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2.2 System Inputs/Outputs
The inputs provided to the welder are used to control the weld cycle and
monitor the 900IW+'s hardware.
2.2.1 PALM BUTTONS/START Signal - START Connector
These inputs are used to start the weld cycle. To start a weld cycle, both
PALM BUTTON inputs must become active within 100 ms of each other,
and remain active until TRS activates, or an error will be generated and no
weld will be performed.
Errors will also be generated if the PALM BUTTONS do not remain active
until the TRS input becomes active (for maintained software), or are not
inactive within 4 seconds after the solenoid valve drive circuits have been
disabled.
2.2.2 EXTERNAL RESET - ALARM Connector
This input, when activated, will simulate pressing RESET (for further
information, see Figure 2-2 "Front Panel Displays," callout 7). You cannot
start a weld cycle if the EXTERNAL RESET line is active.
2.2.3 READY Signal - ALARM Connector
The welder uses the Upper Limit Switch (ULS) input to determine when
the carriage has started to descend and when it has reached its "home"
position on its return at the end of the weld cycle.
The programmer evaluates other system conditions as well before
generating the READY signal. It evaluates if any alarm conditions exist.
Monitoring this signal indicates that the welder is at rest and it is ready to
cycle (for example, not in TEST, HORN DOWN, latched alarm condition or
system fault).
2.2.4 GENERAL ALARM - Alarm Connector
GENERAL ALARM is a signal which indicates that an alarm has been
sensed. Resetting alarms and resolving system faults clears this alarm
signal. Refer to Section 4.6.2 "Weld Cycle Alarms and Error Messages" for
further information.
900IW+
2-7
Controls
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