Vitronics Soltec MR933/MR1243 Frequency Inverters

Vitronics Soltec MR933/MR1243 Frequency Inverters (Original + Replacement)

MR933 (Zone 9) and MR1243 (Zone 12) reflow soldered frequency inverters are mainly used for conveyor speed control, hot air motor speed control, and cooling fan speed control. Original equipment manufacturers (OEMs) primarily use Siemens MM420/440 and Delta VFD-M models, corresponding to dedicated 7-C series part numbers.

Original Core Part Numbers (7-C Series, ITW Vitronics)

Conveyor Chain Main Inverter (Most Common, Controls Main Drive Motor)

7-C400180 / C400180: MR933/MR1243 Standard Conveyor Inverter, Siemens MM420 2.2kW 380V (6SE6420-2AD22-2BA1)

7-C400181 / C400181: High Power / Double Rail Version, Siemens MM440 3.0kW 380V (6SE6440-2AD23-0BA1)

Hot Air Motor / Cooling Fan Inverter (Zone Speed ​​Control)

7-C400182 / C400182: Single Zone Hot Air / Fan, Delta VFD007M43B 0.75kW 380V

7-C400183 / C400183: Dual-zone / High air volume, Delta VFD015M43B 1.5kW 380V
Original Part Number | Corresponding Brand/Model | Power | Voltage | Application

7-C400180 | Siemens MM420 6SE6420-2AD22-2BA1 | 2.2kW 380V 3PH | Main conveyor chain

7-C400181 | Siemens MM440 6SE6440-2AD23-0BA1 | 3.0kW 380V 3PH | Dual-rail / Heavy-duty conveyor

7-C400182 | Delta VFD007M43B | 0.75kW 380V 3PH | Hot air motor / Cooling fan

7-C400183 | Delta VFD015M43B | 1.5kW 380V 3PH | Multi-zone hot air / Large Fan Key Specifications and Parameters (General)
Input: 380-480V AC three-phase, 50/60Hz
Control Signal: 0-10V analog speed regulation, Modbus RTU, terminal start/stop (matching the furnace main control A42 board)
Protection: IP20, suitable for high-temperature environments in control cabinets (0-50℃)
Compatible Motor: Three-phase asynchronous motor, 0.75-3.0kW, 1400rpm
Communication: Supports linkage with Vitronics Integra main control board, speed closed loop, fault alarm

Replacement and Setting Points (Required)
Purpose Confirmation: Differentiate between main conveyor inverter and hot air/fan inverter; power ratings cannot be mixed.
Wiring: Strictly follow the original factory terminal definitions (start/stop, 0-10V speed regulation, fault output, RS485), matching A42. Control Board Signal Parameter Settings (Directly Apply): Upper Limit Frequency: 50Hz, Lower Limit: 5Hz Acceleration/Deceleration Time: 5–10s (Shock Protection) Control Mode: V/F Control, Analog Input (0-10V) Fault Protection: Overcurrent, Overvoltage, Undervoltage, Overheat Alarm Compatibility: MR933/MR1243 universal, directly replaces the same power model, no wiring modification required Common Faults and Replacement Suggestions Faults: No output, overcurrent/undervoltage report, communication abnormality → Prioritize replacing the frequency converter Replacement Preferred Replacement: Siemens MM420 / Delta VFD-M are the most stable, parameters are completely consistent with the original, no debugging required Domestic Replacement: Only suitable for temporary emergency use, long-term recommendation is original brand.