2.2 UVT failure

UVT is undervoltage fault , I believe that many customers still in use will encounter this problem, our common undervoltage detection point is the DC bus voltage side , after the high-value resistor divider sampling a low voltage, and after comparing the standard voltage signal output voltage is normal , overvoltage or undervoltage signal signal . For samples Mitsubishi A500 series inverter voltage signal is obtained from the switching power supply side , and after optocoupler isolation , in our repair process, the discovery of the damage caused optocoupler undervoltage fault occupies a very large proportion of this phenomenon in the previous inverter repair or rare .

2.3 E6, E7 failure

E6, E7 failure for the majority of users are no strangers , this is a relatively common Mitsubishi inverter typical fault , of course, also the many causes of damage .

( 1 ) IC 1302H02 damage. This is a drive waveform converting integrated and multi-channel detection signal in one of the integrated circuit IC , and a number of associated signal path and the CPU board , in many cases , any one signal problems are likely to cause this IC E6 , E7 alarm ;

( 2 ) signal isolation optocoupler damage. IC IC 1302H02 between the CPU board and how the strength of the signal path needs in isolation optocoupler damage in the proportion of damaged components is relatively high , so in the event of E6, E7 alarm, also taking into account whether it is caused by such factors ;

( 3 ) damage to the connector or connector poor contact. Since the CPU board and the power cable is connected between the plates after a few bent prone to breakage , Weld and other phenomena, if used improperly in the plug side pins are also prone to bending and breaking phenomenon . Some of the above reasons there are also likely to cause E6, E7 failure.

2.4 Switching power supply damage

Troubleshooting is also damaged A500 series switching power inverter , we often exclude previously mentioned external pulse transformer is damaged, switch FET is damaged, start -up resistor is damaged , the rectifier diodes and some other factors damage , damage to the device is a common M51996 waveform generator chip , which is a variety of protection in one piece with the control chip turn-off time adjustment , output voltage regulation , voltage feedback regulation . More prone to problems where the main power supply chip 14 feet , 7 feet to adjust the voltage reference value, the feedback detection of 5 feet and 2 feet and other waveform output .

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