Amada Miyachi Unitek STA-100A, Operation Manual, Page: 31 / 154

CHAPTER 3: USING STA SERIES CONTROL FUNCTIONS
STA SERIES AC CONTROLS
990-351 3-3
DN1
– This is the downslope time for weld 1 of the sequence.
CO
– This is the cool time between weld 1 downslope and weld 2 upslope in the sequence.
UP2
– This is the upslope time for weld 2 of the sequence. (See
IMPULSE
)
W2
– This is the weld 2 time of the sequence.
DN2
– This is the downslope time for final weld 2 of the sequence. (See
IMPULSE
)
HLD
– This is the hold time (the time the valve is held on) after the
DN2
ends. (See
IMPULSE
)
OFF
– This is the off time at the end of the weld cycle. The electrode valve is turned off at the beginning
of hold (
HLD
) time. All other valves are turned off at the conclusion of
OFF
time.
NOTE: Some of the items in the
SCHEDULE
screen will differ depending on the Control’s operating
MODE
(described in Section VI, Mode Screen ).
CURRENT SETTING
– The current settings are presented directly below the
W1
and
W2
settings. When
CONTROL MODE
is set to
%HEAT
, the percentage of the available power is programmable from
000%
to
100%
. The minimum conduction angle is 20 degrees of power at a power factor of 1.0. As the power
factor decreases, the minimum conduction angle may increase. When
CONTROL MODE
is set to
PRI C.C.
or
SEC. C.C. ,
the current setting is programmable from
00.0kA to 80.0 kA . f
or best results, this value
should be between 20% and 95% of the full current. (Control may operate beyond this range, but not
within accuracy and regulation specifications.)
CH
– Force Output Channel selected. Settings include
NONE
(the Force option is not installed), and
F1-
F8
(The output for SCR 1 goes through F1, SCR 2 through F2 and so on). The
F1-F8
option allows the
Control to operate up to 8 independent electronic pressure regulators .
FORCE
– Force output (in lbs.) for the Force Output Board (electronic pressure regulator). See the
appendix for details on how to calibrate this option. This is the electronic pressure regulator output
only. This valve should be set to match the
FIRE=
firing force in the Monitor Screen. See Section IV:
Monitor Screen for programming limits on the force input option.
NOTE: The following six functions are identical for all three operational modes.
ElecValve
– This number indicates the valve that is associated with the welding electrode in the selected
schedule. It’s associated SCR appears to the right.
SCR #
– When there are multiple SCRs, the number presented represents the SCR that will be fired for
that schedule. It is programmable in the
System Wide Values
screen (below) from 1 to the number of
SCRs in the control (maximum of 8); the default is 1.
IMPULSE
– This number is the quantity of Weld 2 operations. It is generally used in applications such as
stitch welding, which involves a series of spaced spot welds, similar to a sewing stitch. Impulse is
programmable from
01
to
25
times, with a default of
01
. If there are more than one Weld 2 operations,
the programmed
UP2
time applies only to the first pulse and the programmed
DN2
time applies only to
the last pulse, after which the
HLD
and
OFF
times occur. The time between each Weld 2 pulse is
determined by the programmed
CO
time.