9. Inverter Settings
To set the voltage at which the inverter restarts after low voltage shut-down. - To prevent rapid fluctuation between shut-down and start up, it is recommended that this value be set at least
Inverter Settings 1. To set output voltage of inverter - This is normally 230 Vac. Possible values 210V ~ 245V. 2. Used to enable/disable the internal ground relay functionality. Connection between N and PE during inverter operation. - The ground relay is useful when an earth-leakage circuit-breaker is part of the installation.
The Voltage Control Techniques for Inverters can be affected either external to the Inverter Control or within it. The Voltage Control Techniques for Inverters can be done in two ways. (a) The variation of dc link voltage can be achieved in many ways.
But at very low frequencies, the dc link voltage may be too low to commutate the inverter. This limits the lowest operating frequency and hence the frequency range.
A combination of a diode rectifier and a dc chopper is used for varying the dc link voltage. Closed loop control in this case changes the time ratio of the chopper. Yet another way is to use a variable ratio transformer which operates at constant frequency, before the diode rectifier. These methods are shown in Fig. 3.97.
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