Tweco WC 1 Weld Sequence Controlle - Manual (Page 5)

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1.0 GENERAL DESCRIPTION
1.1 Overview
The following is a brief description of the WC 1 Thermal Arc Weld Sequence Controller. The WC 1
controller is based on an embedded micro controller. The Controller provides two 0-10 VDC
programmable outputs, one is used to control the Thermal Arc Plasma Power source and the
second, controls a Cold Wire Feed Motor Drive Control. The Controller provides 32 user selectable
weld schedules.
1.2 Control Outputs
The controller has five solid-state isolated relay outputs. One output is configured as an arc start
signal to the Thermal Arc power source. The remaining four has the following default configuration:
•
CR1 - Ready – This output is asserted when the Controller is operating normally. It will
reset when the controller is in ESTOP or an Internal/External fault has occurred.
•
CR2 - Arc Active – This output is asserted after the arc is established. The signal is
generated from the Thermal Arc power source. The output is cleared if a loss of arc is
detected, internal Program fault, or the cycle start signal is reset.
•
CR3 - Cycle Complete – This output is asserted when the programmed weld cycle has
been completed. If a fault or loss of arc has occurred during the cycle the Cycle complete
will not be set.
•
CR4 - Cycle Active – This output is active during the complete weld cycle and will be
cleared at the end of all programmed events.
1.3 Control Inputs
The Controller provides nine 24 VDC Optically isolated inputs. Three inputs are dedicated for
ESTOP, Arc Active and Pilot Arc Active. The Arc Active and Pilot Arc Active inputs are connected
to the Thermal Arc power source. The ESTOP input may be internally set to the active state. The
remaining six inputs may be configured for remote schedule or program control. The nine inputs
have the following default configuration:
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ESTOP – This input must be active. If the ESTOP is cleared the control performs an
emergency stop and halts the weld cycle and resets all outputs. When asserted the
controller performs a power up sequence.
•
ARC ACTIVE – When asserted the controller will initiate the Start Timer Event. If the weld
is not initiated within 2 seconds of cycle start the control will terminate the weld cycle and
clear the Ready Output. The user must clear the Cycle start input to reset the Ready
output.
•
PILOT ARC ACTIVE – This input must be asserted to set the Ready output and to allow
the controller to perform a weld cycle. An external jumper can force this input.
•
INP 1 – SCHED 0 – User definable spare input. Under remote schedule mode this input
can be used for weld schedule selection (Bit 0).
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INP 2 – SCHED 1 - User definable spare input. Under remote schedule mode this input
can be used for weld schedule selection (Bit 1).