Edwards 970524 Tech Bulletin

Edwards Signaling Products Fieldstone Court CT 06410 699 3000 203 699 3108 Bulletin No Category PLC Connectivity of 103 Chameleon Chameleon 103I Series features an on board processor with an internal which allows the single unit to function as either a steady or flashing visual Either a PLC or contact closure can activate any one or all three lights first light activated will illuminate either steady or flashing determined by the jumper position When a second light is activated the Chameleon cycles the two colors and activation of a third light causes it to cycle between all colors 103 model performs similar to the 103I but all signal operation in the is controlled directly through a PLC ladder logic rather than through the internal processor The PLC will control which color LED are on long they are on and whether they are steady on or flashing PLC connectivity there are two considerations that need to be for proper operation of the Chameleon Multi status Indicator The first has to do with the type of output card utilized on your PLC Both the and the 103I require the PLC to have a Sinking Output card For the to operate properly you must have a Sinking Output The illustration shows a Sinking Output It is important to make sure the Output Card on your PLC has a Sinking Output Bulletin 970524 1 of 4 second consideration has to with 120VAC units A resistor has to be to the circuit to eliminate any leakage current that can false activate the The following calculation will guide you in determining the proper size to use with your specific PLC IMLChameleon 2 mA IDissipated IDissipated VOutput 3 Wattage rating for your dissipating 120VAC Output from your PLC The amount of current to be 1 Leakage Current from your PLC Maximum Allowable Current for the mA Tolerance Factor The amount of current to be dissipated 2 IDissipated R 120VAC Output from your PLC The amount of current to be dissipated Resistor value to dissipate leakage current 1 mA 5 mA 2 mA 12 mA 2 IDissipated R 12 mA R 10,000 ohms 120 VAC PLC output card has a leakage current of 15 mA What size resistor will you to use to dissipate the leakage current IMLChameleon 2 mA IDissipated IDissipated VOutput 3 12 mA 120 VAC 1.44 watts your resistor needs to be ohms and 1.5 watts Bulletin 970524 2 of 4 Electrical Characteristics with any product being connected to the output card of a PLC there are electrical characteristics that must be taken into consideration Operating Voltage the voltage that must be applied to the unit for it to properly card Criteria The operating voltage must be within the range of the PLC What if the signal is rated higher than the PLC output card The What if the signal is rated lower than the PLC output card The will not function properly could be damaged by over voltage and the PLC card could also damaged Surge inrush duration The instantaneous current surge that occurs each the signal is turned on It is defined as a current over a period of time Criteria Both current magnitude and time duration of the surge inrush the signal must be within the range specified for the PLC output What if the signal surge current falls within the range but the time for the surge is beyond the range compared to the PLC output and vice versa The user should consult with the PLC for additional data Failure to do so could damage the card Continuous on Current The current that the signal will draw in continuous Criteria For Triac outputs there are two criteria to consider the load required by the output card to keep it turned on and the current that the card can safely supply The continuous current for the signal must fall between the minimum load current the continuous on current of the PLC for the signal to function What if the signal continuous on current is below the minimum load for the PLC The signal will not function because the PLC will turn on What if the signal continuous on current is above the continuous on rating for the PLC The PLC output card could be damaged to excessive current draw Bulletin 970524 3 of 4 Off State Leakage Current The current that leaks from the PLC in it off Criteria The off state leakage current from the PLC must be less than What if the off state leakage current from the PLC is greater than the maximum allowable off state leakage current for the signal allowable off state leakage current for the signal The may turn on and false activate Characteristics for the 103 Series Chameleon ax off state current current perating DC No G1 A G 1 N5 A N5 All AC volts at 60 Hz AC perating DC No 1 A G 1 A N5 All AC volts at 60 Hz AC A A Am ps m illiseconds Characteristics for the 103I Series Chameleon ax off state current current Seconds S econds A A Am ps m illiseconds Bulletin 970524 4 of 4