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PV-100208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2003, Xantrex Technology Inc.
DOCUMENT: 151700
4-3
SECTION 4
OPERATION
Current Imbalance Detection
In the event of phase-to-phase current imbalance of greater than 20% between phases, the inverter will
execute an orderly shutdown, and annunciate a fault at the operator interface. See Section 5, Trouble-
shooting, for further information on this fault condition.
DC Overvoltage Detection
In the event of DC voltage greater than 600Vdc, the PV-100208 will execute an orderly shutdown and
annunciate a fault to the operator interface. If DC voltage remains greater than 600Vdc, the PV-100208
may be irreparably damaged. See Section 5, troubleshooting for further information on this fault condi-
tion.
Peak Power Tracking
The PV-100208 control software employs an active PV peak power tracker designed to maintain maxi-
mum power output from the PV array at all times of operation. The peak power voltage point varies
primarily depending upon the temperature of the PV cells. The PV-100208 constantly seeks the opti-
mum voltage and current operating points of the PV array to maintain maximum PV power output.
Upon PV wake-up, the power tracker will increase power while ramping PV array voltage to the PV
maximum power voltage reference setpoint (PPT V Ref). The change rate is governed by the power
point ramp time setpoint (PPT Ramp T). Once the PV voltage is ramped to the reference setpoint, the
PCU begins to adjust the commanded PV voltage around the reference setpoint, seeking maximum PV
power. The power tracker may only adjust the operating v/- 20% of PPT V Ref. The PV
maximum power voltage step and update rate are user setable (PPT V Step and PPT Rate, respec-
tively).
If available PV power is above the maximum allowable power level of the PV-100208, the power
tracker will increase voltage as needed to maintain output power below rated maximum.
The minimum operating voltage of the PV-100208 is 330 VDC. The power tracker will not track
voltage below this point, regardless of the reference voltage setpoint.
Automatic Sleep Test
Toward the end of every solar day, the PV-100208 automatically determines when to stop producing
power dependent upon the output power of the inverter. As the net output power of the PV-100208
nears zero, a timer is started to allow the inverter to ride through any brief irradiance reductions.
OPERATOR INTERFACE
The operator interface display consists of two main menu levels: The read parameter menu and the
write parameter menu. The read parameter menu consists of all system parameters, the date and time.
These can be viewed any time the PV-100208 has control power.
The write parameter menu consists of a goal state sub-menu, and all system write parameters. The write
parameter menu is password protected and may only be changed by trained service technicians. In
particular are parameters relating to utility protection setpoints. These have been set in the factory to