Lincoln Electric IM557 manual Control Features

A-3 INSTALLATION A-3

Crater Fill - Provides crater feed speed adjustment (in 4-step trigger mode) independent of weld, cold inch, or run-in speeds.

Solid-State Overload Protection - No circuit breaker to reset. Front panel display indicates time remaining before automatic reset.

Gas Solenoid Valve - Complete with inlet fittings for easy installation of gas is standard on Synergic 7 models. Also available as an option (K659-1) a Gas Guard regulator for flow surge suppression.

English/Metric Speed Display - Provides front panel selection of speed display in units of IPM or M/M.

4-Roll Drive - Both models employ 4-Roll Drive, with 2 driven rolls, providing optimal feeding force for prob- lem feeding situations, with low wire deformation for improved feeding of soft wires.

Control Features:

Microcomputer Based Control - Provides precise setting and display of all parameters and precision timing functions. Optimizes wire drive control for crisp acceleration and smooth response with precise repeatability. Allows synergic control of various weld- ing processes by communicating information over a serial link to the compatible power source.

Display and Indicator Lights - Wide temperature range, long life, 3-1/2 digit 7-segment LED display with .56” (14.2mm) character height permits easy viewing even from long gun cable distances. Individual red indicator lights are high intensity LED’s for viewing at almost any angle. Mode and Timer func- tion keys and indicator lights are concealed behind a hinged “drop-door” cover.

Encoder Controls - Rotating encoders provide con- tinuous knob control for setting both Wire Feed Speed and Volts/Trim procedures.

Procedure Switch - Permits selection of A or B pro- cedures, as set by the procedure controls and memo- ry pair selected at the Power Wave power source. Setting switch to center “Gun Switch” position allows selection of A or B procedures with the optional Dual Procedure Switch.

Keypad - Consists of 7 membrane keys with tactile- feel embossed domes. All keys are generously spaced to provide easy selection, even if wearing welding gloves.

2-Step or 4-Step Trigger Modes - Unit operates only when trigger is pressed in 2-Step mode (normal) oper- ation. 4-Step Trigger Mode eliminates the need to hold the gun trigger closed while welding. Both mod- els have user selectable 4-step with crater fill, or as shipped, 4-step with current interlock.

Gas Preflow and Postflow Timers - Allows setting of shielding gas preflow time (0-2.5 seconds) before welding arc starts, and gas postflow time (0-9.9 seconds), after welding arc stops.

Crater Fill - Allows setting of crater fill WFS (when 4- step with crater fill trigger mode is selected), indepen- dent of weld, cold feed, and run-in speeds.

Selectable Burnback Time - Provides front panel selection of 6 Burnback times. This feature provides selectable Burnback time (default = 0ms) if required to prevent electrode from sticking in weld puddle at finish of weld.

Spot Mode - Allows a single timed weld cycle each time the gun trigger is held closed. Duration (0.2-9.9 seconds) is set by the Spot ON timer.

Digital “Memory” Voltmeter - Displays arc voltage from 0 to 80V DC, when welding gun trigger is activat- ed, with automatic polarity indication for positive or negative electrode. The last welding voltage moni- tored at end of weld is displayed for 5 seconds after weld has stopped. This allows checking actual volt- age after weld has stopped.

Digital “Memory” Ammeter - Weld Feed Speed (WFS) display may be selectable to display welding amps only while welding and the last welding amps monitored at the end of the weld will be displayed for 5 seconds after the weld has stopped. This allows checking actual weld current after the weld has stopped.

Power-down Save - All settings, including mode, Run-in speed, cold feed speed, crater speed, weld speed, timers, English-Metric units and acceleration are automatically saved when power is removed. This feature does not require batteries and when power is restored it will automatically return all settings to the state they were in when power was removed. However, the power source may overwrite any or all of these parameters after Power-Up Recall is com- plete.

SYNERGIC 7 & 7H