Inverter Module Installation and Operation
Operation of Inverter Module
Theory of Operation
The XDI is a digitally controlled power converter. It provides galvanic isolation from the DC input to the AC output. The isolation stage is a resonant full-bridge converter and the inversion stage is a highly efficient class D amplifier (patent pending).
Depending on the rack wiring, inverters can operate in stand-alone, parallel, 3-phase or split-phase mode. Details on rack wiring are in Chapter 2.
When paralleled there is no master unit and each unit adjusts its own power level for best power sharing.
The user interface lines and the optional Ethernet provide a convenient way to remotely control and monitor the status of each Inverter in the rack.
All user lines (see Figure 2-3) as well as communication lines between the units (CANbus and synchro lines - see Figure 2-3) are isolated from the input DC and output AC power potential.
System Startup
Turn the front panel switch (see Figure 3-2) to the ON position to enable the inverter.
At power-on, the unit enters into a self-diagnostic mode to check that the inverter is functioning correctly and no alarm conditions exist. During this short delay (about 10 seconds), the “Standby/ON” Indicator (see Figure 3-2) will flash green. Once the unit has completed its self- diagnosis and everything is functioning correctly, by default the inverter output will turn on. The “Standby/ON” indicator will remain solid green and he power will be delivered to the output AC terminals (see Figure 2- 3).