DOCUMENT: 150919
SECTION 2
SAFETY
PV-15208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2000, Xantrex Technologies Inc./Trace Technologies Corp.
2-2
The terminals of the PV input may be energized if the arrays are energized. In
addition, allow 5 minutes for all capacitors within the enclosure to discharge after
disconnecting the PV-15208 from AC and DC sources.
WARNING
ISOLATION PROCEDURE
The following procedure should be followed to de-energize the PV-15208 for maintenance
:
ANTI ISLAND PROTECTION
A digital phase-shift-loop (PSL) circuit is implemented in the DSP inverter controller to prevent
“Islanding” of the PV-15208.
The DSP continuously makes minor adjustments to the power factor phase angle above and below
unity. In the event of a utility outage, these adjustments destabilize the feedback between the inverter
and the remaining load, resulting in an over/under frequency or voltage condition. The PV-15208
then performs an orderly shutdown. The fault condition will remain until the utility voltage and
frequency have returned to normal for 5 minutes.
This method has been extensively tested and proven to exceed the requirements of UL 1741.
system ground must be routed through CT1 on the main control board (see section 3, installa-
tion and section 7, system schematic for further detail). Upon detection of 1.5 amps of ground
fault current, the PV-15208 executes an orderly shutdown, and annunciates a ground fault at the
operator interface. The PV-15208 will remain faulted until the ground fault is remedied and
cleared at the operator interface (see section 5, troubleshooting).
1. Turn the on/off switch to the off position.
2. Open the PV array disconnect switch (if present).
3. Open the AC interface disconnect (if present).
4. Open the isolation transformer circuit breaker.
5. Install lockout devices on the isolation transformer circuit breaker and PV disconnect switch (if
present).