Sma SUNNY BOY User Manual download pdf (Page 41)

SMA Solar Technology AG Measurement Channels and Messages

User Manual SB_SMC-BEN092840 41

VpvMax

Vpv-Max

Overvoltage at DC input.

Corrective measures

• Please contact your installer who will immediately disconnect the

PV generator from the inverter! Otherwise, the inverter may be

damaged.

• Have your installer check the plant configuration and the DC

voltage before reconnecting the inverter to the DC voltage.

Uzkposneg<10 Disturbance in the intermediate circuit.

Corrective measures

• Please contact your installer or the SMA Solar Technology

Serviceline if this problem recurs.

UZWK-Max The internal hardware monitor has detected an overvoltage condition in

the intermediate circuit of the inverter.

Corrective measures

• Please contact your installer or the SMA Solar Technology

Serviceline if this problem recurs.

Watchdog

Watchdog-Srr

Internal program run fault.

Corrective measures

• Please contact your installer or the SMA Solar Technology

Serviceline if this problem recurs.

Zac-Bfr

Zac-Srr

The grid impedance is no longer within the permissible range ("Bfr" or

"Srr" is an internal message that has no meaning for the user). For safety

reasons, the inverter disconnects itself from the grid. The impedance is

calculated from the grid impedance and the impedance of the grid

connection cable (AC cable) of the inverter.

Corrective measures

• Please contact your installer to check the grid impedance and the

grid connection at the inverter. Use a cable with sufficiently large

cross-section (= low impedance), as recommended in the

installation guide. It may also be possible to rectify this fault by

tightening the screws of the AC terminals.

• If this fault recurs, please contact the SMA Solar Technology

Serviceline.

Message Description and corrective measure

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Sma SUNNY BOY User Manual Page 41