CHAPTER 2: GETTING STARTED
DUAL PULSE 125
STORED ENERGY RESISTANCE WELDING POWER SUPPLY
990-270 2-5
Do not use lubrication on the input air line because as the internal seals on the air cylinder wear,
lubricating oil will leak past these seals and contaminate the electrode and workpiece with a fine oil
mist. Lubricators are only to be used in automated applications, since excess oil can blow-by worn seals
in the air cylinder and be deposited on the workpieces. Once every six months or every 1 million
operations, whichever occurs first, remove the top flow control valve and place two drops of light
machine oil into the top of the air cylinder.
Air Valve Driver
Connect the plug on the Air Valve (Solenoid) to the Air Valve Driver receptacle located on the rear
panel of the power supply. The Air Valve connector is designed to accept the 4-pin 24/115 VAC plug
provided on Miyachi Unitek Weld Heads. When the connector is plugged in, the power supply will
automatically recognize that an Air Head has been connected.
Miyachi Unitek Air Actuated Weld Heads with standard 3-prong, 115 volt plugs (NEMA 5-15P) require
an adapter, Miyachi Unitek Model VDAC, Valve Driver Adapter Cable.
Miyachi Unitek Air Actuated Weld Heads with 4-pin 24 volt plugs manufactured prior to 1991, require
a jumper connection. Pin 4 must be jumpered to Pin 2 so that the 125DP can recognize that an Air Head
is connected. Refer to Appendix A - Specifications.
Users of Air Actuated Weld Heads which are not manufactured by Amada Miyachi America should
connect the air solenoid valve on the head, or regulator valve assembly, to the appropriate 24 volt or 115
volt pins of the receptacle on the rear of the 125DP. See Appendix A – Specifications.
Footswitch
Connect either a 1-Level or 2-Level Footswitch to the FOOTSWITCH Receptacle located on the rear
panel. The power supply will automatically recognize which type Miyachi Unitek Footswitch has been
connected.
1-Level Footswitch
The 1-Level Footswitch should be fully depressed by the operator. When the Footswitch closes, the
power supply will energize the Air Valve on the weld head and the upper electrode will close and
apply force to the workpiece. If the Footswitch is released before the weld head applies the Preset
Firing Force, the power supply will remove the voltage from the Air Valve and the upper electrode
will return to the open position.
If the Footswitch Weld Abort Option has been set ON, the welding sequence will be terminated if
the Footswitch is released before the welding sequence is completed.
If the Footswitch Weld Abort Option has been set OFF, the welding sequence will continue to its
conclusion, regardless of the position of the Footswitch, once the Preset Firing Force has been
applied to the workpiece by the upper electrode of the weld head.
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