CHAPTER 1: DESCRIPTION
UB25 LINEAR DC RESISTANCE WELDING CONTROL
990-665
1-13
Section V. Emergency Stop Switch and 24V Jumpers
The Power Supply is shipped with two 25-pin mating plugs installed on the two I/O connectors on the rear
panel of the Power Supply. These two plugs, connected to
I/O Connector A
and
I/O Connector B
are
pre-wired with two jumpers for the
24 V Power
signals and a shorted two-wire lead for the
Emergency
Stop Switch
connection. For connector pin identification and specifications, including the 24 V Power
signals, see
Appendix B, Electrical and Data Connectors.
NOTE:
The Power Supply will not function if these plugs are not installed.
The plug connected to
I/O Connector A
is pre-wired with a two-wire lead for the
Emergency Stop Switch
.
The lead wires are shorted together [normally closed] and secured with a wire nut.
Emergency Stop Switch Shorting Wires
NOTE:
For clarity, the tag attached to the shorting wires containing instructions in several languages
is not shown here. The tag (with the complete text) is shown in
Appendix B, Electrical and Data
Connectors.
You may operate the Power Supply with or without an Operator Emergency Stop Switch. For operation
without
an Emergency Stop Switch, leave the two wires of the emergency stop lead shorted together
(closing the circuit).
To operate
with
an Emergency Stop Switch, connect a normally closed, emergency stop switch across the
two wires of the emergency stop lead. This switch, when actuated (opening the circuit), will immediately
stop the weld cycle and retract the weld head. This emergency stop does not require the intervention of
the microprocessor.
To restart the Power Supply after an emergency stop, press the
RUN
key on the front panel. Verify that
the desired schedule is still displayed on the front panel, and then resume welding.
For user convenience, pins 9 and 13 of
I/O Connector B
have an additional input to stop the functioning
of the unit. This input will stop weld current and raise the weld head. This input requires the
microprocessor to be operational and is not the emergency stop for the unit.
