user`s manual for model pcim4 computer interface module
Contents
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3. or may be out of calibration Calibration of Model PCIM4 simply means adjusting the 5 120 Vdc reference supply for 5 120 002 Vdc Proceed as follows 1 Remove upper cover of the enclosure housing 2 Connect A C power cord and turn unit on 3 Locate the Channel 1 setpoint control on the back of the front panel module Using a 4 1 2 digit 05 accurate digital voltmeter connect the positive red test probe to terminal lug 3 of the setpoint control and the negative black test probe to terminal lug 1 of the setpoint control 4 Locate potentiometer R4 on the L shaped power supply module refer to Power Supply P C Board Assembly drawing KB20001 Adjust potentiometer R4 until the voltmeter reads 5 120 Vdc 002 Vdc 5 Perform Verification of Calibration and Digital Panel Meter Adjustment Calibration is now complete TABLE 2 REAR PANEL CONNECTORS PIN FUNCTION Connector CH2 CH3 and PIN NO FUNCTION Cable Shield 0 5 Vdc Setpoint Flow Signal Common Circuit Common Flow Signal Output Circuit Common 15 Vdc Power No Connection 15 Vdc Power 10 15 No Connection Auxiliary AUX Connector PIN NO FUNCTION CHANNEL 1 Flow Signal Output 1 2 Flow Signal Common 1 3 Flow Signal Output 2 4 Flow Signal Common 2 5 Flow Si
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5. PCIM4 is four channel multi feature modular secondary electronics package designed for use with all Porter Series 100 Mass Flowmeters MFM s and Series 200 Mass Flow Controllers MFC s Model includes Porter s exclusive COM LINK feature two way communicating link computer interface Model PCIM4 also employs Automatic Proportional Tracking APT Mode operation a feature which permits setting the flow rate control in one or more channels to be a fixed ratio of the flow rate control in a reference channel regardless of the process flow rate in that reference channel The four input channels of Model PCIM4 accept the flow signals These signals may be controlled by four manually operated 10 turn setpoint controls located on the front panel or through COM LINK s internal circuitry when enabled In either case control action occurs when the process flow value in a given channel matches its respective setpoint Process flow rates for all channels are displayed on a large bright digital panel meter as a percentage of full scale The range of this meter is from 000 0 to 102 4 percent Manual or COM LINK setpoints for any channel may also be displayed on the panel meter in the same percentage of full scale flow units Setpoints are adjustable to any value in the previously stated range using the panel mounted 10 turn adjustment controls or by a computer via COM LINK Model is completely self contained with i
6. Shifting the decimal point two places to the right enables the meter to read 100 0 for a 1 000 Vdc flow signal input The CHANNEL SELECTOR switch is a four position two pole rotary switch which establishes a two column binary code 2 and 2 to program the appropriate coding inputs on IC U3 of the Signal Conditioning COM LINK Module The FLOW SETPOINT push button switch selects flow signals binary 1 in the 2 column setpoint levels binary 0 in the 2 column Setpoint potentiometers are 10 turn controls which provide a continuous 0 to 5 120 level to the inputs of IC U2 noted above as well as the field located MFC s Keep in mind the 5 120 divided down 5 1 equals 1 024 Vdc which in turn equals a displayed value of 102 4 on the digital panel meter Refer to the theory discussion on the Signal Conditioning COM LINK Module for further details OPERATION OF EQUIPMENT General Information As previously mentioned the Porter Computer Interface Module Model PCIM4 is used 1o provide a digital display of flow signals for Porter Series 100 5 or to provide both flow signal digital display and setpoint control action for Porter s Series 200 Control action of the Model PCIM4 may take place in the Normal Mode or APT Automatic Proportional Tracking Mode Normal mode occurs when the setpoint control in each channel is connected to a precise and fixed internal reference voltage The SETPOINT Control
7. 4 or channel 3 channel 4 only Channel 1 of course is always referenced to the internal 5 120 Vdc reference voltage The possible combinations for referencing are as follows CH2 to CH3 to to or CH4 to CH3 This arrangement relates to the APT Mode control feature discussed in various sections of this manual The four individual channel input output connectors 1J1 through 144 located on the rear panel are designated CH1 CH2 etc and connect to the previously mentioned 26 pin connector 1J6 via circuit paths on the Interconnect PC board The 15 Vde and 15 Vdc supplies along with the 45 120 reference voltage enter the Interconnect PC board via connector 147 and exit via 1J1 through 1J4 Connector 145 is designated AUX and is mounted on the rear panel It supplies input COM LINK setpoint signals plus 0 to 5 Vdc flow signals to external meters recorders etc when required The last items to be noted here are the ON OFF power switch and power line FUSE also located on the rear panel Front Panel Module Refer to schematic diagram KB19707 The digital panel meter CHANNEL SELEGTOR switch display FUNGTION flow local setpoint remote setpoint switch COM LINK enabling switch and SETPOINT controls through along with their respective cable connector assemblies make up the Front Panel Module The actual range of the digital panel meter is zero to 1 999 Vdc
8. 40 percent of full scale flow In addition Channel 4 can track Channel 3 in the same manner The major advantage of APT Mode operation in this case is that even if the flow rate in Channel 1 falls below its control limits Channel 2 s flow rate will remain a fixed ratio or proportion 80 percent of Channel 1 s flow rate COM LINK Operation Set the COM LINK enabling switch to the REMOTE ENABLE position The COM LINK indicator lights will show which channels the interfaced computer has chosen to control Let us assume only and indicator lights are illuminated indicating and CH3 setpoints are computer controlled This means the setpoints for channels 2 and 4 are being supplied by the CH2 and CH4 10 turn SETPT pots on the front panel If the computer has a major problem or power failure assume different power sources for Model PCIM4 and computer setpoint control for and as given in the example above revert to LOCAL front panel SETPT potentiometers for the channels in question This feature makes COM LINK s operation fail safe APT and COM LINK Operation Combining and operational features requires no special manipulation of controls Simply follow the operating description given previously for each one individually The major difference will be that the computer is controlling some or all of the setpoints rather than the manually controlled front panel 10
9. M LINK signals reference to REM Logic common This common is not connected to Model PCIM4 power or signal common within Model PCIM4 READY RDY Active low when COM LINK ENABLE switch is REMOTE ENABLE position transistor open collector when COM LINK ENABLE switch is in LOCAL ENABLE position sat 1 4ma sink V max 30v I max 50ma Power Dissipation 50mw NOTE RDY line has 100 o current limiting resistor for opto coupler protection REMOTE CONTROL ENABLE REM CONT ENAB Channels 1 through 4 1 Active high input when COM LINK ENABLE switch is in REMOTE ENABLE position inactive when COM LINK ENABLE switch is in LOCAL ENABLE position V min 45V I min min 4 5V 5018 V max 15V I max V max 15V 20 FLOW SIGNAL OUTPUT Channels 1 through 4 1 8 V out Oto5V Source resistance 1000 NOTE Signal referenced to corresponding channel signal common SETPOINT INPUT Channels 1 through 4 1 2 V 0105V Load resistance 10 000 o NOTE Signal referenced to Model PCIM 4 power common THEORY OF OPERATION General Flow signals from individual MFM s and or MFC s are processed by Model PCIM4 for digital display of flow rates in percentage of full scale and if user selected APT operation of MFC s When using setpoint s whether potentiometer or computer generated may also be displayed Computer generated setpoints are ac
10. OCAL SP U2 1 0 0 1 2 0 1 5 3 1 0 2 4 1 1 4 REMOTE SP U2 1 0 0 12 2 0 1 14 3 1 0 15 4 1 1 11 FLOW U1 1 1 COM U1 1 1 11 LOCAL SP U1 5 0 1 5 COM 01 0 1 14 REMOTE SP U1 1 0 2 COM Ut 1 0 15 Suppose a binary code of 10 is applied to the address inputs of U3 by the CHANNEL SELECT switch First look at the chart of Table 1 and then check the two poles of the CHANNEL SELECT switch It can be seen that channel 35 flow and common are being selected because switch pole 1 holds input A pin 10 at ground Input pin 9 is held high 12V by its 10K pull up resistor Leaving the FUNCTION switch in its center or FLOW position produces a binary code of 11 at Ut s address inputs by virtue of both pull up resistors being active However when the display FUNCTION switch is pressed to its LOCAL SP position the address code changes to 10 at B and A respectively The FUNCTION switch now holds B at ground while A is held high 12V by its 10K pull up resistor Let us presume flow signal has been selected by IC U1 The 5 maximum flow signal at the output of unity gain buffer U4A is divided down to 1 maximum signal by resistors and R4 The common return line reference level for flow signal is fed from unity gain buffer U4B to a resistor network consisting of R1 R2 and zero control R6 This control R6 adjusts the common return line level to exactly zero volts with no flow signal applied Si
11. USER S MANUAL FOR MODEL PCIM4 COMPUTER INTERFACE MODULE Parker Hannifin Corporation Porter Instrument Division PORTER 245 Township Line Rd P O Box 907 Hatfield 19440 0907 USA 215 723 4000 fax 215 723 2199 FM 280 Rev C 6 07 TABLE OF CONTENTS PRODUCT DESCRIPTION SPECIFICATIONS COM LINK INPUT OUTPUT D C ELECTRICAL CHARACTERISTICS THEORY OF OPERATION General Power Supply Module Signal Conditioning COM LINK Module Interconnect Module Front Panel Module OPERATION OF EQUIPMENT General Information Normal Mode Operation APT Mode Operation COM LINK Operation APT and COM LINK Operation Verification of Calibration Digital Meter Adjustment Equipment Calibration POLICIES AND CERTIFICATE OF WARRANTY FIGURES AND DRAWINGS Switching Code for I C Multiplexers U1 to U3 Table 1 Rear Panel Connectors Pin Function Table 2 Porter Computer Interface Module Internal Interconnection Diagram Dwg FM 281 Power Supply Module Schematic Diagram Dwg KB20000 Power Supply P C Board Assembly Dwg 20001 Interconnect Module Schematic Diagram Dwg KB19704 Signal Conditioning Board COM LINK Module Schematic Diagram Dwg KB19707 PRODUCT DESCRIPTION Porter s Computer Interface Module Model
12. al 1 of 4 analog data multiplexer In a simple sense it may be thought of as a two pole four position electronically controlled switch where each pole selects 1 of 4 inputs in its particular switch section A two bit binary code applied to the address inputs pins 9 and 10 determines which sets of signals are switched to the output More specifically flow signals are applied to the first four inputs U3 The common return lines for these same flow signal levels are applied to the next four inputs of this same U3 A given signal and its common are selected and fed to the input of multiplexer U1 Four local manually controlled setpoints as well as four remote computer controlled setpoints are selected by multiplexer U2 on its first group of four and second group of four inputs respectively Its address code inputs pins 9 and 10 are operated by the same code lines which control U3 s input switching The front panel CHANNEL SELECT switch determines this code thus selecting one local and one remote setpoint signal to be fed to multiplexer U1 s input Note that the common return for all local and remote setpoint signals is the standard power supply common buss Details of all binary switching code signals will be discussed later Thus far we have seen that a particular flow signal level along with its common return line have been selected by U3 and one local plus remote setpoint signal have been selected by U2
13. and these sets of signals have been presented to Ut s input Accordingly the front panel display FUNCTION lever type switch is used to select the FLOW signal at its center position or LOCAL setpoint at its one extreme position or the REMOTE setpoint at its other extreme This action is accomplished by its own two bit binary code applied to the address inputs pins 9 and 10 of U1 This IC U1 switches the digital panel meters display from a flow signal to a setpoint signal local or remote Also note that both the local setpoint signals which enter the module by connector 2J5 as well as the remote setpoints which enter via connector 2J7 go to the outside world This means that they are fed from the stated location out to their respective MFC s via relay contacts of K1 through and connector 2J1 Let us consider the working of the binary Switching code for multiplexers U1 through U3 which is defined in the chart of Table 1 Keep in mind that switching code inputs A and B pins 10 and 9 relate to binary weighting columns 2 and 2 respectively An example of flow signal plus its common selection is given for multiplexer U3 Another example for flow or local setpoint selection is given for multiplexer U1 TABLE 1 SWITCHING CODE FOR IC MULTIPLEXERS U1 TO U3 FUNCTION CHANNEL NO BINARY CODE IC PIN B PIN9 A PIN 10 FLOW SIGNAL U3 1 0 0 1 2 0 1 5 3 1 0 2 4 1 1 4 FLOW COM U3 1 0 0 12 2 0 1 14 3 1 0 15 4 1 1 11 L
14. at the channel s which is are to follow or track a given reference channel is are set to the right side or to the dotted line s Considering that Channel 1 is the prime reference always having its setpoint control connected to the internal reference voltage Channel 2 may be switched to track Channel 1 Channel 3 may be switched to track Channel 1 and Channel 4 may be switched to track Channel 1 or Channel 3 a secondary reference channel The important thing to remember when establishing APT Mode operation is to follow the dotted lines associated with the slide switches These lines indicate which channel is tracking a particular reference channel Also note that switching the display FUNCTION FLOW SETPOINT lever switch when the CHANNEL SELECTOR switch is set to display the channel using APT mode operation will now make the panel meter display a given ratio of the referenced channel s flow signal That ratio is of course determined by the setting of the particular SETPOINT control switched into the APT Mode and will be read on the panel meter as a percentage of a percentage Example Model PCIM4 is being operated in the APT Mode with Channel 2 tracking Channel 1 Channel 1 s SETPOINT Control is adjusted to 50 0 percent of full scale flow Channel 2 s SETPOINT Control is adjusted to 80 0 percent of Channel 1 s controlled flow This means that Channel 2 s flow rate should be controlled at
15. complished via the COM LINK interface These functions are accomplished by the following four 4 modular circuit assemblies 1 Power Supply Module 2 Signal Conditioning COM LINK Module 3 Interconnect Module includes interconnect PC board rear panel amp rear panel components 4 Front Panel Module includes digital panel meter selector switches setpoint controls and indicator lights Power Supply Module Refer to schematic diagram KB20000 This module is comprised of a PC board and L shaped chassis which mounts to the PC board and an off board power transformer The power supply provides three regulated supplies 5 15 and 15 plus a precise 5 120 Vdc reference supply They operate all functional circuitry within Model PCIM4 The 5 Vdc supply is specifically intended to operate the digital panel meter The 117VAC primary winding of power transformer X1 is fed from the AC line cord 1 2A line fuse ON OFF switch and a pair of quick disconnect type connectors 3J3 1 and 3J3 2 The 5 Vdc three terminal regulator U1 LM340 5 receives its applied voltage from the ful wave rectifierfiter CR2 and 01 Capacitor C2 serves as a transient suppressor Regulators U2 and U3 LM340 and LM320 form the basis for the dual 15 and 15 supplies positively oriented rectifier diodes part of CR5 apply their full wave voltage to filter capacitor Capacitor C6 acts t
16. ed to by Porter Instrument Division in writing buyer will be subject to cancellation charges to cover the cost of material and or fabrication incurred by Porter Instrument Division to date of cancellation CHANGES OF ORDER minimum of 90 days notice required on all changes to orders and will be subject to rescheduling as a new order at Porter Instrument Division s discretion RETURNS No returns will be accepted unless authorized in writing by Porter Instrument Division and accompanied by a properly completed Returned Goods Authorization All returns are subject to restocking and possible rework charges to be determined by Porter Instrument Division CERTIFICATE OF WARRANTY THIS WARRANTY IS GIVEN IN PLACE OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE NO PROMISE OR STATEMENT MADE BY ANY REPRESENTATIVE OR AUTHORIZED DEALER OF PARKER HANNIFIN CORP SHALL CONSTITUTE A WARRANTY BY PARKER HANNIFIN CORP Parker Hannifin Corporation Porter Instrument Division warrants this equipment to be free from defects in workmanship and materials when used in accordance with applicable specifications and with appropriate maintenance for one 1 year from date of delivery to the customer unless otherwise specified in writing Equipment which malfunctions may be returned shipment prepaid to Parker Hannifin Corporation Porter Instrument Division for test and evaluation
17. gnal Output 3 6 Flow Signal Common 3 7 Flow Signal Output 4 8 Flow Signal Common 4 9 0 5 Vdc Remote Setpoint 1 10 0 5 Vde Remote Setpoint 2 11 0 5 Vdc Remote Setpoint 3 12 0 5 Vde Remote Setpoint 4 13 Circuit Common 14 No Connection 15 Remote Enable Ready RDY 16 Remote Control Enable REM 1 CONT ENAB 17 Remote Control Enable REM 2 CONT ENAB 18 Remote Control Enable REM 3 CONT ENAB 19 Remote Control Enable REM 4 CONT ENAB 20 Remote Logic Common 21 25 No Connection POLICIES PRICES All prices are F O B Hatfield PA and subject to change without notice All merchandise will be invoiced at prices in effect at time of shipment Prices do not include insurance freight taxes or special handling These charges if applicable will be shown separately on invoice Minimum order 30 00 PAYMENT TERMS Net 30 days after invoice date All invoices past due are subject to a finance charge of 11 per month 18 annual rate SHIPMENTS Shipment of merchandise shall at times be subject to credit approval and will be contingent upon fires accidents emergencies acts of God or any other causes which are beyond Porter Instrument Division s control Specifications and dimensions subject to change CANCELLATIONS No cancellations will be accepted on non standard or special merchandise except by payment of full purchase price If buyer requests cancellation of any order or part thereof and is agre
18. gnals present between the two output lines are applied to the digital panel meter via connector 244 Op amp U4C serves as an inverting amplifier with a gain of X1 to convert its 5 12 input signal to 5 12 Vdc output level Both polarities of 5 12 Vdc are required for zero control R6 Op amp U4D is connected as a unity gain buffer to apply a 12 Vdc level divided down from 15 Vdc by resistors R10 and R11 to CMOS multiplexers U1 through U3 as Connector 2 2 supplies the various power supply voltages to the Signal Conditioning COM LINK PC board which are carried through to connector 2J3 for application field located MFM s and or MFC s The COM LINK section of this module consists of five optical isolators US through U9 the control relays associated with four of these isolators K1 through K4 and the four front panel LED indicators labeled on the schematic through Computer signals enter the equipment through the rear panel AUX connector 195 These signals are light beam coupled from internally included LED s U6 through U9 to phototransistors Each relay is wired into an emitter follower circuit arrangement Notice however that the common return line of these circuits do not retum to power supply common directly Instead this connection is completed by the COM LINK enabling switch on the front panel Consider the COM LINK switch has been set to REMOTE ENABLE As a result an isolated cont
19. is then adjusted to a control point given as a percent of full scale flow APT Mode occurs when one or more setpoint controls are connected not to the internal reference voltage but to a selected channel s signal output This scheme permits automatic proportional tracking of the flow signals In other words if Channel 2 s setpoint control is connected to Channel 1 s signal output then Channel 2 s flow rate control becomes a fixed ratio of Channel l s flow rate even if Channel 1 s flow rate falls below its control limits Normal Mode Operation Make sure the Norm APT slide switches on the rear panel are set to the left side or the solid line and reference arrows marked REF FOR INDEP CONT Set the CHANNEL SELECTOR Switch to the desired channel and read the digital panel meter for the process flow signal s percent of full scale Set the FUNCTION FLOW SETPOINT lever switch to display that channel s local setpoint in percent of full scale flow If it is desired to change the setpoint adjust the desired SETPOINT control located on the right side of the front panel until the desired setpoint value is displayed on the digital panel meter APT Mode Operation First read the explanation offered for APT Automatic Proportional Tracking Mode Operation given in the third paragraph under the heading entitled General Information above if you have not already done so Now set the selected Norm APT slide switch es so th
20. nternal modular construction It has been designed with the latest high technology microcircuits although its operation is extremely simple SPECIFICATIONS Function Processes 0 to 5 Vdc flow signal inputs from Series 100 MFM s and Series 200 MFC s to provide read out in percentage of full scale flow and provides setpoint control action Inputs Four 4 channels Inputs flow signal line plus common enter instrument via connectors CH1 through on rear panel Setpoints setpoint potentiometer channel adjustable from 0 to 102 4 F S with its respective 10 turn control or by computer via COM LINK inputs Display Red 3 1 2 digit 0 56 in high digital panel meter with 0 1 resolution Electrical Connections Four 4 15 pin D type connectors one per channel for input and output signals from MFM MFC One 1 auxiliary 25 pin D type connector for remote output signal use and COM LINK connection Automatic Proportional Tracking APT Control Control switches located on rear panel permit fixed internal reference for all setpoint channels or selected signal references for all setpoint channels except Channel 1 CH 1 Operational only in local mode operation Power Requirements 117 VAC 10 50 to 60 Hz 50 watts Line fuse rear panel is rated at 0 5A Slo Blo Dimensions 8 1 2 W x 4 7 8 H x 9 3 4 D Weight 6 lbs COM LINK INPUT OUTPUT D C ELECTRICAL CHARACTERISTICS NOTE All CO
21. o suppress transients Note the negatively oriented rectifier diodes part of are the counterparts of those previously mentioned Likewise capacitors C4 and C5 in parallel plus C7 are the counterparts of C3 and C6 respectively Regulator U4 used to develop the precise reference voltage 5 120 Vdc is an LM317LZ Resistor R1 sets a value of current through R2 by virtue of the fixed voltage across it as established by the output terminals of U4 This current determines the voltage across R2 The total voltage across R1 and R2 is approximately 5 12 volts Adjustment potentiometer R4 and resistor R3 set the junction of R1 and R2 such that the final output voltage across filter capacitor C8 is exactly 5 120 Signal Conditioning COM LINK Module Refer to Schematic diagram KB19707 Several functions are accomplished by the Signal Conditioning COM LINK Module 1 Multiplexing switching four input flow signals and their common returns into a single output meter signal 2 Multiplexing two sets of four setpoint signals into a single output meter signal 3 Interfacing an external computer s setpoint control signals to substitute for the manually controlled setpoints and 4 Various housekeeping Operations which are necessary for proper functioning of this module as well as the overall system Multiplexers U1 through U3 are the heart of the automatic switching section Each one is a type CD 4052 This is a du
22. rol signal is sent to the computer 05 informing it that it may take command of any setpoint in channels 1 through 4 Presume computer signals are applied to CH1 and CH3 Relays K2 and K3 are energized by U8 and U7 respectively A portion of K2 s current drawn by U8 will flow through the front panel CH2 COM LINK indicator light 12 The same is true for indicator light The most important function which takes place however is the relay contacts of K2 and K3 switch from the local and setpoints which enter the module on connector 2J7 In other words the computer is now controlling the setpoints for CH2 and CH3 Interconnect Module Refer to schematic diagram KB19704 All signals to and from the outside world are made via the Interconnect Module Therefore consider this module as an input output PC board with attached connectors and switches mounted to the back panel Four sets of input output signals are available on the 26 pin connector 1J6 Each set relates to a given channel They include 1 0 to 5 Vdc flow input signal 2 its common return 3 the setpoint output signal and 4 an auxiliary control input Also note four slide switches SW1 through SW4 are present in the schematic and are located on the back panel Further note these switches allow the setpoint lines to be connected to the internal 5 120 Vdc reference voltage or to the output signal of channel 1 channels 2 3 and
23. turn SETPT potentiometers Obviously the computer must be pre programmed for this task with APT operation taken into account Verification of Calibration Model PCIM4 is shipped precisely calibrated and ready to use You may check calibration using the digital panel meter if desired Proceed as follows Set the CHANNEL SELECTOR switch to Rotate Channel 18 SETPOINT control fully clockwise Set the FUNCTION FLOW SETPOINT lever switch to LOCAL SP The digital pane meter should display 102 4 percent Digital Meter Adjustment If the digital panel meter reading obtained in the procedure above is not correct you may assume the meter has drifted slightly since the reference supply the basis for the equipment s calibration is considered extremely accurate and stable unless it is malfunctioning Therefore proceed as follows 1 Pop off the meter s red plastic filter bezel This can be done by placing a small thin screwdriver blade under the recess at the bottom center of the filter bezel 2 With CHANNEL SELECTOR switch set to CH1 and Channel 1 s setpoint control fully clockwise switch the FUNCTION FLOW SETPOINT lever switch to LOCAL SP 3 Adjust the meter calibration potentiometer R14 located to the right of the display digits until the meter indicates 102 4 4 Replace bezel Equipment Calibration This procedure should not be necessary but may be conducted if there is reason to believe the equipment is
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