APPENDIX A: TECHNICAL SPECIFICATIONS
875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING
POWER SUPPLIES
A-14
990-290
CAUTION:
If weld schedules are chained together, do NOT change polarity. All schedules in the chain
must have the same polarity or the relay contacts may be damaged.
Step Counts
STEP COUNTS between 00001 and 99999 can be specified. The Step Counter counts down to 0. If a
weld schedule is not completed and/or the WELD/NO WELD switch is set to NO WELD, the Step
Counter will not be decremented.
Audible Buzzer
During alarm conditions, an audible tone (buzzer) is generated for 5 seconds. It can be immediately
silenced by pressing [RUN]. It is also used to signal the operator of an incorrect keyboard entry. The
volume can be adjusted with a potentiometer on the control printed circuit board. The potentiometer is
accessible for adjustment through a hole in the upper, front, right-hand corner of the cover.
End Of Cycle Buzzer ON/OFF
This feature is normally used with manual heads. ON means that an audible signal will be given at the
end of each weld sequence as a signal to the operator to release the footpedal. The end of cycle buzzer
is controlled from the options menu.
Key Click
Whenever a key is pressed, a click sound is generated.
Weld Counter
A seven-digit weld counter automatically increments after each complete weld sequence. This counter can
be reset back to 0 at any time unless the system security is in the protected state.
The Weld Sentry option allows you to set upper and lower limits for each Weld Sentry program. To
implement this feature, there are three additional counters which keep track of the number of welds: under
the lower limit (999,999), over the upper limit (999,999), and within these limits (9,999,999). These
counters can be independently reset to 0 at any time, unless system security is in the protected state.
Note that all counters retain their counts when the input power is interrupted, because the contents of these
counters are stored in battery-backed-up memory.
Alarms