A/C Inverter Testing Instrument

ZM IPC307 functions to identify inverter faults when a problem arises such as compressor over-current protection and shut down. It senses and measures valid switching operation of the 6 output transistors in inverter systems. A sequence in which all 6 transistors switch both on and off, is indicative of correct operation. The IPC is connected to the inverter instead of the compressor and automatically monitors the inverter output. The inverter uses a rectifier to convert the incoming alternating current (AC) to direct current (DC) and then switches the 6 transistors in a sequence to produce AC of a desired frequency. The variable frequency AC drives the compressor. When an inverter system starts up - It is common for there to be a delay of typically two to three minutes before the output is enabled and the duration of the output switching sequence that follows, may only last for a second or more. The sequence is terminated once the inverter senses there is no compressor loading. In some cases the phase sequence might be repeated following a further delay. Also, following a fault, some systems will require a resetting action of some kind.