARNING: HAZARDOUS VOLTAGE & ENERGY The plasma interface signals from
plasma cutting equipment without an internal voltage divider are directly connected to
the plasma cutting circuit output. To prevent electrical shock and energy hazards,
wiring from the plasma cutting circuit of the power supply to the plasma interface
(228256) must be enclosed or protected.
Hypertherm Powermax systems are equipped with a factory-installed internal voltage divider which is designed
to be safely connected without tools to the Sensor™ PHC plasma interface using the standard PHC to
Powermax cable provided by Hypertherm.
The plasma interface (228256) includes the arc voltage divider for connection to Hypertherm Powermax
plasma supplies not equipped with a factory installed internal voltage divider and other plasma supplies.
However, the wiring from the plasma cutting circuit to the 228256 must be enclosed or protected for safe
operation and use. The plasma cutting circuit output ratings are printed on the data plate and vary by
manufacturer and model up to 500 VDC and 400 ADC, such that contact with metal live parts of this connection
under normal operating and fault conditions can result in death or burns.
To make connections between the plasma cutting circuit and 228256:
- Use qualified service personnel only.
- Turn OFF and disconnect all power.
- Mount the 228256 as close as is practical to the entry point to the power supply. Permanent
connection is recommended.
- If cord connected, use jacketed cables suitable for the environment.
o Verify that the outer jacket of each interconnecting cable is protected from damage at the entry
point to the power supply. A strain relief is recommended.
o Verify that the outer diameter of the interconnecting cable fits the strain relief with provided
228256:
ƒ Plasma start, transfer grip: .114" - .250" diameter
ƒ Plasma interface grip: .064" -.210" diameter
o Strip back the outer jacket and individual conductor insulation as needed.
o Insert the outer jacket cable through the strain relief and make connections as shown in Figure
16 on page 34.
o Verify the outer jacket is a min. of 1 inch (2.54 cm) inside the 228256 and tighten the strain
relief(s).
- Before operating the equipment, verify that the connections are correct and that all live parts are
enclosed and that all jacket/conductor insulation is protected against damage.