Checking The Pv Array Dc Voltage; Checking The Ac Utility Voltage; Replacing The Wiring/Disconnect Box Cover - Xantrex GT5.0-NA-240 Owner's Manual

Starting the Inverter

Checking the PV Array DC Voltage

Checking the AC Utility Voltage

Replacing the Wiring/Disconnect Box Cover

4–2
To check the PV array DC voltage:
1. Uncover the PV arrays and expose them to full sunlight. The sunlight must be
intense enough to produce the required output voltage.
2. Measure the PV array open circuit DC voltage across the DC positive (+) and
negative (–) terminals. This voltage must be greater than 150 volts DC (to
energize the electronics) and less than 600 volts DC (to prevent damage to the
inverter).
To check the AC utility voltage:
1. Switch on the main and inverter breakers in the main electrical service panel.
2. Using an AC voltmeter, measure the AC open circuit utility voltage between
L1 and L2. Ensure this voltage is at approximately the nominal value. The
inverter operates with a line-to-line voltage (L1 to L2) range around the
nominal value.
3. Measure the phase-to-neutral voltage. Phase-to-neutral voltage should be
120 Vac (nominal) for each phase-to-neutral measurement, whether the grid is
120/240 V split-phase or 208 V three-phase WYE.
Phase-to-phase voltage may rise 3 to 4 Vac (at the field wiring points, depending
upon grid impedance) when current is flowing to a typical 240 V grid. If the grid
voltage is within 1 to 2 Vac of the high voltage disconnect threshold when the
inverter is at full rated power output (see "Adjustable Voltage, Frequency and
Reconnection Settings" on page A–10), the inverter may disconnect more
frequently than it normally should. If the grid is normally high, the unit may
disconnect and then refuse to reconnect due to the required reconnect voltage of
106 per cent of nominal.
If this occurs, consult the utility about reducing the utility voltage or to get
permission to allow the installer to adjust the disconnect threshold to gain
additional margin.
See "Electrical Specifications", "Output" on page A–2 for the utility voltage
operating range for your GT Inverter model.
After performing the voltage checks, replace all covers that were removed during
installation and startup.
WARNING: Shock hazard
Before reattaching covers, turn OFF the breaker switches in the main utility service panel
and the DC/AC Disconnect switch on the GT Inverter.
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