SECTION 10 |
Protections
45
10.3 LOW DC INPUT VOLTAGE SHUT DOWN
If the voltage at the DC input terminals falls below 10V ± 0.1V for 12V versions or 20V
± 0.2V for 24V versions, the AC output is shut down. Buzzer alarm is sounded.
The Green LED marked “POWER” (2, fig 6.1a) will remain lighted.
The unit will reset automatically when the DC input voltage rises > 11.5V ± 0.3V for
12V versions and > 23V ± 0.5V for 24V versions.
10.4 HIGH DC INPUT VOLTAGE SHUTDOWN
If the voltage at the DC input terminals exceeds 16.5V for 12V versions or 33V for 24V
versions, the AC output voltage will be shut down temporarily. Buzzer alarm will be
sounded. The Green LED marked “POWER” (2, fig 6.1a) will reman lighted. The unit
will be reset automatically when the voltage drops down to < 16.5V for 12V versions
and to < 33V for 24V versions.
10.5 OVER-TEMPERATURE SHUT DOWN
In case of failure of the cooling fans or in the case of inadequate heat removal due
to higher ambient temperatures / insufficient air exchange, the temperature inside
the unit will increase. The temperature of a critical hot spot inside the inverter is
monitored (Power Transformer T3), and at 90°C ± 5°C, the AC output of the inverter
is shut down temporarily. Buzzer alarm will be sounded. The Green LED marked
“POWER” (2, fig 6.1a) will remain lighted.
The unit will automatically reset after the hot spot has cooled down to 70°C ± 5°C.
10.6 INTERNAL DC SIDE FUSES
The following DC side fuses have been provided for internal protection of the DC
input side. The fuses are 32V, Automotive Type Blade Fuses, Type “ATC” by Cooper
Bussmann or equivalent:
SWI 3000-12: 12 pieces of 30A in parallel = 360A total
SWI 3000-24: 12 pieces of 15A in parallel = 180A total
10.7 REVERSE POLARITY AT THE DC INPUT TERMINALS
The positive of the battery should be connected to the Positive DC input terminal of
the inverter and the Negative of the battery should be connected to the Negative
DC input terminal of the inverter. A reversal of polarity (the Positive of the battery
wrongly connected to the Negative DC input terminal of the inverter and the
