Eaton i-on30EXL Installation Manual

Before You Begin i-on30EXL/EXDLPage 12Power AvailabilityBefore connecting any external devices to thecontrol unit, you must make sure that the controlunit can provide sufficient current to power thesystem during a mains failure for the time requiredto meet the appropriate standard.EN51031-1 Grade 2 and PD6662 Grade 2 bothrequire 12 hours standby time.Note: When calculating the average load duringthe standby time period you must allow for at leasttwo periods in alarm. To take the worst case thesetwo periods of alarm should each be 15 minuteslong, the maximum permitted in EN50131-1section 8.6.The amount of current available from the controlunit depends on the size of battery fitted and itshealth. The current taken by the control unit PCB,communicator and keypads is given in TechnicalSpecifications – EN50131-6 Ratings on page 37.The following calculation shows a simplifiedexample: in an alarm system with an i-on30EXL/EXDL control unit, two i-kp01 keypads,and 15 wired PIRs the system takes the followingtotal quiescent current:Device CurrentControl unit PCB 100mA15x PIRs at 15mA each 225mA15 wired door contacts @2mAeach30mA2 x (wired expander @ 40mAeach)40mA4 x i-kp01 at 30mA each(backlights off)120mA4 x Sirens (quiescent) at 25mAeach100mATotal 615mADuring an alarm, these figures become:Device CurrentControl unit PCB 120mA15 x PIRs at 15mA each 225mA15 wired door contacts @2mAeach30mA2 x (wired expander) 40mA4 x i-kp01 at 60mA each(backlights off)240mA4 x Sirens (in alarm) at 400mAeach1600mATotal 2255mAThe total amp hours required =(0.615 A x 11.5h) + (2.255A x 0.5h) = 8.2AhOne new, fully charged,17Ah battery can providethe charge required by the example system andwould meet the Grade 2 requirements.Note: All current drawn from the Aux terminals(12V) must be included in the overall calculation.CAUTION: Ensure that the system does notdemand more than the maximum current availablefrom the control unit during an alarm, see page37.Bus Cabling RequirementsCable TypeIn general, the control unit requires standard 7/0.2un-screened four core alarm cable for wiring thebus.For maximum performance in harsh environmentsuse twisted pair screened cable with acharacteristic impedance of 100-120ohms eg:Belden 8132 or cable designed for RS485.Use one pair for data lines A and B. Use the otherpair for 12V and 0V. For optimum performancethe voltage at the keypads and expanders shouldbe greater than 12V.Screened cable may prove necessary if theinstallation site has equipment that produces highlevels of R.F. (Radio Frequencies). For example,welding equipment is known to produce a largeamount of radio interference. If screened cable isrequired, you should keep to the followingguidelines:1. Avoid earth loops by connecting the screen onthe cable to mains earth at the control unit butnowhere else.2. The continuity of the cable screen is mostimportant and screens MUST be continuousalong the full length of the cable.3. Where the cable enters any metal enclosure,ensure the screen is isolated from the case.Cable SegregationSegregate the bus cabling from any other wiring,such as mains supply cables, telephone cables,computer network cables and R.F. cables. Usecable ties to keep cables separated.Keep the bus cable clear of cables supplyingsounders, extension loudspeakers or any otherhigh current devices.Cable Configuration and LengthYou can connect up to 10 devices to the controlunit bus. You may connect the devices either indaisy chain (serially), or in star (parallel)configuration at the control unit connector.