iPAK2 User Guide
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13. Tutorials
This section is a series of application notes which discuss some specific topics in detail.
13.1. Controlling an Air over Oil system
An ‘Air over Oil’ system (also referred to as OHMA) uses compressed air to open and close the
electrodes plus a hydraulic intensifier to apply the weld force. This type of system can easily be
controlled by the iPAK2 by making use of the programmable AUX valves feature.
1. Connect the air solenoid (ADVANCE) to the AV1(SV1) output (or whichever output you
have programmed to provide the WAV function).
2. Connect the hydraulic solenoid (INTENSIFY) to the AV2(SV2) output (or whichever AUX
output you wish to use).
3. In your welding schedule(s), set the Presqueeze time to suit the gun closure, and the
Squeeze time to apply the force pre-weld. Now program the AUX valve chosen in step
2 to come on during all of the intervals which you are using (e.g. Squeeze, Main heat,
Hold).
START
ADVANCE
INTENSIFY
CURRENT
Presqueeze Squeeze Mainheat Hold
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