Nelson Nelweld 4000, Руководство по эксплуатации и обслуживанию

Страница: 39 / 69

Nelweld Operations and Service Manual
- 39 -
By default, the power source is shipped with the
gas valve control disabled. Special function F14
must be used to enable the gas valve option.
There are two adjustable parameters associated
with the gas valve control:
• Gas Valve Preflow Time – after the trigger is
pulled, the gas valve is energized for a short
period of time before the weld is initiated.
This allows the gas line to be purged of air
and to ensure adequate shielding. This time is
represented by t
1
on the “Timing Diagrams”
in Section 7.1 of this guide. It can be adjusted
using special function F15, and has a default
value of 500 milliseconds (0.500 seconds).
• Gas Valve Postflow Time – after a weld is
completed, the gas valve continues to be
energized for a short period of time to
maintain the gas shield while the weld metal
solidifies and cools. This time is represented
by t
2
on the “Timing Diagrams” in Section 7.1
of this guide. It can be adjusted by using
special function F16, and has a default value
of 500 milliseconds (0.500 seconds).
4.8.3 Stud Feeder Interface Kit: Tech Install
All Nelweld models are capable of interfacing
with an external stud feeding device using the
Stud Feed Interface Kit. With this kit installed,
an isolated contact is provided to trigger the stud
feeding device.
To install this kit, a connector assembly is added
as part of a replacement output panel, and a
wiring harness is simply plugged into the existing
SCR Power PC board. Special function F21 must
be used to enable the control of a stud feeder.
There are three adjustable parameters associated
with the stud feed option:
• Feed Signal Level – using special function
code F22, the feed signal level can be
selected, allowing “normally open” or
“normally closed” operation. The default
setting for this function is “normally open.”
•
Feed Signal Style – the feed signal can be set
to occur after the weld is completed (“after
weld”) or after contact to the welded stud is
lost (“contact loss”). “After weld” is used for
very high speed applications, while “contact
loss” is typical for most other applications.
Special function F23 adjusts this parameter,
which has a default setting of “contact loss.”
• Feed Signal Pulse Width – this time is
represented by t
7
on the “Timing Diagrams”
in Section 7.1 of this guide. It can be adjusted
as required by using special function F24, and
has a default value of 10 milliseconds (0.010
seconds). A value from 100 to 500
milliseconds (0.100 to 0.500 seconds) is
recommended.
4.8.4 Second Output Kit: Tech Install
Nelweld power supplies can accommodate
welding by up to two users. Units that are
manufactured as single gun units may be
converted to dual gun units through the
installation of a Second Output Kit. This kit
consists of a control panel, an output panel, a
bridge assembly, and associated wiring and
hardware.
Part numbers for Second Output Kits are listed in
the
Nelweld Accessory and Kit Numbers table.
4.8.5 RS-232 Port Kit: Tech Install
This kit allows for interface between a personal
computer or laptop. An RS-232 port is necessary
for any additional Nelson software kits (Nelware
kits) that require communication between the
Nelweld unit and a computer. The kit is only
needed for units that do not have a factory-
installed RS-232 port.
The kit consists of a front panel socket assembly,
a drilling template, and a 10-foot (3.0 meter) long
isolated RS-232 interface cable. The user can
extend this cable up to 25 feet. With the use of
additional hardware, this distance is virtually
unlimited.
4.8.6 Remote Control Kit: Tech Install
The Remote Control Kit allows the use of a
computer to emulate the front panel interface to
provide remote operation of the power source.
This kit includes Nelware Remote Control