Resistance Welder Safety Options

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RESISTANCE WELDER
SAFETY OPTIONS

Safety Device Sensor for Unitrol Controls
Now a Standard Function for Unitrol Solution Controls

•	Protects against PINCH POINT INJURIES with a fully PASSIVE system
•	Installs on any type of spot welder
•	SAVES MONEY by improving weld Quality

LORS is pleased to offer the new UNITROL SOFT TOUCH welder operator safety option. This patent pending function keeps the electrode force very low until it is safe to apply full welding force. This passive fail safe system has been approved by OSHA in manufacturing plants nationwide.
It is now standard on all 9180 series SOLUTION controls without extra cost. Existing SOLUTION controls can also be upgraded for this SOFT TOUCH function.

HOW IT WORKS: After initiation, electrodes start to close under LOW FORCE. A UNITROL TOUCH SENSOR system decides when the electrodes have closed on or near the metal being welded. If an obstruction is detected prior to closing, the electrodes will go back to the fully opened position. No adjustment of SOFT TOUCH is needed when changing welding force or electrode spacing.
The system is field adjusted (lockable settings) so that force between electrodes for the advance portion of the stroke remains low enough to avoid major injury to the operator’s fingers. For press welders, this will even reduce force between electrodes to considerably less than the dead weight of the ram.

FAIL SAFE SYSTEMS:
If the sensor switch is already closed when the welder is being initiated, the electrode will not even start to move, and the display will show which sensor input is closed at that time.
If the sensor wires from the SOFT TOUCH system have become disconnected or are making poor contact, the electrodes will close under low force and then return after a short field-settable delay (1-99 cycles).

WHAT HARDWARE IS NEEDED: To make this system operate, you will have to add a 5-way externally piloted solenoid valve, a shuttle valve, and a precision pressure regulator system to an existing 4-way externally piloted (or direct acting) solenoid valve. Unitrol offers three kits for easy installation:

HEAVY WEIGHT RAMS: This #9181-34W kit is used on:

•	PRESS WELDERS that have dead weight (with air disconnected from welder) of over 50 pounds. The kit is factory pre-plumbed for fast installation and includes all necessary components and interconnecting tubing.

LIGHT WEIGHT RAMS: This #9181-34Y kit is used on:

•	PRESS WELDERS that have dead weight (with air disconnected from welder) that is less than 50 pounds, or does not drop by it’s own weight.
•	ROCKER ARM WELDERS The kit is factory pre-plumbed for fast installation and includes all necessary components and interconnecting tubing.

LIGHT WEIGHT GRAVITY-DROP RAMS: This #9181-34H kit is used on:

•	PRESS WELDERS that have dead weight (with air disconnected from welder) of less than 50 pounds and drops smoothly by gravity. The kit is factory pre-plumbed for fast installation and includes all necessary components and interconnecting tubing.

REDUNDANT SENSOR: You can also add your own proximity switch or LVD system adjusted to close a switch when the electrodes are less than ¼” apart to the system. The SOLUTION will not turn on the high-pressure valve until both metal is detected and the proximity switch has been closed. This is often useful for applications where the parts being welded are not flat prior to the welding process.

More SOFT TOUCH Information: