BillK-AZ
Senior Member
- Location
- Mesa Arizona
I have two systems using SYMO inverters on 120/208V 3Ph, each with DataManager 2 cards for remote monitoring via ModBus.
The Fronius pictorial installation guide indicates AC on first, then DC for start-up.
The ModBus requires a DataManager2 firmware update and that required a reboot. System #1 has the SYMO inverters high under a carport, AC disconnect at ground level. Update worked correctly.
System #2 has both at ground level, a step apart. After updating DataManager2 firmware, the reboot produced a consistent Error - 102 (AC voltage too high), but AC voltage was well within the range. A call to Fronius support - they suggested removing the DataManager2 card and trying again. Same problem. Went through the sequence slowly, measuring the AC line-line and Line-N, then turning on the DC and the inverter started properly? It seemed that simply measuring the voltage corrected the problem.
Turns out that a delay is needed. If the DC switch is not closed until the LCD display indicates low PV voltage (about 30 seconds), there is no error. System #1 was not a problem due to the time to climb the ladder. However, with an utility outage and PV on, there is no problem.
The Fronius pictorial installation guide indicates AC on first, then DC for start-up.
The ModBus requires a DataManager2 firmware update and that required a reboot. System #1 has the SYMO inverters high under a carport, AC disconnect at ground level. Update worked correctly.
System #2 has both at ground level, a step apart. After updating DataManager2 firmware, the reboot produced a consistent Error - 102 (AC voltage too high), but AC voltage was well within the range. A call to Fronius support - they suggested removing the DataManager2 card and trying again. Same problem. Went through the sequence slowly, measuring the AC line-line and Line-N, then turning on the DC and the inverter started properly? It seemed that simply measuring the voltage corrected the problem.
Turns out that a delay is needed. If the DC switch is not closed until the LCD display indicates low PV voltage (about 30 seconds), there is no error. System #1 was not a problem due to the time to climb the ladder. However, with an utility outage and PV on, there is no problem.