SECTION 5
TROUBLESHOOTING
DOCUMENT: 151811
PV-225208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2003, Xantrex Technology Inc.
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: /-15Vdc sources, referenced to analog ground, on the
PCU. There are labeled test points on the PCU circuit board. Note: There are two is15Vdc
power supplies l15Vdc 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 approxi15 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
