WTC Technitron T2050 - Faults and Messages; Fault LEDs on the Data Entry Panel; Specific Fault Conditions

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When a fault listed on the DEP occurs, the LED next to the fault
will blink on and off. This distinguishes the fault condition from a
sequence instruction in the other column. One fault is displayed
at a time, so that the proper message can be shown on the
numeric display. Clearing a fault displays the next fault (if any).
To clear faults, press the FAULT RESET button.
5=5B75>3ICD?@ This indicates that the ESTOP input has been de-energized. The
sequence is halted and the VALVE output is removed. The
display will flash "E_S," for Emergency Stop. Emergency stop is
monitored through U10.
3?>D13D?B6Qe\d This indicates the voltage that should be developed across a SCR
contactor that is off is missing. It means that the SCR is shorted,
or the line voltage is disconnected. The contactor off voltage is
checked before the valve is energized, to prevent the tips from
closing energized. It is also checked during normal sequence
operation. The display will flash "C_F," for Contactor Fault. The
voltage is monitored by op amps U5, U22 and U6.
?F5BD5=@6Qe\d This fault indicates that the over-temperature switch on the SCR
is open. The display will flash "O_F," for Over temperature Fault.
The over-temperature switch is monitored with +40 VDC
through U10.
!"3I3<56Qe\d This indicates that the SCR failed to fire on time for three
consecutive half-cycles of the same polarity. The display will
flash "H_F" for Half cycle Fault. The feedback voltage is
monitored by op amps U5, U22 and U6.
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During the dynamic process of controlling weld current, the weld
control tried to exceed 99% or go below 20% of available current.
When this fault occurs, "HI" (Compensation over 99%) or "LO"
(Compensation under 20%) will flash on the display to show the
direction of the effort. It means that the control could not deliver
the requested current and therefore the last spot weld may be
bad. Refer to Configuration Item Definitions, Turns Ratio and AVC
Setpoint.