N1500i FACS Manual
20
Part No. 729-110-053 V.1.03
© 2018 Nelson Stud Welding, Inc. All rights reserved.
3.3 Weld Parameters
You can set welding parameters on this unit in 2 ways:
1.
Directly set the current and time values.
2.
Use the Stud Expert mode based on stud diameter.
3.3.1 Setting Weld Current and Reading the
Weld Current Display
The weld current setting is the current setting during a weld, and can
be viewed in the front
panel’s upper display. It can be changed using
the Up/ Down arrow keys to the right of the current display in one (1)
amp increments. As each of these keys are pressed, the current setting
will increase or decrease at a faster rate.
After each weld, actual current and time will be displayed briefly be-
fore the set values are displayed again.
If the display shows an actual weld time that is much longer than
the set value
- e.g., the sum of the front panel time and F2 (short circuit
on-time) - then a cold plunge may have occurred, which can result in a
bad weld. If this condition persists, it is recommended to perform a gun
calibration to set the F31 value, and check the physical condition of the
gun for any possible cause which could have prevented a normal drop.
If the actual weld time is much less than the front panel time
, then
it means that the arc shorted early. This could indicate an improper
gun lift setup.
When the display shows WAIT when the trigger is pulled
, it means
the rated duty cycle was exceeded during operation (or other fault
condition, see Section 4.2). It is advised to check the value of F2 and
possibly reduce the value of F2 to reduce the on-time and increase the
studs per minute without cold plunge.
In normal operating modes, the desired current setting and the actual
current will be the same or very close. In this situation, the display does
not change during or after a weld. However, in conditions where it is
not possible for the power source to deliver the desired current, a
warning light will light on the front panel display. This typically occurs
when using high currents with weld cables having a small diameter, or
cables that are excessively long.
3.3.2 Setting the Weld Time and Reading the
Weld Time Display
The time setting is shown on the front panel lower display. It can be
