400 Series

MECHELONIC ENGINEERS’ expertise in the field of Resistance Welding technology has been distilled into a versatile Microprocessor based control to serve the needs of vast majority of users of Resistance Welding Machines.

Features Of Microprocessor Control:

16-digit alphanumeric display to furnish tutorial style guidance to the user. Response, by Yes/No and 0 to 9 keys only, is needed for schedule generation.

Same microprocessor unit with embedded mater software meets the requirements of spot/projection welding, robotised fixture linkups as well as seam/rol-spot welding.

Verification routine for itemized tests on sensor switches solenoids, powerlines, thyristors, water circuits, air pressure switches, etc.
‘Target current’ features to experimentally optimize the weld parameters including tolerance levels combined with provision to raise alarms on encountering errors.

8 different schedule each of 4 to 41 steps storable in memory at any time.

Retention of schedules in memory without power.

Schedules selectable through remote switches as well as from keypad.

Measurements of weld time, weld current during each cycle to decide the range of acceptable quality.

Diagnostic abilities and display messages to automatically report status of power supply, air pressure, electrode condition, safety devices, etc.
Programme lockswitch provision enables prevention of unauthorized tampering and inadvertent change of approved weld schedule.

Display of secondary weld current in Killo Amps and Weld Time in cycles after weld for spot/projection welding.

Optional display of current and heat cycles during seam welding operations.

Optional facility to change welding current ±10% with the help of a remote potentiometer without actually changing the programme.
Job/Batch counting facility.

Non-linear heat interpolating stepper system for current compensation in case of electrode wearout during welding.

Checking of secondary welding transformer for open/short circuit.

Can be connected to any CNC/Robotic Welding System.

Selectable wave shape for weld heat:
Heating duration is arranged for subdivision upto 30 independently settable segments. All segments are adjustable for durations along with current levels (in the range of 20-100%) for starts and ends. Upslope, Downslope and stepping style waveforms are easily programmable. Looping back and oscillating between user selectable stages to give versatility for pulsation welding, seam welding, heating, etc.

Constant Current By Digital Computation:
Built-in zerocrossing detectors, voltage monitors, current sensors and multichannel A/D convertors wok with rapid response software to digitally generate corrected phase delay signals during each half cycle to ensure the best feasible control for consistent weld quality. Measurement of true r.m.s. current to facilitate user-settable tolerance limits and error alarms for every weld. Automatic correction function well from –20% to+15% fluctuations of the supply and any swings out of correctable range raise alarms.

QUICK REPLACEABILITY due to multipin connectors between microprocessor unit and the power thyristor cabinet.

IMMEDIATE JOB ABORT in dangerous situations such as temperature rise, reduction in water flow, etc.