HOW IT WORKS
EN / Mass Combi 12/2500-100; 24/2500-60; 48/2500-35; 48/5000-70 / May 2010 11
3.3.5 Power support function (selectable)
As explained above, when the Generator / mains support
function is enabled, the inverter will operate in parallel with
the external AC power source. This means that energy
from the batteries is added to the AC-output only. Under
no circumstance AC power from the inverter can be fed
back into the AC grid. Please mind that several countries
maintain different regulations with regard to AC-sources
operating in parallel with the AC-grid. This may mean that
in some situations the use of the Generator / mains
support function is not allowed. Please acquaint yourself
with local regulations on this issue. Never use the
Generator / mains support function if this is not allowed!
Even if the use of the Generator / mains support function
is not allowed, it is still possible to supply more energy
than the external AC sourced can deliver This can be
achieved by using the Power support function.
See figure 9
The AC-input is still limited to 6 Amps. This is not enough
to supply the total load (4 + 9A = 13A) connected to the
AC outputs.
Now when the Power support function is enabled, the
transfer relay will open. When opened, the external power
source will deliver 4A to supply the load connected to the
“POWER” output only, while the inverter will deliver 9
Amps for the load connected to the “SHORT BREAK”
output.
Please note that if the power consumption of the
“POWER” output exceeds the setting of the power support
function, the external AC fuse will still trip
If the total current from the “POWER”-output and “SHORT
BREAK”-output is less then the Power support setting
during approx. 10 minutes, the Mass Combi connects the
“SHORT BREAK” output back to the AC-input again
The charger commences charging again when the load
reduces further and the total current drops below the
Power sharing setting.
NOTE! You can either choose the Generator /
mains support function or the Power support
function, not both simultaneously.
3.3.6 Summary of the AC operation modes
Function DIP-switch* What is it used for? How is this achieved?
Power Sharing B-SW3 To protect the incoming AC
from overload
By reducing the charge current and thus the AC input
current.
Generator / Mains
support
B-SW5 To deliver more AC power
than available from the
incoming AC.
The AC output of the inverter is connected in parallel
with the incoming AC. This means that energy from the
batteries is added to the incoming AC.
Power support B-SW4 To deliver more AC power
than available from the
incoming AC.
The load which is connected to the “POWER”-output is
supplied by the incoming AC, while the SHORT BREAK
output is connected to the output of the inverter.
Table 6: Overview of the AC operationmodes
* see chapter 6 for adjustment of the DIP-switches
AC INPUT
AC OUTPUT
“POWER”
AC OUTPUT
“SHORT BREAK”
AC
DC
BATTERIES
POWER
SUPPORT
FUNCTION
4A
4A
9A
Max. 6A-AC
9A
Figure 9:
Power support function
Approx.
200A-DC
@12V
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