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SECTION 2
SAFETY
PV-100208 will remain faulted until the ground fault is remedied and cleared at the operator interface
(see section 5, troubleshooting).
Over/Under Voltage and Frequency
The over/under frequency and voltage detection setpoints have been chosen to be in compliance with
IEEE-929 and UL1741.
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Anti Island Protection
A digital phase-shift-loop (PSL) circuit is implemented in the DSP inverter controller to prevent
"Islanding" of the PV-100208.
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-100208
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.
ISOLATION PROCEDURE
The following procedure should be followed to de-energize the PV-100208 for maintenance:
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-100208 from AC and DC sources.
1. Turn the on/off switch to the off position.
2. Open the PV array disconnect switch.
3. Open the AC interface disconnect switch.
4. Open the isolation transformer circuit breaker.
5. Install lockout devices on the isolation transformer circuit breaker and PV disconnect switch.
DOCUMENT: 151700
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WARNING
PV-100208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2003, Xantrex Technology Inc.
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2-2
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