Installation manual

Starting the Commissioning Test
153396 Revision D 5–5
This manual is for use by qualified installers only
Apply DC Voltage
1. Verify both Xantrex GT250 inverter enclosure doors are closed and locked.
2. Close the DC disconnect (S1) switch. This will energize the DC circuits.
3. Look, listen and smell for signs of defects.
4. Record any defects found.
Matrix Test
1. Confirm that the ON/OFF switch (S3) in the OFF position.
2. From the front panel, select matrix test from the goal state menu.
3. Verify that the Xantrex GT250 enters the matrix test mode.
4. In this mode, the Xantrex GT250 will be operating the IGBT matrix without
closing either the AC or DC contactors. If a fault occurs, refer to the
Troubleshooting chapter of your Xantrex GT250 Grid-Tied Photovoltaic
Inverter Operation and Maintenance Manual (Part #: 153395).
5. To stop the test, select goal state from the GUI or front panel and choose
Shutdown.
Operate Inverter
1. Make sure all doors are closed and locked.
2. Using the front panel or the GUI, set the I PPT Max percent to 25%.
3. Place the O
N/OFF switch in the ON position. If the PV voltage is above PV
Start voltage threshold, followed by a 5-minute delay period, the PV
contactors (K2) will close, followed by the main AC contactor (K1).
The inverter will begin to produce power up to 25% of rated power.
4. Look, listen and smell for any defects.
5. Make sure the internal enclosure fans are operating.
6. If everything is okay, increase the I PPT Max until you reach 100%.
7. Check all the operating data with the GUI or front panel. Record any
irregularities.
8. Let the inverter run.
9. Verify the matrix fans operate after the matrix temperature reaches at least
30°C, and the "INV kW" is at least 50 kW.
Functional Test
The functional test can be run at any convenient power level.
1. Disconnect all ungrounded phases from the grid simultaneously using the
external disconnect on either the primary or secondary of the isolation
transformer.
2. Verify that the inverter ceases to energize its output terminals. After a
convenient period, reclose the disconnect.
3. Verify that the inverter does not reenergize its output terminals for the
required reconnect time delay. The default value is five minutes minimum.