Operation; Lph 120 Controls - ESAB LPH 120 Instruction Manual

5.

OPERATION

- Do not operate unit with cover removed.
- Do not feed unit while it's being held or carried.
- Do not touch any part of torch head (nozzle, heat shield and electrode) when unit is turned on.
- Wear helmet with No. 6 or 7 lens.
- Wear eye, ear and body protection.
Position machine at least 3 m from cutting zone. Sparks and hot slag can damage it.

5.1 LPH 120 CONTROLS

A. POWER SWITCH. Turns the unit on when set to 60A/90A/120A, 'power' indicator lights green, fan starts
running.
B. OUPUT CURRENT CONTROL. Stepwise by means of POWER SWITCH.
C. AIR TEST BUTTON (on front panel of the unit) in test position enables setting pressure before cutting is
started.
The following activities shall be done to set the required pressure:
•
set air pressure knob 6 to maximum pressure (knob turned maximally to the right
•
when air test button 3 pressed, set the pressure of 5,2 bar by means of pre-regulator on air filter 19
, observing the readings of pressure gouge 7
•
when air test button 3 pressed, set the pressure of 4,9 bar
•
block the air pressure knob and air filter pre-regulator before turning
D. FAULT LIGHT. Will glow yellow under following conditions:
FLOW FAULT. Indicates too low air flow rate. (continuous light, only when el-valve opened)
OVER TEMPERATURE. Indicates that duty cycle has been exceeded. (flashing light)
Allow unit to cool down before returning to work.
After fault abates, all signals will automatically reset.
E. ARC-ON LIGHT. When lit red indicates that main contactor is closed, which means torch is
energised (CAUTION! 310V) and source is ready to cut. In case of no indication while torch switch is
depressed immediately turn the machine off and call service.
NOTE: ARC ON light may turn off if within 2 sec since torch switch is depressed cutting process will not be
proceed. It is automatic feature that guarantees safe operation of machine (obligatory for units with S
symbol).
ELECTRIC SHOCK CAN KILL!
ARC RAYS CAN BURN EYES OR SKIN!
NOISE CAN DAMAGE HEARING!
Fig. 5-1. LPH 120 Controls.
! WARNING !
! WARNING !
CAUTION
by means air pressure knob 6
- 50 -
)
No. Description
1 power switch knob
2 "power on" LED
3 air test button
4 "arc on" LED
5 "fault" LED
6 air pressure knob
7 pressure gauge
8 line outlet (rubber)
9 current cable socket
10 wheel
19 air filter-preregulator