dewi heater controller
Contents
1. DEW HEATER CONTROLLER www awrtech co uk DESCRIPTION Connect this unit to nominal 12 Volt Power source ve to CENTRE capable of supplying peak currents in excess of the total of the dew heater strips The comprehensive range of measurements and indications will tell you the condition of the input the output and the heater strip The switch steps through the output power settings in an eleven step cycle The 0 setting has the output LED OFF when the heater strip is connected and the input is within working range The Input LED is near the input cable and the Output LED is near the output sockets OPERATION This product allows you to attach any standard Dew Heater up to the maximum wattage range suitable It assumes the voltage rating is for 12 VOLT and measures the 100 power rating on the fly It does not have to be dialled in The push button control nudges the output to the next higher level 0 to 100 in 10 steps calibrated in percent of full power and shows you the setting by the number of flashes Eleven presses of the switch will take you back to zero If you carry out power versus temperature rise experiments then you can dial in the exact temperature rise you need Output of 0 for whatever reason has the OUTPUT LED OFF INPUT LED OUTPUT LED MEANING GREEN Input Working properly GREEN Output Controlled OFF 0 supplied RED Open circuit output or Output Uncontrolled Check Battery RED FLASHING RED FLASHING Input pol2. arity reversed Output at FULL POWER alternating drooping under load RED GREEN Output Controlled then alternating uncontrolled Battery voltage too low The internal microprocessor keeps an eye on the voltage and current The Input Voltage lamp will go RED if above 15V or below 11 0V when drawing power at which point a lead acid battery is nearly discharged At the low input DEWI avoids giving the battery any further discharge and stopping any damage by turning OFF the heater current and the OUTPUT LED OFF In normal use the Output Monitor lamp is GREEN but will indicate RED if the output is uncontrolled or open circuit or above the 60 Watt rating possibly short circuit The uncontrolled output can occur if you require high output but the input voltage is low so it cannot give the output you have dialed in A reversed battery connection will apply full power to the heater but both lamps will be FLASHING RED indicating REVERSE INPUT FAULT In this condition the output is Uncontrolled but at FULL POWER The LED indications allow you to investigate properly before a fuse blows or your image is spoiled by a loose or broken wire connection The power circuit uses highly efficient PWM technology by microprocessor and so generates very little heat itself resulting in a small but powerful unit There are no batteries and as a bonus the circuits are fully protected from reverse polarity and do not emit RF interference to CCD came
3. ras and other equipment Because of the input voltage state monitoring it will take care of your battery or Power Tank and will not let it go completely flat Look after your battery by checking the LEDS now and again SPECIFICATION INPUT 10 to 18 Volts DC up to 5 Amps INPUT LEAD Cigar plug length 2 metres FUSE 5 Amp fuse in Cigar plug OUTPUT CONNECTOR 2 off RCA PHONO sockets MAX POWER Max 60 Watts 5 amps at 12 Volts OUTPUT CONTROL DEW HEATER STRIPS 0 to 100 in 10 Steps Any combination up to 60 Watts total INPUT LED Indicates OK Reversed or voltage out of limits OUTPUT LED Indicates OK open circuit not powered CE marked ACCESSORIES PHONO ADAP PHONO output splitter gold plated contacts For an extra strip PSU3 DEW Mains adapter 12V DC at 5 Amps with correct socket fitted DEW XTN 2 metre Cigar extension lead at the power supply end fused 5 Amps UPDATES FURTHER INFORMATION ON THE WEBSITE www awrtech co uk GUARANTEE Units are guaranteed for 1 year from purchase against defective materials and assembly Please keep an eye on the website for User Manual revisions In any query contact AWR Technology The Old Bakehouse Albert Road DEAL Kent CT14 9RD 01304 365918 441304 365918 alan awrtech co uk Manual V0 2 Feb 2009 part number 8060 09B
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