Eaton i-on50EX Installation Manual

Also see for i-on50EX: Quick user guide Administrator's and user guide

Before You Begin i-on50EX/EXDPage 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. PD6662 Grade3 requires 24 hours, or 12 hours when a suitablecommunicator is fitted. EN50131-1 Grade 3requires 30 hours (when the control unit is fittedwith a communicator) including two periods of 15mins in alarm.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-on50EX/EXD control unit, two i-kp01 keypads,and 20 wired PIRs the system takes the followingtotal quiescent current:Device CurrentControl unit PCB 120mA20 x PIRs at 15mA each 300mA1 x (wired expander) 20mA2 x i-kp01 at 30mA each(backlights off)60mASiren (quiescent) 25mATotal 525mADuring an alarm, these figures become:Device CurrentControl unit PCB 200mA20 x PIRs at 15mA each 300mA1 x (wired expander) 20mA2 x i-kp01 at 60mA each(backlights off)120mASiren (in alarm) 400mATotal 1040mAThe total amp hours required =(0.525 A x 29.5h) + (1.040A x 0.5h) = 16.01AhNote that for Grade 3 this example assumes thatthe communicator has its own power supply.One new, fully charged, 17Ah battery can providethe charge required by the example system andwould meet the Grade 3 requirements.Note: All current drawn from the Aux terminalsmust 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 cable with a characteristicimpedance of 100-120ohms eg: CAT5 or cabledesigned 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 butnot at the keypad or expander.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 20 devices to the controlunit bus. You may connect the devices either indaisy chain (serially), or in star (parallel)configuration at the control unit connector.