Tweco Hefty II CC CV Voltage Sensing Wire feeder - Manual (Page 15)

Features/Benefits:
1. Operates On Arc Voltage A. Can be used with most constant current (CC) or con-
stant voltage (CV) DC-type power sources
B. No control cables required
2. Voltage Sensing Control Circuit With
CC/CV Switch
A. Allows voltage sensing wire feed speed operation when
used with CC power sources
B. Allows constant wire feed speed operation when used
with CV power sources
3. Solid State Circuitry A. Improves wire speed accuracy
B. Compensates for motor load variations
C. Provides current limit to contactor, gas valve, and motor
4. Polarity Insensitive A. Operates on either straight or reverse polarity
5. Electronic Controlled Start Circuit A. Enhances arc starting performance with CC power
sources
6. Electronic Brake A. Solid state control of an electronic brake offers quick
stopping of the motor to prevent wire overrun
7. Standard Contactor A. Allows the welding wire to remain electrically “cold” until
the gun switch trigger is depressed
B. Increases operator safety
8. Standard Gas Valve A. Controls the “on/off” flow of shielding gas
9. Powerful, Permanent Magnet DC Drive
Motor
A. Accommodates the fast speed demands of small diameter
wire
B. Accommodates the low speed, high torque demands of
large diameter wire
10. Replaceable Motor Brushes A. Provides economical means of extending motor life
11. Needle Bearing Construction On Motor
Output Shaft
A. Reduces friction and extends bearing life over a
sleeving bearing
12. Input Circuit Breaker A. Ensures complete system protection
13. Electronic Controlled Protection Circuitry A. Protects electronics from undervoltage, overvoltage,
and voltage spikes.
B. Protects electronics from a shorted or locked motor
C. Protects electronics from a shorted contactor coil
D. Protects electronics from a shorted gas valve coil
14. Stainless Steel Case A. Provides strength in a small, portable, light weight
package
B. Allows easy access for difficult to reach jobs
15. Standard Inch/Purge Switch A. Allows “cold” inching of wire at set wire feed speed
B. Allows purging of gas without running wire
16. Carrying Handle A. Promotes portability
17. Quick Change Feed Rolls A. Allows operator to change feed rolls without the use of
tools
B. Both feed rolls are gear driven for better feeding of wire
18. Gun Clamp Knob A. Allows operator to secure welding gun without the use
of tools
19. Feed Roll Pressure Release A. Allows operator to adjust feed roll pressure without the
use of tools
B. Allows operator to change feed rolls or wire while
retaining preset feed roll pressure
430429-456
DESCRIPTION OF EQUIPMENT
3-2 November 17, 1999