Invensys MSC-UC-AC Analog Current Output Card

MSC UC AC Unit Controller Current Output Card in U S A 22 GUIDELINES INCLUDED THIS PACKAGE REQUIREMENTS Switch AND OFSET SUPPORT Repairs MSC UC AC MicroSmart Unit Controller Analog Output Card is designed to provide direct control for typical air handling units or other equipment The MSC UC AC can be into the MSC Ul 000 or MSC UC Unit Controllers or the DCM UC Digital Module Unit Controller MSC UC AC provides a single O 20 mA dc signal The card uses a 1 e bit digital to converter Current sourcing is supplied Zero of output produces 0 mA flow in the loop of output produces a 4 mA flow and 100 of produces a flow of 20 mA The analog output is optically isolated from the controller logic NO MSC UC AC One O 20 mAdc sourced 800 ohms maximum 5.2 microamperes typical ENVIRONMENT 32 to 122 to 50 0 to 90 RH non condensing REQUIREMENTS Provided by unit controller 3 x 4.5 76.2 mm x 114.4 mm Plug in card for MSC UlOOO or MicroSmart Unit Controllers or the Digital Control Module Unit Controller GUIDELINES equipment has been tested and found to with the limits for a Class digital device to Part 15 of the FCC rules These limits designed to provide reasonable protection harmful interference when the equipment is in a commercial environment This generates uses and can radiate radio energy and if not installed and used in with the instruction manual may cause interference to radio communications of this equipment in a residential area is to cause harmful interference in which case user will be required to correct the interference his own expense beginning the installation process for the visually inspect the unit for any defects and to make sure all parts are If any flaws are detected contact your Robertshaw office or authorized representative further details software configuration please to the DMS PC Operator Interface User and the MicroSmart Operator Interface Guide INCLUDED IN THIS One Nl 1046 MSC UC AC Unit Controller Current Output Card One Nl OO 6976 MSC UC AC Installation One N100 410518 two position connector to the unit controller should be off during of any output option card to prevent damage the controller or option card INSTALLATION GUIDELINES MSCUC AC Controller Analog Current Output Card 1 REQUIREMENTS power for the MSC UC AC is supplied by the controller MSC UC AC is a self contained circuit board assembly is required Switch just below the power input connector switch for the unit controller The upper is ON and the lower position is OFF the turn the controller OFF before removing covers for servicing or to install cards MSC UC AC can be inserted into any of the five slots of the MSC Ul 000 MSC UC or unit controller MSC UC AC fits into any one of the five option on the MSC UlOOO MSC UC or DCM UC unit Follow these steps to install the card Turn off AC power to the unit controller Insert the MSC UC AC into the desired option on the unit controller Slide the card into the guides until the gold contacts touch the top the connector verify that the card is properly then push the card firmly in place the each connector is keyed to match a in the gold contacts on the edge of the INSTALLATION GUIDELINES OUTPUT CONNl 6762 0 mA INPUT DEVICE OHM INPUT SHIELD VvlRE AT END WlRE JACKET AND TO PREVENT LOOP LUG ON UNIT ENCLOSURE Analog Output Current Wiring Diagram 2 plenum and riser rated 1000 feet or over 1000 feet a9503 a91 32 use the following cable types Wiring is terminated to the two position connector Consult device installation information for proper to its insertion in CONNl at the top right of A0 card The MSC UC AC is designed to deliver a 20 mA current into an 800 ohm maximum load load be from 0 to 800 ohms including line The negative side of the user load be tied to earth ground or it may float If float it will be referenced to the unit isolated output ground Figure 2 typical wiring The white wire positive goes from the A terminal CONNl to the user input the black wire goes from the B terminal to the user ground If not specified ground shield at controller enclosure Cut shield at opposite of cable and tape end to prevent contact with the CONNl is possible housing to slip off the connecting pins preventing a sound connection with the mating plug Carefully the socket housing to see connecting pins if so simply push connecting of CONNl it has slipped down place plug check for output on the plug back INSTALLATION GUIDELINES AND OFSET calculating SCALE and OFSET for this the following values will remain constant value of user engineering units minimum output mA calculate SCALE and OFSET for this device use the formula to 100 is equal to 4 to 20 mA 6.25 I mA 20 mA x 6.25 mA 125 0 4 mA x 6.25 mA 25 value of user engineering units Linear Low LIN L maximum output mA P O1 for slot 1 P O2 for slot 2 etc EUma EUmin lmin 20 mA x Slope EUmin Imin x Slope Linear Low LIN L P O1 for slot 1 P O2 for slot 2 etc examples of SCALE and OFSET begin on the following page the following examples assume that the device controlled by the MSC UC AC is a damper with a value measured by the amount that it open or closed This value is expressed by a 1 this example the damper motor is fully closed at mA 0 a