Cracks on pressed products are usually inspected with visual checking by operators after press working. As it is an inspection after press working, once finding a defect means that there may be a dozen of Failed products. Moreover, since huge volumes of visual checking waste a lot of labors and time, that might cause overlook of Failed product. The overlook of Failed product seriously affects product in quality afterward so that cracks must be detected during press working in order to prevent it from being brought out to next process. Therefore the VC-3200 detects abnormal vibration when cracks occur and makes Pass/Fail determination, it improves working efficiency and prevents cracked products from being brought out to next process.
 

The VC-3200 can be setup three frequency bands and make Pass/Fail determination based on rms, peak on each band or power averaging calculated value (same for all bands). Also it has effective functions such as comparator delay time setup function and auto operation function. Comparator delay time setup function removes unwanted signal at the time of starting measurement and automatic operation function can control a timing of determination by inputting a control signal from external device such as PLC*. Although the VC-3200 can be operated by 24VDC (22 to 26VDC) as standard, you have an alternative to use it at 100 VAC by connecting an optional AC/DC convertor VC-0352.
 

The NP-3331N20 accelerometer is fixed on a table of pressing machine by screw.
 

Connecting the VC-3200 to a PC via RS-232C interface enables storing measured data and so on.
 

By connecting a pair of commercially sold headphones to the VC-3200, it is possible to make hearing check of vibrating sound. Moreover, it can be used instead of conventional stethoscopic probe. Output signals are provided for each band, enabling an observation for vibration phenomenon on each frequency band separately.