Operation

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)

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.

Checking the PV Array DC VoltageTo 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.

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.

3. Switch on the PVGFP and DC breakers.

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