WTC MedWeld 3005, Operator'S Manual

Page: 71 / 206

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SCR THERMAL SWITCH Input
This input to the weld processor indicates that an SCR has
reached an over-temperature condition. It also acts as a ready
to weld (RTW) signal from the regulator board to the inverter
assembly.
If this input is not active when the control receives the signal
to initiate a weld schedule, the weld processor generates a
SYSTEM COOLING fault and de-energizes the NO FAULT
output, to indicate an active fault condition. It completes the
sequence in no weld.
The weld processor also generates a SYSTEM COOLING
fault and sequence in No Weld if the weld schedule contains
the function WAIT nnn CYC FOR SYSTEM COOLING and
this input does not become active within the number of
cycles specified.
SYSTEM COOLING Input
This input tells the weld processor the state of the contactor
cooling system. If the weld schedule contains the function
WAIT nnn CY FOR SYSTEM COOLING and this input does
not become active within the programmed number of cycles,
the weld processor completes the weld schedule in No Weld.
The function CHECK SYSTEM COOLING will complete the
sequence in No Weld if the input is not active when checked
by the weld schedule.
If the schedule contains the unconditional wait function
WAIT FOR SYSTEM COOLING and the initiate is removed
before this input becomes active, the control will abort the
weld schedule and generate a SYSTEM COOLING fault.
RETRACT 1 PILOT Input
This input changes the state of the RETRACT VALVE 1
output. The action of the valve is based on the status of the
Retract Mode setup parameter.
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If your application is set to support dual-solenoid retract valves, this
input will activate Retract Valve A and B, based on the cylinder type
(CYL) setup parameter. Refer to page 6-11.
RETRACT 2 PILOT Input
This input changes the state of the RETRACT VALVE 2
output. The action of the valve depends on the status of the
Retract Mode setup parameter.