44
“HT4” CONTROL PANEL
WELDING MODE SELECTION LED
WELDING MODE SELECTION K
EY
WIRE K
EY
ENCODER K
NOB
- A
PARAMETER SELECTION K
EY
- A
PARAMETER SELECTION LED - A
PARAMETER DISPLAY S
CREEN
- A
SPECIAL FUNCTIONS (F
X
) LED
SPECIAL FUNCTIONS (F
X
) K
EY
GAS K
EY
ENCODER K
NOB
- V
PARAMETER SELECTION K
EY
- V
PARAMETER SELECTION LED - V
PARAMETER DISPLAY S
CREEN
- V
HOLD Function LED
PARAMETER DISPLAY S
CREEN
- A
Displays the value of the parameter
WELDING CURRENT
( ).
PARAMETER SELECTION LED - A
The LED unit shows the
WELDING CURRENT
( ) switched on.
ENCODER K
NOB
- A
Adjusts the
WELDING CURRENT
( ) parameter, interrupting the
HOLD Function
.
HOLD F
UNCTION
LED
Flashes for a set time, informing the operator that the
HOLD Function
is active.
PARAMETER DISPLAY S
CREEN
- V
Shows the parameter indicated by the
PARAMETER SELECTION LED - V
.
PARAMETER SELECTION LED - V
The LED unit indicates the welding parameter selected using the
PARAMETER SELECTION K
EY
- V
.
PARAMETER SELECTION K
EY
- V
Scrolls in succession the parameters
HOT START
( ) -
WELDING VOLTAGE
( ) -
ARC
FORCE
(
) only on the HT4 panel.
In this case the values displayed are those for
HOLD
(only for the welding voltage).
ENCODER K
NOB
- V
Adjusts the parameter displayed by the
PARAMETER DISPLAY S
CREEN
- V
interrupting the
HOLD
Function
.
SPECIAL FUNCTIONS (F
X
) K
EY
Only enables entering, interrupting the
HOLD Function
and exit afterwards from the
SPECIAL FUNCTIONS Menu (SET UP Fx)
on the HT4 panel and not on the DH panel.
6 - ACTIVATING THE VRD DEVICE
MMA
The Voltage Reduction Device (VRD) is a safety device that reduces voltage. It prevents voltages forming on the output termi-
nals that may pose a danger to people. The standard settings and those defined beforehand by do not provide for the VRD to be
active on the welding machine and so the
VISION S
CREEN
does not normally provide any indication.
If the operator wishes to weld in MMA using the VRD device (which must be done with the welding machine switched off), they must:
1) Use a suitable screwdriver to unscrew the 4 screws that fix the DH control panel to the welding machine.
2) Remove the “VRD” JUMPER on the DIGITAL INTERFACE PCB (see figure).
3) Use a suitable screwdriver to tighten the 4 screws that fix the DH control panel to the welding machine.
4) Start the welding machine by turning the switch on the rear panel to position I.
When it switches on, but with the machine in stand-by, the DH control panel shows that the VRD device is active (indication on
the
VISION S
CREEN
green colour - see enclosed image: MMA - PRE-SETTING).
During the welding phase the VRD device is activated (indication on the
VISION S
CREEN
red colour (does not indicate malfunction-
ing of the welding machine) - see enclosed image: MMA - WELDING) and when welding is ended the voltage will be reduced
within a maximum time of
0,3
seconds.
