Chapter 3 - 2 Installing I/O Network Boards: Power ... - icemeister.net

Chapter 3 - 2Load Factorsand Power SuppliesInstalling I/O Network Boards: Power Supplies,Enclosures and Alternative MountingEach of the boards made for use in the I/O network has a load factor. There are three power supplytypes. The IOPS will supply power to any group of boards whose load factors total 7 or less. TheIOPS2 will handle up to a load factor total of 26. The IOPSWM is a plug-in power supply which willhandle any single I/O device. The load factors of the I/O boards are as follows:I/O Device Load FactorRO8 or RO8S 2SI8 1OI8 or OIL8 1VO2 1LD 1000 2OAB-1 1OVR8 1The IOPS Power SupplyThe Danfoss IOPS power supply is designed to provide 12 VAC for a number of I/O boards with anaggregate load factor of 7 or less. Be careful to observe the maximum power supply cable lengths givenin the table on the instruction sheet (there is a copy in Appendix B).Line voltage to the power supply can be either 110 VAC or 220 VAC, and is selected by positioning aplug-in jumper as for the AKC 55.If 120 VAC power is applied to an IOPS power supply with the jumpers set for 220 VAC, and the outputvoltage is connected to I/O boards, the green LED’s on the I/O boards will be lighted, but it will not bepossible to bring the I/O boards on line.Don’t let theload factortotal exceed 7on an IOPS !3-12 System Manual RC.IU.B1.22 4/99.1 AKCESS

The IOPS2 Power SupplyThe IOPSWMPower SupplyThe Danfoss IOPS2 power supply is designed to provide 15 VDC for a number of I/O boards with anaggregate load factor of 26 or less. Cable lengths from the IOPS2 power supply to I/O boards must bein accordance with the table in the IOPS2 instruction sheet (there is a copy in Appendix B).The IOPSWM plugs into a 120 VAC outlet and supplies power to any single I/O device.IO4R EnclosureThe IO4R rainproof enclosure contains an IOPS power supply to provide 12 VAC to the I/O boardsmounted in it up to a load factor total of 7 (see the IOPS instruction sheet in Appendix B.The IO4R enclosure has four 3" snap tracks and is designed to contain 4 full-size I/O boards (RO8, SI8,or OI8). Since VO2 boards are comparatively short, one or more of the snap-tracks can be used for twoVO2’s. The enclosure is provided with rear mounting holes and has labeled cable knockouts for class 1and class 2 wiring in both top and bottom.IO12 EnclosuresThe IO12 enclosure series allow for mounting up to twelve I/O boards of any mixture per enclosure.Each IO12 contains one or more IOPS power supplies as follows:IO12-1IO12-2IO12-3IO12-41 IOPS2 IOPS3 IOPS4 IOPSAlternative Mountingfor I/O BoardsIn OEM control panels or other enclosed spaces where the IO4R enclosure is not appropriate, snaptrack for I/O boards can be mounted on any flat surface where codes and good electrical practice permit.A Danfoss IOPS-series (IOPS, IOPS2, or IOPSWM) 12 VAC or 15 VDC power supply should be usedto provide operating voltage for I/O boards not mounted in Danfoss I/O enclosures.AKCESS System Manual RC.IU.B1.22 4/99.1 3-13

Chapter 3 - 3RO8 Description andIdentificationInstalling RO8 and RO8S Relay Output BoardsRO8 and RO8S Relay Output boards are identical except for the override switches found on the RO8Sboard. The RO8 Relay Output board provides 8 relay outputs in an AKC 55 system for control of avariety of loads. Normally open, normally closed, and common terminals are furnished for each RO8output. RO8 outputs are individually fused at 5 amps. Each output has an LED which lights when therelay coil is energized.Each RO8 or RO8S is supplied with two spare relay fuses in holders at the right edge of the board.Since they are nodes on the I/O network, RO8 and RO8S boards communicate with a host AKC 55 overTP-78K twisted-pair shielded cable.The board’s name and version number are printed on the board as shown in the illustration below:MountingRO8 and RO8S boards are designed for 3" snaptrack mounting in either a Danfoss IO4R or IO12enclosure, an OEM control panel, or other enclosed spaces. Snaptrack for I/O boards can be mounted onany flat surface where codes and good electrical practice permit. A Danfoss power supply (IOPSseries)should be used to provide operating power for I/O boards not mounted in a Danfoss IO4R orIO12 enclosure. Select mounting locations so that the wiring distance between the RO8 and its powersupply is in accordance with the table on the appropriate IOPS-series instruction sheet (see AppendixB).3-14 System Manual RC.IU.B1.22 4/99.1 AKCESS

Addressing anRO8 or RO8SEach RO8 board connected to an AKC 55 must have a unique address in the range 01-99. The address isset by the two rotary switches located side-by-side beneath the board’s “status” and “service” LED’s.Each switch has an arrow pointer which serves also as a screwdriver slot. Use a small screwdriver torotate the arrowhead on each switch until the left arrowhead points to the first digit, and the rightarrowhead to the second digit of the correct address.Network ConnectionsRO8 and RO8S boards are connected to the I/O network at the terminal strip labeled “NETWORK”.When connecting from board to board (point-to-point or “daisy-chain” wiring), use only twisted-paircable meeting the specifications given in the illustration below. There is no polarity to observe; connectthe two signal wires to the terminals labeled “A” and “B”, and the cable shield to the terminal labeled“shield”.You’ve heard thisbefore....Terminatethe last board onevery main I/Ocable run!AKCESS System Manual RC.IU.B1.22 4/99.1 3-15

Controlled LoadConnectionsEach load to be controlled is connected to a relay output by wiring to the common (“C”) and either thenormally open (“NO”) or normally closed (“NC”) screw terminal on one of the eight sets of terminalsalong the bottom edge of the board.RO8 PowerConnectionsAs with all I/O boards in the AKC 55 system, 12 VAC from a Danfoss IOPS-series power supply isconnected to a terminal strip labeled “12 VAC” on the RO8 board. The power terminal strip is shown inthe upper left corner of the illustration.Make sure the distance fromyour IOPS-series power supplyto the I/O board is within thelimits given in the table in theIOPS instruction sheet !Inspection of theInstalled RO8When an RO8 Relay Output Board is ready for operation, you should be able to observe the following,proceeding clockwise around the board from the power terminal strip:1. Power (12 VAC or 15 VDC) has been connected to the “12 VAC” terminal strip.2. The status LED should be blinking. If the status LED is off, there is no power to the board (checkthe fuses). If the status LED is constantly on (not blinking), the board is not communicating withits AKC 55. Make sure the AKC 55 has been configured for this board; if configured, there will beinformation in at least one of the Board and Points screens; you can investigate, and supplyconfiguration information, if necessary, by following the procedures described in Section IV of thismanual.3. The service LED will normally blink briefly when the network is scanned, but if the service LEDremains steadily on, or blinks repeatedly, the RO8 board is defective and should be replaced.4. The address switches have been set to a valid address.5. Loads are connected to one or more of the terminal strips numbered from 1 to 8. When a controlaction by the AKC 55 causes a relay coil to be energized, the output’s LED lights.6. Connection has been made to the I/O network of an AKC 55 at the “NETWORK” terminal.7. If this board is the last node on a main run, make sure that it is terminated by using one of theterminators supplied with the AKC 55.3-16 System Manual RC.IU.B1.22 4/99.1 AKCESS