Technical Description; Technical Confi Guration Solarmax 2000S/3000S; Technical Confi Guration Solarmax 4200S/6000S; Safety Functions - Sputnik Engineering SolarMax 2000S Documentación Del Dispositivo

8 Technical description

A simple and robust design is typical for the SolarMax power unit.
8.1 Technical confi guration SolarMax 2000S/3000S
The DC voltage of the solar generator is transferred to a DC bus voltage via a low-
loss step-up converter (DC/DC converter). The IGBT bridge circuit generates the
sinusoidal infeed current.
U Fault current
DC
EMC
and earth-fault
filter
monitoring
U
DC
Graphics display Control unit with digital signal processor (DSP)
Block diagram SolarMax 2000S/3000S
8.2 Technical confi guration SolarMax 4200S/6000S
The DC voltage of the solar generator is transferred to a DC bus voltage via a low-
loss step-up converter (DC/DC converter). The IGBT bridge circuit generates the
sinusoidal infeed current.
The innovative MaxShare concept used in the SolarMax 6000C for the fi rst time
leads to a signifi cant increase in effi ciency in the partial load range. MaxShare
switches the required power stages on or off according to the current output:
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Step-up converter Bridge circuit Mains relay
U
DC
EMC
Filter
U
DC
Graphics display
EMC
Block diagram SolarMax 4200S/6000S
filter

8.3 Safety functions

In order to ensure a high safety standard, SolarMax inverters feature integrated fault
current monitoring on the DC side.
PC interface
In the event of an earth fault current, the fault current monitoring system detects the
differential current and interrupts the mains operation. In the event of accidental con-
tact, the fault current monitoring system triggers a safety mechanism that switches
the device off, thereby preventing electric shock.

8.4 Control functions

SolarMax features state-of-the-art measuring and control electronics. A digital sig-
nal processor (DSP) generates the PWM signals and offers the following inverter
control functions:
■ Automatic on/off-switching
■
Grid monitoring (overvoltage, undervoltage, mains frequency, detection of
stand-alone operation)
■
Mains synchronisation and sinusoidal current control
■
Maximum power point tracking (MPPT, searching for the optimum operating
point)
■
Output limitation for oversized solar generators
■ Input and output current limitation
■
Monitoring of the power electronics
■
Monitoring of the heat sink temperature
■
Control of the graphics display
■
External communication via RS485 and/or Ethernet
Step-up converter Bridge circuit
Fault current
and earth
leakage
monitoring
Monitor with digital signal processor
Mains relay
EMC
Filter
en
PC interface
94