Amada Miyachi Unitek STA-100A, Operation Manual, Page: 44 / 154

CHAPTER 3: USING STA SERIES CONTROL FUNCTIONS
STA SERIES AC CONTROLS
3-16 990-351
Pressure Switch
= This turns the
Pressure Switch
function
ON
and
OFF
. When this function is turned
ON, a weld will not proceed until both the footswitch input and the pressure switch inputs are closed.
If this input does not close in approximately 5 seconds, the unit gives a “Pressure Switch Alarm” on
the screen and a fault output.
NOTE:
This is for an external pressure switch on the weldhead. Normally this is
OFF
. Turn
ON
only
when using an external pressure switch on the weldhead.
Force Calibration
= This accesses the
Force Calibration
screen. Instructions for using this screen are
in Appendix H, Force Control Option.
Output Force
= This turns the Output Force function to Channels
F1-F8
, or
OFF
.
F1-F8
means the
output for SCR 1 goes through F1, SCR 2 is associated with F2 and so on. The
F1-F8
option allows
the control to operate up to 8 independent electronic pressure regulators .
Monitored Volts
= This switches the voltage monitoring mode between
PEAK
and
RMS
(Average).
Monitored Time
= This switches the weld monitoring time between
W1/W2
(Weld 1 and Weld 2) or
Last Cycle Only
. This setting applies to the voltage monitoring option only. Selecting
W1/W2
causes
the unit to monitor the voltage during the
W1
period and the
W2
period, ignoring any upslope and
downslope. Selecting
Last Cycle Only
causes the control to look only at the last cycle in the
W1
and
W2
periods.
DIFF PRESSURE =
This turns the force input functions (differential pressure)
ON
and
OFF.
When this
function is turned on, actual force readings from each weld will be displayed on the monitor screen.
High, low and firing force limits can be programmed in the monitor screen, and welding will not
proceed until the actual value is within those limits.
Back Pressure
= Using the keys, you can increment/decrement the Back Pressure (in psi). Back
Pressure is the pressure that is sent by the electronic pressure regulator to the bottom of a weld head’s air
cylinder when a schedule is not operating. The psi setting for this parameter will only be accurate if the
electronic pressure regulator has the association of 0-10VDC = 0-100psi.
Screen 2

--
Returns you to
SYSTEM VALUES SCREEN2.