Amada WELD CHECKER MM-400B

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The MM-400B is a Weld Checker designed for stationary resistance welding machines, offering comprehensive measurement and analysis capabilities. It can measure current, voltage, current flow time, force, displacement, external voltage input (max. ±10 V), and external current input (4 to 20 mA), displaying their waveforms for optimal welding quality control.

Function Description:

The device features a 5.7-inch color touch panel for easy setting and menu navigation. It supports ISO17657-compliant measurement, allowing for the calculation of RMS in a whole current flow time, in addition to the conventional arithmetic mean RMS. This requires a dedicated ISO-compliant toroidal coil. The MM-400B offers extensive waveform display capabilities, including a zoom function for free adjustment of X-axis (time) and Y-axis (force/current) spacings, and a cursor measurement function for analyzing specific waveform points. An optimal waveform redisplay (FIT) capability automatically resizes and redisplays waveforms if they move or zoom off-screen.

For models equipped with force/displacement specifications, the MM-400B can simultaneously measure force and welding current during current flow. This is achieved using a welding head with an integrated force sensor or optional current/force sensors (MA-770A/771A). The device allows for storing measured values and waveforms in a USB drive or its built-in flash memory. Measurement data can be managed on a PC via RS-232C, RS-485, or Ethernet communication. It supports various welding machines, including single-phase AC, DC inverter, AC inverter, and transistor welding machines, and offers multilingual support in Japanese, English, Chinese, Korean, German, French, and Spanish.

A key feature is the envelope function, which enables OK/NG judgment by comparing a monitored waveform against an allowable range, providing waveform-based management alongside traditional measured values. It also supports seam current measurement, allowing for up to 5-minute moving measurements of current/voltage in AC welding or voltage in DC welding.

Important Technical Specifications:

Measurement Range (Current):
- 1x sensitivity coil: 0.100 to 200.0 kA across various ranges (2.000 kA, 6.00 kA, 20.00 kA, 60.0 kA, 200.0 kA).
- 10x sensitivity coil: 0.010 to 20.00 kA across various ranges (0.200 kA, 0.600 kA, 2.000 kA, 6.00 kA, 20.00 kA).
Measurement Time (Current):
- ms-AC: 1 to 5000 ms
- CYC-AC: 0.5 to 250.0 CYC (50 Hz), 0.5 to 300.0 CYC (60 Hz)
- CYC-***Hz-AC: 0.5 to 2000.0 CYC (M050: 50 Hz, M500: 500 Hz)
- LONG CYC-AC: 0.5 to 500.0 CYC (50 Hz), 0.5 to 600.0 CYC (60 Hz)
- CYC-DC: 0.5 to 100.0 CYC (50 Hz), 0.5 to 120.0 CYC (60 Hz)
- ms-DC: 1 to 2000 ms
- SHORT ms-DC: 0.50 to 300.00 ms (0.05-ms increment)
Measurement Accuracy (Current/Voltage): ± 1% of full scale (excluding sensor error). Conduction angle: ± 9 degrees.
Measurement Range (Voltage): 6.00 V range (0.30 to 6.00 V), 20.0 V range (1.0 to 20.0 V).
Measurement Accuracy (Force/External Input): ± 3% of full scale (excluding sensor error).
Measurement Accuracy (Displacement): ±15 µm (sensor with 1 µm or less resolution) or ±150 µm (sensor with 1.1 µm or more resolution).
Seam Measurement Time: 5 minutes.
Rated Input Voltage: 100 to 240 V AC (50/60 Hz) or 24 V DC.
Input Voltage Tolerance: 90 to 250 V AC (47 to 63 Hz) or 21.6 to 26.4 V DC.
Power Consumption: 40 W (50 W with printer running).
Outer Dimensions: 266 mm (H) x 172 mm (W) x 288 mm (D) (excluding protrusions).
Mass: Approx. 5 kg (excluding options).
Case Protection: IP20.

Usage Features:

The MM-400B is designed for ease of use with its touch panel interface. Users can select measurement items, set trigger conditions (Current, Auto, Force, External, Displacement (EXT), Force (EXT), External (EXT), Real Time), and define measurement intervals and ranges. The device supports various pulse modes for multi-step welding, including SET PULSE, ALL PULSE (SET), ALL PULSE (NO SET), and NO COOL (2nd step measurement). It allows for setting upper and lower limits for measurement items, enabling automatic OK/NG judgments. The envelope function provides advanced waveform analysis by defining upper and lower limit thresholds based on reference waveforms. Data can be saved to USB memory or internal flash memory, and transferred to a PC for further analysis. The device also includes a built-in printer for immediate output of measured values and waveforms.

Maintenance Features:

The manual provides clear instructions for basic maintenance, including replacing the lithium battery for memory backup and replacing the fuse in case of overvoltage. It emphasizes safety precautions, such as turning off the main power and disconnecting the power cable before any maintenance. Regular calibration is recommended to maintain performance, and this service is conducted at the manufacturer's facility, requiring the MM-400B, toroidal coil, force sensor, and displacement sensor to be sent together. The device also includes error codes and troubleshooting steps to diagnose and resolve common issues, such as system errors, frequency errors, trigger level errors, battery low warnings, schedule errors, envelope errors, internal memory errors, clock errors, external 24V power overload, force sensor errors, printer errors, and USB errors.