© COSUPER ENERGY LIMITED SCH series Issue: 5 - 07/11/16
ON OFF
INVERTER
ALARM
REMOTE PANEL
Remote Control
An optional remote can be purchased for the SCH300, SCH600, SCH1000,0
SCH1500, SCH2000 and SCH3000.
P/No. CR10.
To install the remote control, insert the plug into the RJ45 socket on the
front panel.
The remote has the ability to turn the inverter on and off remotely and indicate
when the inverter is on.
FAQ
Q. Why does the inverter turn itself off?
A. If the inverter’s audible alarm sounds and a fault L.E.D illuminates, this indicates that there is a fault or error, and the inverter may turn off. Most
commonly this would be caused by an appliance that is drawing too much power (overloading), low battery voltage or voltage drop due to
insufficient size cables or poor connections.
Q. The Inverter will not run my appliance even though the appliance draws less power (Watts) than the size of the inverter?
A. Electrical appliances can be divided into three groups by the way they draw energy (current) from their power supply. These groups are
“Resistive”, “Inductive” and “Capacitive” appliances or also called “loads”. Some appliances may draw all three types of power.
Resistive Loads such as normal incandescent lights (wire filament) always draw a constant power (watts) from the power supply, that is a 100 Watt
light will draw approximately 100 Watts from the power supply at all times. Resistive loads are the easiest appliances for an inverter to run.
Inductive Loads such as a refrigerator (Electric Motor) require a large rush of power (surge current) to start and then usually draw a more constant
power once running. Inductive loads contain coils of wire (motors, transformers, ballasts, solenoids). When the power is first turned on,these coils of
wire draw a large surge current which forms the magnetic flux (magnetic field) which allows these appliances to work. This magnetic flux is a kind of
stored energy.
The most common inductive appliances are: fridges, air compressors, transformers/ chargers, pumps, power tools and fluorescent lights. These
appliances may draw up to 10 times their normal running power to start up; that is to run a 80W fridge you may need a 600 or 1000 Watt inverter.
Capacitive Loads such as many TV’s or many electronic appliances require a large surge current to start only when they have not been used for a
while. This is often due to large capacitors in the power supply that must be quickly charged when the appliance is turned on. If the appliance is not
used for a few days these capacitors slowly go flat. Resetting the inverter a couple of times may allow these appliances to work.
Q. Why does it damage the inverter if the battery leads are reverse-connected?
A. Your inverter uses sophisticated electronics to convert DC battery power to AC mains power. If you accidentally connect the inverter to the
battery incorrectly (reverse polarity) a large current will be drawn by the inverter which will blow the protection fuse. As this occurs some of the high
current could damage sensitive electronic components. Because of this risk it is important to always double-check the battery polarity before making
any connections.
Q. How do I check or change the fuses?
A. SCH inverters contain internal fuses and should only be checked or replaced by a qualified electrical appliance repairer.
THE DC SUPPLY MUST BE DISCONNECTED BEFORE ANY REPAIR, THEN TURN THE ON/OFF SWITCH OF THE INVERTER “ON” TO
DISCHARGE THE CAPACITORS.
Q. Can I run laptop computers and other sensitive electrical appliances?
A. Yes. SCH’s pure sine wave output is suitable for medical equipment and sensitive electrical appliances. They allow you to watch television
without static, operate computers and gaming consoles and run fluorescent lights.
6. TROUBLE SHOOTING
Symptom Possible cause Solution suggested
Inverter will not turn on during initial
power up
Appliance power is less than rated power
but inverter red LED light on and alarm
buzz on
Low battery capacity cause short DC input
power although the battery voltage is higher
than rated voltage.
Batteries are not connected; loose battery-
-side connections or low battery voltage
Check batteries and cable connection.
Check DC fuse and breaker; Charge Battery
Press the switch to ON position; Switch to
Remote position and turn on by controller
Check battery condition and recharge if
possible
Check battery voltage and ensure inverter
connect to the 12V battery(batteries).
Turn off inverter and allow inverter cool;
Reduce the load on inverter to rated power
Use amperemeter check the DC input amp;
Recharge the battery. Or contact the dealer
for assistance.
Inverter has been manually transitioned to
OFF mode
Low battery voltage and low capacity level
Inverter is over temperature or overload
Too high battery voltage
Motored appliances required big start power
that is over inverter surge power Choose the higher power inverter
NO AC output voltage and no indicator
lights ON
AC output cut, red LED light on and alarm
buzz ON
Motored appliances cannot fully run
