LED Indicator:
The LED indicates various modes of operation of the inverter.
•
LED lights continuously green
Normal operation of the inverter within specified parameters.
•
LED flashes red
The battery voltage is below nominal. Depending on the current draw, continuing use
may lead to shutdown due to too low battery voltage.
•
LED lights continuously red
o
The rated minimum voltage has been exceeded, the battery is discharged. To protect the
battery from destructive deep
discharge, the device has shut off the AC voltage.
Resetting the device is possible after the battery has reached the minimum
operating
voltage of the inverter.
o
The maximum rated short-term power of the device has been exceeded. The overload management has turned off the output
of the transformer. The attached load has too high a power consumption, too high inrush current or is defective, leading to a
short circuit in the inverter output. The transformer now attempts a warm restart five times every five seconds and then every
thirty seconds. During the restart attempt, the LED briefly glows green. If the voltage transformer does not turn on after several
restart attempts, you should disconnect the consumer load from the output of the voltage transformer and check the function of
the voltage transformer. Check the load device with mains voltage and have it repaired or maintained by a technician in case
protective components have been triggered.
Connection and Operation
Check for matching voltage specifications on the inverter and the desired load devices. Use only wire of sufficient cross-section for the
DC-leads and make sure to have generous connecting surface between the wire and the DC-connectors. On the SW-150, the
connecting leads are installed with a plug for a 12 V car jack.
•
Caution: To achieve proper electrical contact between the bolts and the printed circuit board, always fasten the nuts of the
DC connectors (figure 1) even if only used for testing purposes.
Check for adequate air clearances at the ventilation slots to ascertain sufficient cooling. Never cover the ventilation slots and never
operate the device near combustible materials.
Connect the inverter with the DC power supply and switch it on. If everything is connected properly and operated within specified
parameters, the green LED will light up.
General notes on operating AC loads with inverters
In general, all AC loads may be operated with inverters. To estimate the power requirements and necessary reserves, one needs to
know some characteristics of typical AC loads. Most AC loads have been designed for mains operation. One important item to note
however is the required inrush current which does not play a big role when operated on mains voltage since the mains grid is capable of
delivering very large currents. Manufacturers therefore do not focus on inrush current. In the case of various consumer loads, this value
may be higher by a multiple than the value resulting from the rated power output of the device.
•
Incandescent lamps up to 8x higher inrush current within 1 sec
•
Refrigerators up to 10x higher inrush current within 3 sec
•
Television sets up to 10x higher inrush current within 1 sec
Therefore it is important to choose the inverter for sufficient power reserves. For example an inverter supposed to supply a small
refrigerator of 50W nominal power has to deliver a peak power of 500W.
Reverse Polarity Protection
In case the DC input is accidentally connected with reversed polarity the current is flowing across a diode and triggers the fuse. In this
case the proper polarity must be established and the fuse replaced.
Replacing the Fuse
The fuses are located under the DC connector cover (12V: 40A; 24V: 20A). In case the fuse is blown the inverter has to be disconnected
and the fuse replaced with a new one of the same current rating. Subsequently check the device without any load connected. In case
the fuse blows again the device is defective and has to be repaired by an authorized technician.
Remote control
To connect the remote control we suggest stranded wire of 2, x 0,5mm². The cable may be extended up to a length of 10m. You may
use any switch as ON/OFF switch, since the internal 12V direct voltage is used as switching voltage.
Recommended minimum DC wire cross-section
Up to 2m
3m
SW-300
16mm²
16mm²
SW-600
16mm²
16mm²
SW-1200 25mm²
35mm²
SW-2000 35mm²
50mm²
