APPENDIX F: RELAY TIMING DIAGRAMS
UB25 LINEAR DC RESISTANCE WELDING CONTROL
990-665
F-3
OUT OF LIMITS
•
P1 HIGH LIMIT
•
P1 LOW LIMIT
•
P2 HIGH LIMIT
•
P2 LOW LIMIT
The relay will switch when the Control senses any
OUT OF LIMITS
condition. It will start 0 - 150
milliseconds after the end of
HOLD
and will stay energized until the
OUT OF LIMITS
alarm state is
cleared by pressing the
RUN
button, or at the start of the next weld.
•
P1 HIGH LIMIT.
The relay signal will switch when the Control senses that the Pulse 1 energy
is higher than the programmed upper limit. It will start 0 - 150 milliseconds after the end of
HOLD
and will stay energized until the
OUT OF LIMITS
alarm state is cleared by pressing the
RUN
button, or at the start of the next weld.
•
P1 LOW LIMIT.
The relay signal will switch when the Control senses that the Pulse 1 energy
is lower than the programmed lower limit. It will start 0 - 150 milliseconds after the end of
HOLD
and will stay energized until the
OUT OF LIMITS
alarm state is cleared by pressing the
RUN
button, or at the start of the next weld.
•
P2 HIGH LIMIT.
The relay signal will switch when the Control senses that the Pulse 2 energy
is higher than the programmed upper limit. It will start 0 - 150 milliseconds after the end of
HOLD
and will stay energized until the
OUT OF LIMITS
alarm state is cleared by pressing the
RUN
button, or at the start of the next weld.
•
P2 LOW LIMIT
The relay signal will switch when the Control senses that the Pulse 2 energy is
lower than the programmed lower limit. It will start 0 - 150 milliseconds after the end of
HOLD
and will stay energized until the
OUT OF LIMITS
alarm state is cleared by pressing the
RUN
button, or at the start of the next weld.
