Xantrex Technology PV-225208

SECTION 5

TROUBLESHOOTING

DOCUMENT: 151811 PV-225208 Photovoltaic Inverter

Operation and Maintenance Manual

5-4

The dry contact auxiliary switch mounted to the PV disconnect switch has been toggled. The auxiliary

switch should be opened when the PV disconnect switch is open. If the fault will not clear when the PV

disconnect switch is closed:

• Isolate PV-225208 from utility power.

•Close PV disconnect switch and check continuity between PCU J3-3 and PCU J2-7. If there is no

continuity, inspect wiring between the PCU and the auxiliary switch (see page 2 of the system schematic

for further detail).

XX25/XX26 - Line Gate Drive Fault (S)

One of the IGBT gate drive boards signaled the PCU that there was a fault. The second two digits refer to

which matrix has the fault. XX25 refers to matrix 1 and XX26 refers to matrix 2. The particular device at

which the fault was detected is indicated by the first two digits of the fault code, as follows:

XX: 01 = Phase A+ 02 = Phase A-

04 = Phase B+ 08 = Phase B-

10 = Phase C+ 20 = Phase C-

If more than one phase faults simultaneously, the error code will contain the summation of phase fault

values. For example, if phase A+ and B+ of matrix 1 fault simultaneously, the error will read 0525.

Make sure the fiber optics for the device and matrix in question are properly connected to the driver

board. Similarly, make sure the fiber is properly connected at the PCU.

Clear the fault and restart the PV-225208. If the fault is sustained, contact your Xantrex Technology distributor

for assistance or service.

YY27/YY28 - Line Over-Current Fault (S)

Current in one phase of the matrix has exceeded the allowable limit. YY27 refers to matrix 1 and YY28 refers

to matrix2. The faulted phase is indicated by the first two digits of the fault code, as follows:

YY: 01 = Phase A

02 = Phase B

04 = Phase C

If more than one phase faults simultaneously, the error code will contain the summation of phase fault

values. For example, if phase A and C of matrix 1 fault simultaneously, the error will read 0527.

Possible causes:

•AC system wiring short: Inspect the AC power system for short circuits.

•PCU Power Supply is defective: Verify +/-15Vdc sources, referenced to analog ground, on the

PCU. There are labeled test points on the PCU circuit board. Note: There are two isolated +15Vdc

power supplies labeled +15Vdc and +15Vdc Drv. The +15Vdc Drv power supply provides power

for the matrix driver boards only.

•Faulty CT wiring: Verify the wiring between the PCU power supply and the CT is properly con-

nected and undamaged. Refer to page 2 of the system schematic in Section 7.

•CT defective: Locate the current transducer for the matrix and phase in question (see control com-

ponents drawing in Section 7). With a digital multi-meter measure the voltage from CT pins 1, 2, and

3 to chassis ground. Pins 1 and 3 should read approximately +15 and -15Vdc respectively. These

voltages are sourced directly from the PCU. Pin 2 should read less than 20mV when no current is

passing through the CT window. If Pin 2 reads greater than 20mV, and the supply voltages are on