MicroTech® Series-100 Application Specific Controller
Contents
1. Normally Closed Field Wiring Terminal Board RR 00000000 Digital Output Service Information 20 Wiring D lagram The following wiring diagram is identical to the one in the ASC 100 Panel It is reproduced here for your convenience The legend is shown in Figure 15 Figure 15 ASC 100 Panel Schematic Legend Component Designation Description CBI Circuit Breaker MCB Microprocessor Control Board Tl Transformer 115 24 Vac T2 Transformer 24 Vac 18 Vac CT Ill Factory Wire Number 9 Field Wiring Terminal oom EI a ajas Field Wiring Printed Circuit Board Terminal Twisted Shielded Pair Cable Figure 16 ASC 100 Panel Schematic HOT NEUTRAL GRD O ae CN D15AMPS E CB1 0 5AMP 50 L1 ak 115V w L2 GRD 0 e a O 2 d geed TOPERSONAL __ COMPUTER __ TB2 OUTPUTO OUTPUT1 OUTPUT2 OUTPUT3 OUTPUT4 OUTPUTS ER OUTPUT D FIELD x TERMNAL 2 BOARD SE 2 FROMNETWeRk A MASTERPANH ka PORTB PERSONALIT BOARD a0195 IM 657 1 Test Procedures A listing of MicroTech related part numbers is included in the Parts List section of this manual If the MCB must be replaced refer to the MCB Replacement section of this manual LED Diagnostics The MCB LED indications can aid in controller diagnostics If the status LEDs do not operate normally as described in the Component Data section of this manual there is2. Installation amp Maintenance Data Group Controls Part Number 594861Y Date March 1998 MicroTech Series 100 Application Specific Controller McQuay 1998 McQuay International International Contents Le CN 2 UN Dir ee EEN 2 derer D e EE General Description Sek EEEEER E KEE ECEERE CES EEEEEEEE mennun nnmnnn nnmnnn ennnen nnmnnn nnmnnn Component Data sie dvecs scsvevesecs rerien eE Ee Microprocessor Control Board ANNE Field Wiring Terminal Board ENNEN Software IDa renn slim E R OERE lae Sd MicroTech Monitoring and Networking Options POMON OTA vende eee ah ee in eel ee eelere EA Network Master Bangla ssscsscssthessssteousee aves s di e E SALSA ANL KHL doses dE EA DE UE e TTT Panel Location and MOUNN Ersen nrt E o i r ORASE DE Ee Salim EES Field MEIER Network Copa Eeer BCEE EE EEN AE ee Eege Analog Digit lilnp tsmuuss mums Lin Res Sea ot ami maksale Service Information rernnnnnnnnnnnennnananannnnnnnennnanaaanannnnnnnnnanaaanannnnnnnenananananaa Wiring Ter Test Procedures E LED Diagnostics i ctein eet anand NEN AR leis Troubleshooting Power Problems AE Troubleshooting Analog Digital Input Troubleshooting Digital Outputs imeeeeees MCB Replacement imal har ae caked Sone a tee atc yale ad hee IN CHE EE E Ee Illustrations Figure 1 MicroTech ASC 100 Panel Layout Figure 2 Microprocessor Control Board OMCHR ANNE Pigtire 3 Hex EE Figure
3. 4 Thp t SWILCHES 145 14 1334 Sokk n sek AA AEGA kaa SE kana E ak had Figure 5 Field Wiring Terminal Board ANEREN Figure 6 ASC 100 Panel Dimensions NENNEN Figure 7 Field Wiring Schematic Typical Network with ASC IO Figure 8 RS 232 Cable Pinouts for 9 Pin Serial Ports AMP Connector Figure 9 RS 232 Cable Pinouts for 25 Pin Serial Ports AMP Connector Figure 10 RS 232 Cable Pinout for 9 Pin Serial Ports Phoenix Connector Figure 11 RS 232 Cable Pinout for 25 Pin Serial Ports Phoenix Connector Figure 12 Analog Digital Inputs Field Wiring Connection Figure 13 Digital Output Normally Open Contacts Figure 14 Digital Output Normally Closed Contact ANEN Figure 15 ASC 100 Panel Schematic Legend Fisure 16 ASC 100 PanelSCheM tiG eieiei EEN enee Eesen Figure 17 MCB Power Connector ENEE Tables Table 1 Maximum Output Ratings ENEE 7 IM 657 1 IM 657 1 Table 2 PE Speciation scsi A E EE EE Table 3 ASC 100 Panel Environmental Specifications McQuay AAF and MicroTech are registered trademarks of McQuay International Monitor and Open Protocol are trademarks of McQuay International Microsoft and MS DOS are registered trademarks of Microsoft Corporation IBM is a registered trademark of International Business Machines Corporation 1998 McQuay International All rights reserved throughout the world Introduction This manual provides information about the MicroT
4. For network communications to occur a twisted shielded pair cable must be connected between an NMP or other MicroTech control panel and the ASC 100 This interconnecting daisy chain wiring is shown in Figure 7 Network communications is accomplished using the RS 485 interface standard at 9600 baud About MicroTech Network Architecture All controllers in a MicroTech network are assigned a level level 1 level 2 or level 3 All networks must have one level 1 controller to coordinate communications Multiple level 2 controllers connect to the level 1 controller with a communications trunk an isolated section of the daisy chained network wiring In Figure 7 the network wiring between all controllers is a trunk Multiple level 3 controllers can be connected to a level 2 controller with a separate trunk The maximum allowable length of a communications trunk is 5000 feet For a typical network which includes an ASC 100 a Network Master Panel NMP is the level 1 controller and the ASC 100 and other unit controllers are level 2 controllers Cable Specification The network communications cable must meet the following minimum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent IM 657 1 IM 657 1 Some local codes or applications may reguire the use of plenum rated cable Do not install the cable in the same conduit with power
5. Inputs Input Switch Selection When wiring to the analog or digital input device is complete select the type of input using the Input Switches see Figure 4 located on the MCB In Figure 12 IN 0 is connected to an analog input such as a sensor therefore Input Switch SWO is set to Thermistor IN 3 is connected to a digital input therefore Input Switch SW3 is set to Contact 17 18 Figure 12 Analog Digital Inputs Field Wiring Connection 29448889 9bbObOOOD Field Wiring Terminal Board Input Switches swo SW1 SW2 SW3 sw4 SW5 SW6 SW7 SUL 00090000 Thermisto 4 20 MA 0 5 Vde Contact Analog Input Digital Input Digital Outputs When connecting any digital output to the ASC 100 the field wiring connection is made at the Field Wiring Terminal Board see Wiring Instructions below A maximum of eight digital outputs can be wired to the ASC 100 On the Field Wiring Terminal Board terminal blocks TB1 TB2 and TB3 contain screw terminals for wiring digital outputs The digital outputs can be wired for normally open contacts see Figure 13 or normally closed contacts see Figure 14 IM 657 1 IM 657 1 Figure 13 Digital Output Normally Open Contacts Relay for Digital Output TB2 KELLER Normally Open Field Wiring Terminal Board CU 00000000 Digital Output Figure 14 Digital Output Normally Closed Contacts Relay for Digital Output TB2 AEKEZAKKEX
6. It is best to connect a PC to a level 1 controller because faster data transmission results however a PC can be connected to any level 2 controller that does not have level 3 controllers associated with it Either way the PC has access to the entire network see note below In the typical application the NMP is a level 1 and the ASC 100 is a level 2 See Network Communications above for more on network architecture IM 657 1 Itis possible to connect two or more PCs to the network but only one PC can be connected to any one controller The PC that is used most often should be connected to the level 1 controller for better performance For example you may have one PC at the building that you use during the week and another PC at home that you occasionally use on weekends In this situation you may want to connect the on site PC to the level 1 controller and the modem for the off site PC to a level 2 controller Note If a PC is connected to a level 2 controller a level 1 controller must be set up to poll that level 2 controller so that the PC has access to the entire network For information on how to set up the level 1 controller to poll the level 2 controller see the operation manual for the particular controller being used Direct Connection An RS 232 communications cable kit allows a PC to directly connect to any MicroTech controller It is available from McQuay International The cable has a female DB9 connector for connection t
7. a problem with the MCB Following are troubleshooting procedures for the various symptoms Reset and Watchdog LEDs Remain On If the Reset and Watchdog LEDs remain on after the 5 second self test period it is likely that the MCB is defective This also can occur in some instances if there is a power supply problem Refer to Troubleshooting Power Problems below Red and Green LEDs Off If all the LEDs do not turn on after power is applied to the controller there is likely a defective component or a problem in the controller s power distribution circuits Refer to Troubleshooting Power Problems below Troubleshooting Power Problems The MCB receives 18 Vac center tapped power through transformer T2 Power problems can be caused by a defective component which can either blow a fuse or create an excessive load on the power supply An excessive load can lower the power supply voltages to unacceptable levels Use the following procedure to isolate the problem Note that this procedure may require a spare MCB fuse see parts list Refer to the panel wiring diagram 1 Verify that circuit breaker CB1 is closed 2 Remove the MCB Power connector see Figure 17 3 Check for 9 Vac between terminals 2 and 3 on the plug Readings of 9 12 Vac are acceptable a If 9 Vac is present between the terminals go to step 4 b If 9 Vac is not present between the terminals go to step 5 4 Check for 9 Vac between terminals 1 and 3 on the plug
8. desired the factory can download the correct software into the replacement MCB prior to shipment See the MCB Replacement section above for more information 23 McQuay 13600 Industrial Park Boulevard P O Box 1551 Minneapolis MN 55440 USA 612 553 5330
9. output to the ASC 100 The digital outputs are labeled Output 0 through Output 7 Each output consists of three screw terminals For example Output 0 includes screw terminals TB1 1 TB1 2 and TB1 3 If the output is to be normally open screw terminals and 2 are used If the output is to be normally closed screw terminals 2 and 3 are used For more information see Digital Outputs in the Field Wiring section of this manual Power Auxiliary power sources are available at screw terminals TB3 25 and TB3 26 13 Vdc and screw terminals TB4 36 and TB5 37 5 Vdc These terminals can be used to power peripheral devices IM 657 1 IM 657 1 Figure 5 Field Wiring Terminal Board Hardware by others Optional PC Cor Legend Factory wiring _ Field wiring terminal f Field wiring Twisted shielded pair cable with drain wire Screw Chiller 2 ASC Phoenix Applied Rooftop Unit Connector a0194 Software ID MicroTech software for the ASC 100 is custom configured for each application The software is field installed in each panel The software is identified by a program code also referred to as the Ident The program code is encoded in the controller s memory and is available for display by using a PC equipped with Monitor software MicroTech Monitoring and Networking Options PC Monitoring A PC personal computer equipped with the appropriate Monitor software can be u
10. a If9 Vac is present between the terminals go to step 6 b If 9 Vac is not present between the terminals go to step 5 5 Check transformers T2 and T1 and all wiring between the 115 Vac source and the MCB Power connector Remove power from the controller by opening circuit breaker CB1 Check the MCB power supply input fuse F1 with an ohmmeter A good fuse has negligible resistance across it less than 2 ohms a If the fuse is blown replace it Go to step 8 b If the fuse is intact the MCB is defective 8 Reconnect the MCB Power connector cycle power to the controller close and then open CB1 and then check the power fuse again a Ifthe fuse is blown the MCB is defective IM 657 1 21 22 Figure 17 MCB Power Connector Troubleshooting Analog Digital Inputs If the MCB appears to be functioning properly and the analog input or digital input is not being read by the MCB perform the following procedure Try cycling power to the controller by opening and then closing circuit breaker CB1 2 Check the Input Switches to see if they correspond to the type of input connected to the Field Wiring Terminal Board Power must be off when changing a position of an Input Switch 3 Check the edge card connection between the MCB and the Field Wiring Terminal Board and the field wiring connections from the analog or digital input device Look for bent pins or miswires Restore power after reconnecting the Field Wiring Termina
11. by a sheet metal barrier The power wiring should enter the high voltage section The communications wiring should enter the low voltage section Wiring penetrations must be made only through the 7 s inch knockouts provided Note High voltage wires should not pass through the low voltage section and the low voltage wires should not pass through the high voltage section Power A WARNING Electric shock hazard Can cause personal injury or death This equipment must be properly grounded All protective deadfront panels must be reinstalled and secured when power wiring is complete The ASC 100 panel requires a 115 Vac power supply The supply connects to terminals L1 and L2 in the high voltage section The panel must be properly grounded by connecting the ground lug GRD to earth ground Refer to Figure 7 Power wiring must be sized to carry at least 5 amps To gain access to the high voltage section remove the deadfront barrier It is attached to the panel with two 16 inch hex screws Replace this deadfront when the wiring is complete A 0 5 amp circuit breaker CB1 located at the right side of the panel in the high voltage section internally protects the panel The push button circuit breaker also acts an on off switch for the panel Pushing the button in energizes the panel Pushing the button again de energizes the panel Note A white ring on the switch shaft indicates when the panel is de energized Network Communications
12. d must be replaced the proper controller software must be loaded into the replacement MCB This can be done at the building site if a PC equipped with appropriate Monitor software is available or the MicroTech panel is equipped with a modem Job specific Monitor software includes each unit and auxiliary controller s program Therefore it is possible to download the proper controller software to a replacement MCB at the building site if a PC equipped with that job s Monitor software is available IM 657 1 IM 657 1 In addition if the controller s configuration data was stored on the PC hard drive prior to the MCB failure the exact configuration data can be restored Refer to the user s manual supplied with the Monitor software for more information A MicroTech panel equipped with a modem allows the downloading of the proper controller software via a phone line McQuayService or MicroTech engineering can connect to the modem and download the proper controller software to the new MCB Parts List Component Description Designation MCB CO Microprocessor Control Board Field Wiring Terminal Board Tl Transformer 115 24 Vac T2 Transformer 24 18 Vac Center Tapped CB1 Circuit Breaker Fl Fuse MCB Input Power 1 5 Amp Bussman No GDC 1 5A PC Communications Cable Kit MicroTech Modem Kit Notes 1 Part No 658144B 01 658102B 01 606308B 01 467381B 14 7350733 03 658296A 01 0057186802 0072140601 If
13. e for indoor use only Table 3 lists the allowable temperature and humidity ranges Locate the panel at a convenient height and allow adeguate clearance for the door swing Mount the panel to the wall with screws or bolts Four 4 inch openings are provided at the corners of the panel The panel weighs approximately 50 Ib 22 5 kg Figure 6 shows the panel dimensions The ASC 100 panel is equipped with special door hinges that have a friction adjustment screw By adjusting this screw you can prevent the panel door from swinging open or closed unexpectedly Table 3 ASC 100 Panel Environmental Specifications Panel State Temperature Relative Humidity Operating 30 100 F 10 90 noncondensing In storage 0 125 F 10 90 noncondensing Figure 6 ASC 100 Panel Dimensions 7 8 22 Dia knockouts 4 on left and right sides A 1 4 6 4 Dia mounting slots 2 18 1 4 464 D 50 8 Sa 1 4 6 4 Dia 2 4 1 8 104 75 Left Side View Front View 7 8 22 Dia knockouts 4 on top and bottom Bottom View IM 657 1 1 12 Field Wiring Following are descriptions of the various field wiring reguirements and options A typical field wiring diagram is shown in Figure 7 Wiring must comply with the National Electrical Code and all local codes and ordinances The warranty is void if wiring is not in accordance with these instructions The panel is divided into high and low voltage sections
14. e power to the controller A 0 5 amp circuit breaker protects the controller against power surges and over voltages These major components are mounted inside a NEMA enclosure Figure 1 MicroTech ASC 100 Panel Layout Microprocessor Control Board Figure 2 shows the Microprocessor Control Board MCB It contains a microprocessor that has custom software written to monitor and control the equipment connected to the ASC 100 This custom software is normally loaded into the MCB at the job site The various MCB connections and components are described below Figure 2 Microprocessor Control Board MCB Electromechanical Relays Hex Switches Reset LED Output Status LEDs Communications P ons Status LED Watchdog LED Digital Input Input Switches Status LEDs a0191 Hex Switches The MCB includes two hex hexadecimal switches that are used to set the ASC 100 controller s network address The HI and LO hex switches are shown in Figure 3 hex switch setting 01 shown A hex switch setting is defined as the HI switch digit followed by the LO switch digit For example a hex switch setting of 2F would have the HI switch set to 2 and the LO switch set to F In most cases the ASC 100 s hex switch setting is set between 01 and 40 level 2 Note To change the setting of a hex switch use a Ys2 inch tip slotted blade screwdriver Insert the screwdriver into the slot on the hex switch then turn it to the positi
15. ech Series 100 Application Specific Controller ASC 100 It describes the ASC 100 s components field wiring requirements and service procedures The versatile ASC 100 controller monitors and controls a variety of mechanical and electrical environmental equipment in a MicroTech building automation system BAS The ASC 100 uses custom configured software written for each application This provides the customers with a wide range of options for monitoring and controlling their HVAC equipment AN WARNING Electric shock hazard Can cause personal injury or eguipment damage This eguipment must be properly grounded Connections and service to the MicroTech control panel must be performed only by personnel that are knowledgeable in the operation of the eguipment being controlled A CAUTION Static sensitive components A static discharge while handling electronic circuit boards can cause damage to the components Discharge any static electrical charge by touching the bare metal inside the control panel before performing any service work Never unplug any cables circuit board terminal blocks or power plugs while power is applied to the panel NOTICE This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with this instruction manual may cause interference to radio communications It has been tested and found to comply with the limits for a Class A digital device pursuant to pa
16. emote location The following features are provided by the optional NMP e Remote unit monitoring e Advanced scheduling features e Advanced alarm management e Global operator override by unit type e Demand metering e Historical electrical data logging For further information contact your McQuay sales representative Table 2 PC Specification Preferred Configuration Pentium processor or better 16 MB of RAM or better 340 MB hard disk drive or better 342 floppy disk drive Serial port 9 pin male Parallel port Internal time clock battery backed Super VGA graphics capability Super VGA monitor Printer Bus mouse or trackball 101 enhanced keyboard 9600 baud modem compatible with the AT command set optional Microsoft Windows 95 98 MicroTech Monitor for Windows software Minimum Configuration 386SX processor 16 MHz 4 MB of RAM 60 MB hard disk drive 342 floppy disk drive Serial port 9 or 25 pin male Internal time clock battery backed VGA graphics capability VGA monitor Serial mouse or trackball 101 enhanced keyboard 1200 baud modem compatible with the AT command set optional MS DOS 5 0 Microsoft Windows 3 1 MicroTech Monitor for Windows software Ifa serial pointing device is used there must be another serial port available for connecting the PC to the MicroTech controller IM 657 1 Installation Panel Location and Mounting The ASC 100 panel is suitabl
17. input signal is present There are eight Digital Input Status LEDs located below the input switches see Input Switches below e The Reset LED illuminates for 5 seconds when power is applied to the MCB The LED s location is on the right side of the MCB mounting plate e The Status LED indicates when the MCB is operational and ready to communicate by flashing e The Watchdog LED operates the same as the Reset LED Input Switches The input switches select the type of input signal connected to the Field Wiring Terminal Board see Figure 4 There are eight input switches with each switch having four positions thermistor 4 20 mA 0 5 Vdc or contact For example if the device connected to input 0 is a thermistor type input input switch SWO is set to position 1 Switches SW1 through SW7 are set the same way depending on the type of input that is field wired to the Field Wiring Terminal Board Figure 4 Input Switches INPUT SWITCHES SWO SW1 SW2 SW3 SW4 SW5 SW6 SW7 THERMISTOR POS 1 4 20 mA POS 2 0 5 Vde POS 3 CONTACT POS 4 Communication Ports The MCB contains two communication ports port A and port B Each port includes three terminals The Port A Select switch located below the hex switches enables the user to select RS 232 or RS 485 data transmission for port A Moving the switch to the left position sets up RS 232 data transmission while moving the switch to the right sets up RS 485 data transmission The MCB u
18. l Board and any disconnected wires 4 Ifthe problem persists try swapping a known good Field Wiring Terminal Board analog input device or digital input Swap these components separately to isolate the problem Remove power from the controller before disconnecting the suspect component and restore power after connecting the replacement component If the problem persists it is likely that the MCB is defective Troubleshooting Digital Outputs If the MCB appears to be functioning properly and the digital output is not functioning properly perform the following procedure 1 Try cycling power to the controller by opening then closing circuit breaker CB1 2 Check the edge card connection between the MCB and the Field Wiring Terminal Board and the field wiring connection from the digital output device Look for bent pins or miswires Restore power after reconnecting the Field Wiring Terminal Board and any disconnected wires 3 Swap a known good electromechanical relay in place of the relay whose output is not functioning properly 4 Ifthe problem persists try swapping a known good Field Wiring Terminal Board or digital output device Swap these components separately to isolate the problem Remove power from the controller before disconnecting the suspect component and restore power after connecting the replacement component If the problem persists it is likely that the MCB is defective MCB Replacement If an MCB board is defective an
19. o the PC s 9 pin serial port If the PC has a 25 pin serial port obtain an adapter The cable length is 12 feet If more length is required a twisted shielded pair cable can be spliced into the kit cable see Cable Specification below If this is done splice the conductors with crimp type butt connectors good or solder best Do not use wire nuts The maximum allowable cable length for direct connection between the PC and a controller is 50 feet If additional length is needed an RS 232 Cable Extension Kit is available from McQuay International see Bulletin No IM 482 RS 232 Distance Extension Remote Connection A voice quality direct dial telephone line is required for remote or off site PC access to the network The phone line should be terminated with a standard RJ 11 modular phone plug A modem enables a remote or off site PC to communicate with the networked controllers via phone lines A modem that can be field installed in a MicroTech controller is available from McQuay International The kit comes complete with a 14 400 bps modem set up for 9600 bps and an interface cable If a remote PC connection is required it is recommended that the modem at the MicroTech controller be supplied by McQuay International Installation and wiring instructions for the MicroTech Modem Kit are included in Bulletin No IM 682 MicroTech Modem Kit This bulletin is included with the kit Cable Specification for Direct PC Connection A pr
20. on reguired If a hex switch setting is changed cycle power to the MCB by opening and closing the circuit breaker located in the power section of the control panel By cycling power the new switch setting is entered into memory Figure 3 Hex Switches LD right hex switch HI left hex switch pom IM 657 1 IM 657 1 Power In Connector The MCB receives 18 Vac center tapped power from transformer T2 through the Power In connector This power drives all logic and communications circuitry Refer to the panel s wiring diagram or Figure 16 for more information Electromechanical Relays The single pole double through SPDT electromechanical relays drive digital outputs connected to the Field Wiring Terminal Board Depending on the wiring setup the relay can be normally open or normally closed see Digital Outputs below See Table 1 for the relay s output ratings Table 1 Maximum Output Ratings Voltage Output Rating 30 Vdc 20 watts resistive 10 watts inductive 30 Vac 30 VA resistive 20 VA inductive LEDs The MCB has the following LEDs Digital Output Status Digital Input Status Watchdog Reset and Status e The Digital Output Status LED is lit when a digital output is activated There are eight Digital Output Status LEDs one for each electromechanical relay When the relay is energized the LED illuminates e The Digital Input Status LED is lit when an input switch is set to Contact and a digital
21. operly terminated twisted shielded pair cable is required to directly connect a PC to a MicroTech controller The cable must meet the following minimum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent It must also be properly terminated to an AMP or Phoenix plug on one end and a female DB9 or DB25 connector on the other See Figures 8 and 9 for AMP cable pinouts and Figures 10 and 11 for Phoenix cable pinouts The DB9 or DB25 connector is for connection to a 9 pin or 25 pin serial port on the PC Note that some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Note The cable included with the PC Communications Cable Kit is terminated with an AMP plug To use an AMP plug on an ASC 100 an adapter cable is needed due to the Phoenix type plug used This adapter cable is included in the PC Communications Cable Kit IM 657 1 15 Figure 8 RS 232 Cable Pinouts for 9 Pin Serial Ports AMP Connector Female DB 9 Figure 10 RS 232 Cable Pinout for 9 Pin Serial Ports Phoenix Connector Phoenix Plug Signa GND d 1 DCD Cake HSH Ce ose e Pers Figure 11 RS 232 Cable Pinout for 25 Pin Serial Ports Phoenix Connector Female DB 25 IM 657 1 IM 657 1 Analog Digital Inputs When connecting any analog
22. or digital input device to the ASC 100 the field wiring connection is made at the Field Wiring Terminal Board see Figure 12 below A maximum of eight analog inputs eight digital inputs or a combination of eight analog and digital inputs can be wired to the ASC 100 On the Field Wiring Terminal Board terminal blocks TB4 and TBS contain screw terminals for the wiring of analog or digital inputs Z CAUTION Ground loop current hazard Can cause equipment damage External 4 20 mA signals must be isolated from any ground other than the MicroTech controller chassis ground If it is not ground loop currents could occur which could damage the MicroTech controller If the device or system providing the external signal is connected to a ground other that the MicroTech controller chassis be sure that it is providing an isolated output or condition the output with a signal isolator Analog Digital Inputs Cable Specifications The cable for analog or digital inputs must meet the following minimum reguirements e Twisted shielded with drain wire except digital inputs e 300 V 60 C e 20AWG e Polyethylene insulated with PVC outer jacket Depending on the application either two conductors Belden 8762 or equivalent or three conductors Belden 8772 or equivalent are required Note that some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Analog Digital
23. rt 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated ina commercial environment Operation of this equipment in a residential area is likely to cause harmful interference in which case users will be required to correct the interference at their own expense McQuay International disclaims any liability resulting from any interference or for the correction thereof IM 657 1 General Description IM 657 1 The MicroTech Series 100 Application Specific Controller ASC 100 is a microprocessor based controller used to monitor and control pieces of hardware that do not have MicroTech controls factory installed Typical applications of the ASC 100 include control of lighting boiler systems circulating pumps and air handlers The ASC 100 s design offers input and output flexibility The ASC 100 supports eight inputs analog or digital and eight digital outputs Component Data Figure 1 shows the control panel layout for the ASC 100 The main components of the control system include the Microprocessor Control Board MCB and the Field Wiring Terminal Board FWTB The MCB contains hex switches power in connector relays status LEDs inputs switches communication ports and a 1 5 amp fuse The FWTB contains terminal blocks with screw terminals for connecting analog digital inputs digital outputs and auxiliary power Transformers T1 and T2 provid
24. sed to provide a high level interface with a MicroTech network see PC specification below Monitor software features a Windows based display multilevel password access and advanced trend logging The PC can be connected to the ASC 100 controller either directly via a single twisted shielded pair cable or remotely via phone lines with an optional modem For more information on connecting the PC to the controller refer to PC Connection in the Field Wiring section of this manual For the most convenience and best operation the PC should be considered dedicated to the MicroTech system However you can exit the Monitor program to perform other tasks without affecting equipment control Refer to the Monitor software user s manual the for more information PC Specification A directly or remotely connected computer can be used for monitoring ASC 100 and unit operation changing setpoints scheduling trend logging downloading software and diagnostics The PC must be an IBM or 100 true compatible Table 2 shows the preferred and minimum PC specifications Network Master Panel The MicroTech Network Master Panel NMP allows the ASC 100 and its associated units to be incorporated into a building wide network with other MicroTech unit and auxiliary controllers In 10 conjunction with a PC and Monitor software it gives the building operator the capability to perform advanced eguipment control and monitoring from a central or r
25. ses Phoenix type connectors for the ports Following are brief descriptions of each port s function Port A Port A TS1 is usually used for communications with an IBM compatible PC using the RS 232 interface standard The PC can be directly connected over a limited distance with a twisted shielded pair cable The default communications rate is 9600 bps For more information see PC Connection in the Field Wiring section of this manual PortB Port B is for MicroTech network communications using the RS 485 interface standard A twisted shielded pair cable should be connected to port B TS2 The communications rate is 9600 bps For more information see Network Communications in the Field Wiring section of this manual Field Wiring Terminal Board Figure 5 shows the Field Wiring Terminal Board The Field Wiring Terminal Board has field wiring terminals for analog digital inputs digital outputs and auxiliary power Analog Digital Inputs Screw terminals on TB4 and TBS enable the user to connect an analog input or a digital input dry contact to the ASC 100 Inputs are labeled IN 0 through IN 7 Each input has two screw terminals associated with it For example IN 0 includes screw terminals TB5 28 and TB5 29 see Figure 5 For more information see Analog Digital Inputs in the Field Wiring section of this manual Digital Outputs Screw terminals on TB1 TB2 and TB3 enable the user to wire a digital
26. ure to perform the network wiring 1 Before beginning verify that the port B plug is disconnected from every controller on the communications trunk being wired These plugs are connected during the commissioning procedure This is a precaution to prevent stray high voltage from damaging the controllers Any voltage greater than 12 V can damage the board s communications drivers 2 Connect the network cable in a daisy chain manner as shown in Figure 7 Use caution to ensure that the correct polarity is maintained at each controller Be sure to connect each cable s shield to the controllers as shown in the figure The positive negative and shield ground conductor must be continuous over the trunk Note Refer to the product specific installation and maintenance manuals to find the correct wiring detail and field wiring connections 13 14 Figure 7 Field Wiring Schematic Typical Network with ASC 100 PC Connection Hot 115 Volts AC Power Supply Fused 15 Amps Neutral Hardware by others Optional Monitor software package Optional PC Communications Cable Kit Legend Factory wiring __ Field wiring terminal Field wiring i Twisted shielded pair cable with drain wire Phoenix Connector BLK a0194 Regardless of whether the PC is connected directly or remotely via phone lines the connection to any MicroTech controller is at port A on the MCB
27. wiring Note Ideally one continuous piece of cable should connect any two controllers This reduces the risk of communications errors If the cable must be spliced use crimp type butt connectors good or solder best Do not use wire nuts Wiring Instructions The network connection to the ASC 100 panel and other level 2 controllers is at port B on their MCBs Microprocessor Control Board As shown in Figure 7 field wiring to port B on these controllers can be accomplished by connecting the network cable to terminals B B and GND in the level 1 NMP to the B B and GND terminals in each of the level 2 unit controllers and finally to the Phoenix connector which plugs into the ASC 100 s port B Refer to the product specific installation and maintenance manuals to find the correct wiring detail Note The unit controller designations shown in Figure 7 Screw Chiller 1 Screw Chiller 2 Applied Rooftop are established by the network address not the physical position of the controller in the daisy chain The networked controllers can be wired in any order For example the NMP Panel could be connected between Screw Chiller 1 and Screw Chiller 2 It is highly recommended that the installing contractor keep track of the physical order of the controllers on the daisy chained trunk by preparing a schedule This facilitates troubleshooting any network communications problems that may occur Use the following proced
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