SECTION 5
TROUBLESHOOTING
DOCUMENT: 151710
PV-45208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2002, Xantrex Technology Inc.
5-4
This fault is auto-resetting. The unit will automatically restart after line has stabilized within normal
limits for 5 minutes. Frequency setpoints may be modified via the operator interface program. Utility
protection setpoints may only be adjusted by trained personnel with approval by both the local utility
and the equipment owner.
(5) AC Line Over Frequency Fault (0x0800)
The AC frequency exceeded the maximum-programmed limit. This limit is set to 60.5 Hz and the system
response time limit is set to less than 0.1 seconds to insure the PV-45208 disconnects from the utility
within the time allowed by UL1741.
Possible causes:
•
The utility frequency exceeded the allowable limit (60.5 Hz by default). Verify the utility frequency
is stable and within allowable operating limits.
•
There is a problem with one or more of the AC sense wires (see system schematic in Section 7).
This fault is auto-resetting. The unit will automatically restart after line has stabilized within normal
limits for 5 minutes.
(6) Ground Current Fault (0x8000)
The earth safety ground current has exceeded the maximum-programmed value.
Possible causes:
•
The negative wire from the PV array has been passed through CT1. Verify PV ground jumper is
installed between TBDC- and TBNEUT.
•
Inspect the PV array for actual ground faults.
•
The PV array has been grounded in more than one location. If the PV array is grounded through
CT1, it must not be grounded at any other location.
•
CT1 defective: Contact your Xantrex Technology distributor for assistance or service.
(7) DC Bus Over Voltage Fault (0x0020)
The DC bus voltage has exceeded the maximum limit.
This is also the PV input voltage sense point. Check the PV input voltage at the PV disconnect switch.
If the voltage is below 600 VDC and agrees with the voltage displayed on the LCD, cycle the on/off
switch and restart the PV-45208.
Possible causes:
•
The PV array open circuit voltage exceeded 600 VDC.
•
There is a problem with the PV voltage sense wiring (see system schematic in Section 7).
(8) CT Offset Fault
(0x80000)
Upon system startup, the PV-45208 has determined that the CT offset current is too large to be cali-
brated. This is caused by the control system detecting current, when no current is commanded.
•
Observe individual phase currents with the operator interface program. Generally, a CT offset fault
with show high currents on one phase while the system is in Standby, with zero actual current being
