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Startup Procedure
975-0053-01-01 3–3
Checking the AC Utility Voltage
To check the AC utility voltage:
1. Switch on the main 240 V breakers in the building’s electrical service
panel.
2. Ensure all circuit breakers located in the Sun Tie XR unit are in the
off (down) position.
3. Using an AC voltmeter, measure the AC open circuit utility voltage
between L1 and L2, as shown in Figure 3-2. Ensure this voltage is
approximately 240 volts AC. The inverter operates with a line-to-line
voltage (L1 to L2) ranging from 211–264 volts AC.
4. Switch on the ganged 15 amp Sun Tie XR circuit breakers located in
the main electrical service panel. This applies the utility-supplied
240 volts AC to the Sun Tie XR unit.
Figure 3-1 PV array DC voltage test
Note:
The Sun Tie XR is designed primarily for residential
applications. For commercial applications where only 208 VAC is
available, the Sun Tie XR may be installed with the appropriate use of a
buck-boost transformer.
> 50 VDC
AC
VOLTS
DC
VOLTS
+
–