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Startup Procedure
Starting up the Sun Tie XR requires several steps. You will need to:
1. Check the PV array DC voltage.
2. Check the AC utility voltage.
3. Start up the Sun Tie by switching on the DC and AC circuit breakers
inside the unit.
4. Reassemble the Sun Tie XR and replace the external covers.
Required Equipment
You will need the following equipment to help you start up the
Sun Tie XR:
❐ AC voltmeter (or multimeter)
❐ DC voltmeter (or multimeter)
❐ Frequency counter (optional)
Checking the PV Array DC Voltage
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 as shown in Figure 3-1. This voltage
must be greater than 50 volts DC for 5 minutes minimum to start the
inverter.
3. Switch on the PVGFP and DC breakers.
WARNING: SHOCK HAZARD
Hazardous voltages present from two sources. Use extreme
caution during startup procedure. Before applying power to the
Sun Tie XR, ensure all AC and DC wiring is correct.
Note:
Some thin film modules (amorphous) may produce open circuit
voltages from 100–120 volts. Crystalline solar modules will produce
open circuit voltages at 75–85 volts (four modules wired in series). An
open circuit voltage of 50 volts or more is required for 5 minutes to start
the inverter. The 5-minute time delay is required by safety standards.