Siemens SINVERT 350 用户手册
Hardware operation
3.2 Operating the inverter
3.2 Operating the inverter
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Maximum Power Point (LED "MPP")
The power which can be generated by a PV system depends on the level of insolation and the
temperature of the PV modules. The inverter control unit is equipped with a "Tracker" which automatically
tracks the MPP (Maximum Power Point) of the PV field in Automatic mode. As soon as the inverter
tracker has found the MPP, the LED "MPP" lights up.
A flashing "MPP" LED indicates throttling of the inverter due to overtemperature of the cooling element.
Standby operation (LED "STANDBY")
The LED "STANDBY" lights up if the power unit of the inverter is switched off, but the control electronics
and control panel are switched on (for example, if the PV field output is not sufficient to compensate for
the losses, or if the inverter has been switched off manually). The AC contactor is open, and the DC
contactors are open, closed or switching between these two states (in order to check whether sufficient
voltage/output is available to start operation).
Automatic mode / Test mode
The LEDs "AUTO" and "TEST" indicate the current operating mode of the inverter.
Line (grid) status (LED "LINE OK")
The inverter is equipped with a monitoring unit for the three-phase AC grid. This can detect grid faults or
failures. If a fault is detected, the inverter shuts the system down to prevent the regeneration of
hazardous voltages to the grid. The LED "LINE OK" indicates that the grid voltage and frequency are
within the programmed limit values.
The power which can be generated by a PV system depends on the level of insolation and the
temperature of the PV modules. The inverter control unit is equipped with a "Tracker" which automatically
tracks the MPP (Maximum Power Point) of the PV field in Automatic mode. As soon as the inverter
tracker has found the MPP, the LED "MPP" lights up.
A flashing "MPP" LED indicates throttling of the inverter due to overtemperature of the cooling element.
Standby operation (LED "STANDBY")
The LED "STANDBY" lights up if the power unit of the inverter is switched off, but the control electronics
and control panel are switched on (for example, if the PV field output is not sufficient to compensate for
the losses, or if the inverter has been switched off manually). The AC contactor is open, and the DC
contactors are open, closed or switching between these two states (in order to check whether sufficient
voltage/output is available to start operation).
Automatic mode / Test mode
The LEDs "AUTO" and "TEST" indicate the current operating mode of the inverter.
Line (grid) status (LED "LINE OK")
The inverter is equipped with a monitoring unit for the three-phase AC grid. This can detect grid faults or
failures. If a fault is detected, the inverter shuts the system down to prevent the regeneration of
hazardous voltages to the grid. The LED "LINE OK" indicates that the grid voltage and frequency are
within the programmed limit values.
3.2.10 Fault display
If malfunctions in the PV installation develop which affect only certain parts of the system and do not
prevent it from regenerating energy to the grid, operation continues and the inverter triggers an alarm. If a
malfunction develops which affects the entire system, the inverter is switched off with a fault message.
The LED "ALARM" flashes to indicate an alarm.
The LED "FAULT" lights up steadily to indicate a fault.
If malfunctions in the PV installation develop which affect only certain parts of the system and do not
prevent it from regenerating energy to the grid, operation continues and the inverter triggers an alarm. If a
malfunction develops which affects the entire system, the inverter is switched off with a fault message.
The LED "ALARM" flashes to indicate an alarm.
The LED "FAULT" lights up steadily to indicate a fault.
3.2.11 Numerical display
In Automatic mode, the output of the whole PV system as a percentage of rated output is shown on the
two-digit display. If the output is more than 99%, a value of "00" is displayed. At the same time, the LED
">100%" lights up in the grid indicator bar.
In Test mode, the two-digit display shows the first two digits of the set DC voltage value (for example, 55
represents a voltage of 550 V DC).
Codes for malfunctions
In the event of a fault or alarm (in Test or Automatic mode), a corresponding code appears on the
display. The meaning of these codes can be found in table 4-1. The code will remain displayed until the
operator resets the alarm or fault by means of the keyswitch.
In Automatic mode, the output of the whole PV system as a percentage of rated output is shown on the
two-digit display. If the output is more than 99%, a value of "00" is displayed. At the same time, the LED
">100%" lights up in the grid indicator bar.
In Test mode, the two-digit display shows the first two digits of the set DC voltage value (for example, 55
represents a voltage of 550 V DC).
Codes for malfunctions
In the event of a fault or alarm (in Test or Automatic mode), a corresponding code appears on the
display. The meaning of these codes can be found in table 4-1. The code will remain displayed until the
operator resets the alarm or fault by means of the keyswitch.