REHM BARRACUDA RTC 100, Operating Instructions Manual

Page: 13 / 55

Description of Function
13
3 Description of Function
3.1 Preparations for cutting
3.1.1 Mains connection and power-up
REHM cutting equipment is fitted with a Euro CEE plug for 3x400V three-phase
alternating current. The equipment is connected to the power supply voltage via
the main switch on the front side. The control lamp MAINS ON shows that the
equipment is ready for operation.
3.1.2 Adjustment of compressed air
–
gas test
The pressure and the flow rates for cooling and cutting air must in each case be
appropriately adjusted to the torch used. If the gas pressure is incorrectly set,
cutting quality will be reduced, wear and tear will be higher and, under extreme
conditions, the torch could be destroyed. The necessary air pressure must be
adjusted using the adjustment knob provided for this purpose on the control
panel.
To do so, turn the function selection switch to the “GAS TEST” position and pull
the blue adjustment knob upwards. Continue turning in this position until the
pressure displayed on the pressure gauge corresponds exactly to the required air
pressure. Then push the rotary knob back down to lock it. The setting is now
protected against inadvertent adjustment. After that, to begin cutting operation,
switch the function selection switch back to 2-step or 4-step operating mode.
3.1.3 Operating modes
3.1.3.1 2-step operating mode
In this operating mode, the torch button is kept pressed down throughout cutting
until cutting is terminated. Releasing the torch button terminates the cutting
operation, just as does extinguishing of the arc.
This operating mode is recommended for short, alternating cutting operations.
3.1.3.2 4-step operating mode
After ignition of the cutting arc, the torch button can be released. Reactivation and
release of the torch button terminates the cutting operation, just as does
extinguishing of the arc.
In this operating mode, it is possible to operate the torch effortlessly for extended
periods.
3.1.4 Choosing the cutting current
The current required depends essentially on the type of material to be cut and on
the material thickness Continuous adjustment of the cutting current supplied to
REHM BARRACUDA cutting equipment permits optimum adjustment to particular
cutting tasks.
If the current is set too high, this will lead to higher wear and tear of nozzle and
torch electrode. If the current is set too low, then either no material penetration
occurs or else this is too slow.