Xantrex Technology PV-30208 - Manual (Page 7)

DOCUMENT: 151315
SECTION 2
SAFETY
PV-30208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2003, Xantrex Technology Inc.
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-30208 from AC and DC sources.
WARNING
ISOLATION PROCEDURE
Anti Island Protection
A digital phase-shift-loop (PSL) circuit is implemented in the DSP inverter controller to prevent
“Islanding” of the PV-30208.
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-30208
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 UL1741.
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).
The following procedure should be followed to de-energize the PV-30208 for maintenance :