Standard weld timings, squeeze, weld hold and off, only weld time is synchronous.

Simple to use due to knobs, no skill required.

Works with voltage compensation mode only.

Low cost & restricted to spot welding only.

Used mostly for tack welding and low cost application where weld strength is not critical.

Modular construction

All timers are synchronous with mains frequency.

Accurate weld timing.

Simple interface as settings through knobs.

Works with Voltage compensation mode.

Can be used with all type of machines.

Due to modular nature different configurations available with a number of heat control circuits.

Used mainly with SPMS

16 Digit LED/LCD display with keypad for programming of weld schedules.

Programming of a number of weld schedules, recallable remotely as well as from keypad.

Weld current measurement and display.

Controller works in Current feedback mode & voltage compensation mode.

Password protection facility, to lock the program schedules.

Monitoring of the inputs voltage and weld current.

Direct inputs/outputs for motor starter and index for simple automation of machine without the requirement of PLC.

Balanced load on all three phases.

Lesser inductive losses in the secondary circuit.

Near unity power factor.

Reduced installation cost.

Smaller size transformers as compared to AC controller.

Faster and more accurate welding.

Balanced load on all three phases.

Near unity power factor.

Reduced installation cost.

Uses standard AC transformer.

Faster and more accurate welding, due to higher frequency PWM controlling.

Cheaper than MFDC but more than that of AC controller.