Tweco WC 1 Weld Sequence Controlle - Manual (Page 12)

8
the Host controller to validate the weld sequence. Four relay outputs provide the following
information to the host controller:
•
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.
The interface also provides a ESTOP circuit and six 24 vdc inputs that provide the following control
functions:
•
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.
•
INP 1 – SCHED 0 – User definable spare input. Under remote schedule mode this input
can be used for weld schedule selection (Bit 0).
•
INP 2 – SCHED 1 - User definable spare input. Under remote schedule mode this input
can be used for weld schedule selection (Bit 1).
•
INP 3 – SCHED 2/ PARAMETER SELECT - User definable spare input. Under Remote
Schedule Mode this input can be used for weld schedule selection (Bit 2). Under Remote
Control Mode this input is used to select the parameter to Increase/Decrease. When
Cleared the Current is selected. When Asserted the Wire Feed speed parameter is
selected. This option is only active when the optional wire drive and when the Remote
control mode is enabled.
•
INP 4 – SCHED 3/ INCREASE PARAMETER – User definable spare input. Under Remote
Schedule Mode this input can be used for weld schedule selection (Bit 3). Under Remote
Control Mode activating this input will increment the selected parameter as specified by
INP3.
•
INP 5 – SCHED 4/ DECREASE PARAMETER - User definable spare input. Under
Remote Schedule Mode this input can be used for weld schedule selection (Bit 4). Under
Remote Control Mode asserting this input will decrease the selected parameter as
specified by INP3.
•
INP 6 - CYCLE START – This Input, when asserted, will start a weld cycle and must be
active during the complete weld cycle. If the input is reset the cycle will be terminated. If
the Spot Weld mode is enabled, the weld cycle will be terminated by the user defined weld
time. The Cycle start input must be reset before the next weld cycle can be initiated.
To use the Remote control interface the user must connect the PLC or Robot I/O to the internal
terminal blocks provide on the Main controller PCB assembly. The Remote Control function must
be enabled via the RS-232 serial port terminal command. See Section 7 for additional information.