Parker Products WCS-SIF-01 manual Ansi 2 Ported Cylinder Option Ansi 4 Ported Cylinder Option

WCS-SIF-01 Training & Maintenance Manual

Description & Operation

General Operation of

Spotwelding Units – 2 and 4 ported guns

Spotwelding systems control both retract (pre-stroke) and weld stroke motions. When a 4 ported cylinder is used, the control block functions as follows:

1. The retract (pre-stroke) valve is energized, allowing

the weld cylinder to extend under full line pressure and

moving to its predetermined position prior to welding.

2. The weld stroke valve is then energized using a selected

weld schedule pressure. The closure speed of the weld

tips is controlled by the use of an adjustable flow control,

thus creating “low impact”.

3. Immediately following weld tip contact with the sheet

metal, two actions take place.

a. The proportional / quick dump valve that senses

pressure allows the front end of the cylinder to exhaust

(by-passing the flow control), providing weld schedule

pressure instantly.

Front View	Weld Stroke	Flow
	Valve	Control

Retract

(Pre-Stroke)

Valve

(4 Ported Gun Only)

Feedback

Sensor

Weld Stroke

b. The proportional / quick dump valve also actuates a

feedback sensor to start the weld cycle.

4. Once the weld cycle is complete, the weld stroke valve is de-

Back View

Valve

energized, allowing the weld tips to open under full pressure.

5. The retract (pre-stroke) valve is then de-energized, allowing

the weld cylinder to open completely under full line pressure.

Note: Dual pressure is provided to the control block. Line (high) pressure is used for both retract stroke and weld stroke open. Weld schedule pressure is used for weld stroke close. Dual pressure provides for weld tips to be closed for tip dressing using any pressures available, from as low as

5 PSIG to maximum line pressure. 2 ported guns perform the same steps as above, except that the retract (pre-stroke) portion of the cylinder does not exist. Steps 2–4 only apply.

Retract

(Pre-Stroke)

Valve

(4 Ported Gun Only)

ANSI (2 Ported Cylinder Option) ANSI (4 Ported Cylinder Option)

Inductive Sensor / Connection: Turck Connection Diagram Inductive Sensor

1	Brown	+4 VDC Power Supply
3	Blue	0 V Power Supply
4	Black	Switch Wire	+	-
			1	3	4

pnp

Inductive Sensor / Connection: Turck

Connection Diagram Inductive Sensor

1	Brown		+4 VDC Power Supply
3	Blue		0 V Power Supply
4	Black		Switch Wire
		+			-
				1	3	4
						pnp

Pr

W+

PwW-

Pr	R-
	R+

Pw

W+

W-

Pneumatic

Parker Hannifin Corporation Pneumatic Division Richland, Michigan www.parker.com/pneumatics