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D8 Series User’s Guide

Chapter 5: Tuning and Control

93

Control Outputs

The controller provides open collector outputs for control. These outputs normally control the
process using solid state relays.

Open collector outputs can be configured to drive a serial digital-to-analog converter (Serial DAC)
which, in turn, can provide 0 to 5VDC, 0 to 10VDC or 4 to 20mA control signals to operate field
output devices.

Output Control Signals

The following sections explain the different control output signals available.

On/Off

When on/off control is used, the output is on or off depending on the difference between the set
point and the process variable. PID algorithms are not used with on/off control. The output variable
is always off or on (0 or 100 percent).

Time Proportioning (TP)

With time proportioning outputs, the PID algorithm calculates an output between 0 and 100 percent,
which is represented by turning on an output for that percent of a fixed, user-selected time base or
cycle time.

The cycle time is the time over which the output is proportioned, and it can be any value from 1 to
255 seconds. For example, if the output is 30 percent and the cycle time is ten seconds, then the
output will be on for three seconds and off for seven seconds. Figure 5.5 shows examples of time
proportioning and distributed zero crossing (DZC) waveforms.

Time Proportioning (30%)

On

Off

0

3

10

Seconds

(Cycle Time = 10)

Distributed Zero

0

1

3

4

6

AC Cycle

Crossing (33%)

Figure 5.5

– Time Proportioning and Distributed Zero Crossing Waveforms

Distributed Zero Crossing (DZC)

With DZC outputs, the PID algorithm calculates an output between 0 and 100 percent, but the
output is distributed on a variable time base. For each ac line cycle, the controller decides whether
the power should be on or off. There is no fixed cycle time since the decision is made for each line
cycle. When used in conjunction with a zero crossing device, such as a solid state relay (SSR),
switching is done only at the zero crossing of the ac line, which helps reduce electrical noise.

Using a DZC output should extend the life of heaters. Since the time period for 60 Hz power is
16.6ms, the switching interval is very short and the power is applied uniformly. DZC should be used
with SSRs. Do not use DZC output for electromechanical relays.

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Содержание Controller Series D8

Страница 1: ...D8 Series User s Guide...

Страница 2: ...y Avertissements Attentions et Remarques AVERTISSEMENT Le r gulateur peut s av rer d faillant avec un r gime de puissance de sortie 0 ou 100 Pour viter tout risque de d c s blessure personnelle endomm...

Страница 3: ...description of the problem Any special instructions Name and phone number of person returning the product 2 Prior approval and an RMA number from the customer service department is required when retur...

Страница 4: ...igital Input Test 31 Sensor Wiring 31 Input Wiring Recommendations 33 Thermocouple Connections 33 RTD Input Connections 34 Voltage Input Connections 34 Current Input Connections 35 Wiring Control and...

Страница 5: ...ple 0 to 5VDC Sensor 71 Autotuning 72 How Does Autotuning Work 72 Prerequisites 72 How to Autotune a Loop 73 Setting Up Alarms 73 Failed Sensor Alarms 73 Process Alarms 75 Global Alarm 76 Setting Up P...

Страница 6: ...igh 110 Input High Signal 111 Input Range Low 111 Input Low Signal 111 Input Filter 112 Control Menu 112 Heat Cool Proportional Band 113 Heat Cool Integral 113 Heat Cool Derivative 114 Heat Cool Manua...

Страница 7: ...rning 138 Failed Sensor Alarms 138 System Alarms 138 Other Behaviors 138 Reading the DeviceNet Indicator Lights 139 Corrective and Diagnostic Procedures 140 Low Power 140 Battery Dead 140 H W Error Ga...

Страница 8: ...ith Mass Termination Option 28 Figure 2 13 Power Connections with the D8 Power Supply 30 Figure 2 14 Termocouple Connections 34 Figure 2 15 RTD Connections 34 Figure 2 16 Voltage Signal Connections 34...

Страница 9: ...roportional Control 88 Figure 5 3 Proportional and Integral Control 89 Figure 5 4 Proportional Integral and Derivative Control 89 Figure 5 5 Time Proportioning and Distributed Zero Crossing Waveforms...

Страница 10: ...2 Address Components 47 Table 3 3 Elementary Data Types 47 Table 3 4 Identity Class and Services 48 Table 3 5 Identity Instance Attributes 48 Table 3 6 Message Router Class and Services 48 Table 3 7...

Страница 11: ...1 Table 4 7 Scaling Values 72 Table 4 8 Parameters Settings for Process Variable Retransmit Example 78 Table 4 9 Parameter Settings for the Primary Loop in the Cascade Example 81 Table 4 10 Parameter...

Страница 12: ...le 7 6 Resistor Locations for Current Inputs 149 Table 7 7 Resistor Values for Voltage Inputs 149 Table 7 8 Resistor Locations for Voltage Inputs 150 Table 7 9 Resistor Locations for RTD Inputs 150 Ch...

Страница 13: ...g by DeviceNet explains how to add the D8 controller to a network and how to access controller data via DeviceNet Chapter 4 Operation and Setup provides instructions about operating and setting up the...

Страница 14: ...e two line 16 character display and touch keypad You can also use it as the key element in a computer supervised data acquisition and control system The D8 can be locally or remotely controlled via it...

Страница 15: ...ontroller s battery backed memory Load a job through the keypad digital inputs or software Each job is a set of operating conditions including set points and alarm limits Nonlinear Output Curves Selec...

Страница 16: ...sor and power inputs Mass Termination DB25 DB25 connection for sensor and power inputs Digital I O Termination Screw Terminals TB18 Screw terminals for digital inputs and outputs Mass Termination SCSI...

Страница 17: ...al block TB50 The D8 is available with an 18 terminal block TB18 in place of the SCSI connector as shown in Figure 1 1 above Nonvolatile flash memory for storage of firmware Battery backed storage of...

Страница 18: ...the D8 Figure 1 3 TB50 D8 Cabling Watlow provides optional cables to support installing the D8 A 50 pin SCSI cable connects the TB50 to the CLS200 Safety Watlow has made every effort to ensure the re...

Страница 19: ...te To prevent death personal injury equipment damage or property damage install external safety shutdown devices that operate independently from the process control equipment With proper approval and...

Страница 20: ...cent or 100 percent power output state To prevent death personal injury equipment damage or property damage install external safety shutdown devices that operate independently from the process control...

Страница 21: ...ency interference can induce noise on sensor wiring Choose locations for the D8 and TB50 such that wiring can be routed clear of sources of interference such as high voltage wires power switching devi...

Страница 22: ...of your system Ensure that there is enough clearance for mounting brackets terminal blocks and cable and wire connections 1 00 in 25 mm 1 98 in 50 mm 10 00 in 254 mm 2 44 in 62 mm Figure 2 2 Clearanc...

Страница 23: ...3 in 92 mm as shown above Use caution the dimensions given here have 0 02 in 0 5 mm tolerances 4 Remove the brackets and collar from the controller if they are already in place 5 Slide the controller...

Страница 24: ...to mount the board Standoffs DIN Rail Mount Figure 2 7 Mounting the TB50 DIN Rail Mounting Snap the TB50 on to the DIN rail by placing the hook side on the rail first then pushing the snap latch side...

Страница 25: ...instructions for mounting information Choose a Class 2 power supply that supplies an isolated regulated 12 to 24VDC at 1A Mounting Environment Leave enough clearance around the power supply so that it...

Страница 26: ...e Connect one end of the input and output wiring shield to earth ground Use copper wire for all connections other than thermocouple sensor inputs Table 2 1 Cable Recommendations FUNCTION MFR P N NO OF...

Страница 27: ...ust place them in a panel with D8 series equipment use a 0 01 microfarad capacitor rated at 1000VAC or higher in series with a 47 0 5 watt resistor across the normally open contacts of the relay load...

Страница 28: ...explains how to make power connections to the D8 and the TB50 J1 Sensor Inputs J2 Power Input SCSI to TB50 Digital Inputs Digital Outputs Figure 2 11 Power Input with Mass Termination Option TB1 Sens...

Страница 29: ...sis ground This terminal is connected to the CLS200 chassis and must be connected to earth ground 5 Connect 120 240VAC power to the power supply NOTE Connect the dc common of the power supply used for...

Страница 30: ...r 1 Turn on power to the D8 The display should read Calculating checksum then show the single loop display If you do not see these displays disconnect power and check wiring and power supply output 2...

Страница 31: ...nt to test See See Table 2 7 TB18 Connections on page 39 or See Table 2 8 TB50 Connections on page 40 for connections a When the wire is connected only to the digital input terminal the digital input...

Страница 32: ...CH3 Channel 3 positive input 8 CH3 Channel 3 negative input 9 Com Analog common 10 CH4 Channel 4 positive input 11 CH4 Channel 4 negative input 12 Com Analog common 13 Not used 14 CH5 Channel 5 posit...

Страница 33: ...nalog Common 1 Terminals 11 to 18 are not used with a 4 loop controller Input Wiring Recommendations Use multicolored stranded shielded cable for analog inputs Watlow recommends that you use 20 AWG wi...

Страница 34: ...D8 uses a floating analog common for sensor measurements The noise protection circuits on the sensor inputs function correctly only if the controller is correctly installed See Ground Loops on page 27...

Страница 35: ...commendations When wiring output devices use multicolored stranded shielded cable for analog outputs and digital outputs connected to panel mounted solid state relays Analog outputs usually use a twis...

Страница 36: ...Digital Output 2 Do not connect External Power TB50 or TB18 Loads Supply TB50 or TB18 to earth ground or equipment ground Figure 2 18 Digital Output Wiring Configuring Outputs As you choose outputs f...

Страница 37: ...them to the negative side of solid state relays Figure 2 19 shows sample heat cool and alarm output connections Cool Output Alarm Output 5VDC SSR SSR SSR TB50 or TB18 Heat Output Figure 2 19 Sample He...

Страница 38: ...ler common Table 2 6 Digital Input States and Values Stored in the Controller STATE VALUE1 DESCRIPTION Off 0 Open circuit On 1 Digital input connected to controller common 1 Read and write these value...

Страница 39: ...store automatic control after a failed sensor has been repaired See Restore Automatic Mode on page 115 TB18 Connections Table 2 7 TB18 Connections TERMINAL FUNCTION CONTROL OUTPUT1 4 LOOP MODEL 8 LOOP...

Страница 40: ...sed 15 Output 4 Loop 4 heat Loop 4 heat 16 Not used 17 Output 5 Loop 5 heat Loop 1 cool 18 Not used 19 Output 6 Loop 6 heat Loop 2 cool 20 Not used 21 Output 7 Loop 7 heat Loop 3 cool 22 Not used 23 O...

Страница 41: ...requirements Also note in the specifications that the Dual DAC does not carry the same industry approvals as the Serial DAC Wiring the Serial DAC The Serial DAC provides a robust analog output signal...

Страница 42: ...ft 125 Kbps Baud Rate Data Rate DeviceNet communications can use three different baud rates data rates 125k 250k and 500k baud When the switch is set to the PGM position the unit s baud rate is deter...

Страница 43: ...ntroller s memory Set the controller s MAC ID with the two rotary switches on the side of the case Set the most significant digit MSD with the left switch and the least significant digit LSD with the...

Страница 44: ...The device has not completed the duplicate MAC ID test yet The device may not be powered Look at Table 2 11 Module Status Indicator Light Green The device is online and has connections in the establi...

Страница 45: ...b site and upon request from Watlow technical support NOTE There are several versions of the EDS file You must use the correct file for the number of loops in the controller d84 file version eds or d8...

Страница 46: ...2 9 999 to 30 000 3 0 9999 to 3 0000 4 To determine the integer value to set in the controller move the decimal to the right the number of places specified For example If a loop has a process input wi...

Страница 47: ...mines its scan list and sends commands accordingly Except for the Duplicate MAC ID Check a slave cannot initiate any communication before being told by the master to do so Addressing All data is refer...

Страница 48: ...PTION 1 1 hex Get VendorID UINT Identification of each vendor by number Watlow has vendor ID 153 2 2 hex Get Product Type UINT Identification of general type of product for vender The D8 has type 0 3...

Страница 49: ...T Baud Rate 0 to 2 3 3 hex Get Bus Off Counter USINT Number of times CAN went to the bs o state 0 to 255 4 4 hex Get Allocation Info STRUCT of BYTE USINT Allocation Information Allocation Choice Byte...

Страница 50: ...of INTs array3 of UINTs Produced Static Input 1 Array size is equal to the number of loops in the controller 4 elements for four loops and 8 for eight loops 2 Array size is equal to the two times the...

Страница 51: ...te Byte Byte Exception Status 1 byte Loop 1 Process Variable INT 2 bytes Loop 2 Process Variable INT 2 bytes Loop 3 Process Variable INT 2 bytes Loop 4 Process Variable INT 2 bytes Loop 5 Process Vari...

Страница 52: ...hex Get Attribute Single 10 hex Set Attribute Single Table 3 15 Connection Instance Attributes ATTRIBUTE ACCESS NAME TYPE DESCRIPTION 1 1 hex Get State USINT State of the object 2 2 hex Get Instance...

Страница 53: ...Get Attribute Single Instance Services 0E hex Get Attribute Single 10 hex Set Attribute Single Table 3 17 Input Class Attributes Instance 0 ATTRIBUTE ACCESS NAME TYPE DESCRIPTION 1 1 hex Get Revision...

Страница 54: ...m instances of this object 8 3 3 hex Get Number of instances UINT Number of object instances Table 3 21 Output Instance Attributes Instances 1 to 4 or 8 ATTRIBUTE ACCESS NAME TYPE DESCRIPTION 100 64 h...

Страница 55: ...e eight loop controller has eight additional instances each containing the attributes listed in Table 3 24 Instance 1 corresponds to loop 1 instance 2 corresponds to loop 2 and so on Table 3 22 Contro...

Страница 56: ...nd so on Table 3 25 Alarm Class and Services Class Code 67 hex Class Services 0E hex Get Attribute Single Instance Services 0E hex Get Attribute Single 10 hex Set Attribute Single Table 3 26 Alarm Cla...

Страница 57: ...ervices Class Code 68 hex Class Services 0E hex Get Attribute Single Instance Services 0E hex Get Attribute Single 10 hex Set Attribute Single Table 3 29 PV Retransmit Class Attributes Instance 0 ATTR...

Страница 58: ...tes Instances 1 to 4 or 8 ATTRIBUTE ACCESS NAME TYPE DESCRIPTION 100 64 hex Get Set Ratio Master Loop USINT See page 129 101 65 hex Get Set Ratio Low Set Point INT See page 130 102 66 hex Get Set Rati...

Страница 59: ...rovides read write access to all global parameters Instance 0 contains the class attributes listed in Table 3 38 Instance 1 contains the attributes listed in Table 3 39 Table 3 37 Global Class and Ser...

Страница 60: ...16 MSB USINT See page 132 115 73 hex Get Set Digital Outputs 17 LSB and 18 and Global Alarm MSB USINT See page 132 116 74 hex Get Ambient Sensor INT See page 134 117 75 hex Get Battery Status BOOL OK...

Страница 61: ...re 4 1 shows how to navigate from the loop display to other displays menus and parameters Loop Display Same Screen on the Next or Previous Loop Scanning Loop Display Hold 3 seconds 01 925 C 1000auto10...

Страница 62: ...o to a different loop Save a change and go to a different loop Go to the scanning loop display hold for 3 seconds Save a change and go to the previous parameter Key Description Toggle between the loop...

Страница 63: ...blank for that loop The scanning loop display sequentially displays the information for each loop The data for each loop displays for one second To activate the scanning loop display go to the loop d...

Страница 64: ...igh deviation alarm Deviation Alarms on page 76 LD No message Low deviation alarm Deviation Alarms on page 76 AW No message Ambient Warning The controller is within 5 C of its operating temperature li...

Страница 65: ...ead The RAM battery in the D8 is not functioning correctly and stored data has been corrupted Battery Dead on page 140 H W error Ambient The temperature around the controller is outside of the accepta...

Страница 66: ...put of one loop to adjust the set point of another loop Setting Up Cascade Control on page 79 Ratio Control Use the process variable of one loop multiplied by a ratio as the set point of another loop...

Страница 67: ...You should be back at the loop display The control mode is shown on the second line of the loop display Table 4 1 Control Modes on page 63 Accessing and Navigating the Setup Menus Use the setup menus...

Страница 68: ...oller determines the appropriate output signal The controller calculates the output signal based on the feedback and the control algorithm Each loop may use either on off control or any combination of...

Страница 69: ...automatic mode Changing the Control Mode and Output Power on page 66 For more information about the setup menus and parameters Chapter 6 Menu and Parameter Reference on page 95 Setting Up a Process I...

Страница 70: ...per square inch PSI Setup Set the scaling parameters in the Input menu as follows For the Input type parameter choose process For the Disp format parameter choose 999 9to 3000 0 because the sensor mea...

Страница 71: ...to 5VDC signal Independent calibration measurements of the flow in the pipe indicate that the sensor generates 0 5V at 3 gallons per minute GPM and 4 75V at 65 GPM The calibration instrument is accur...

Страница 72: ...come constant to determine the integral term The controller mathematically derives the derivative term from the integral term When the controller finishes autotuning a loop it switches the loop to aut...

Страница 73: ...ng limits of your system 5 Access the setup menus see page 67 Go to the Input filter parameter in the Input menu Write down the value and then change it to 0 scans Press to save the new setting 6 Pres...

Страница 74: ...ouple Reversed Alarm The thermocouple reversed alarm occurs if the temperature goes in the opposite direction and to the opposite side of ambient temperature than expected for example a loop is heatin...

Страница 75: ...teresis The alarm output deactivates when the process returns to normal Process Alarm Outputs Any digital output that is not used as a control output can be assigned to one or more process alarms The...

Страница 76: ...pecified amount see Figure 4 7 above You can set separate high and low deviation values at the HiDeviation value and LoDeviation value parameters in the Alarms menu Upon power up or when the set point...

Страница 77: ...h as a PLC Any available heat or cool output may be used as a retransmit output Any process variable may be retransmitted including the input from the same loop To get a 4 to 20mA or 0 to 5VDC signal...

Страница 78: ...nput is a linear 4 to 20mA signal representing a range of 0 F to 1000 F so we will use a 0 percent output signal to represent 0 F PV retrans Ht retrans HighPV 1000 F This is the input value represente...

Страница 79: ...and user specified cascade parameters If the primary loop has both heat and cool outputs then the set point of the secondary loop is equal to the Cascade low SP parameter when the cool output is at 10...

Страница 80: ...so that the set point of the secondary loop has the desired relationship to the process variable of the primary loop See the example below How To Set Up Cascade Control 1 For the primary cascade loop...

Страница 81: ...r T C Inner T C Figure 4 11 Example Application Using Cascade Control Table 4 9 Parameter Settings for the Primary Loop in the Cascade Example MENU PARAMETER VALUE COMMENT none Set point 150 F Desired...

Страница 82: ...percent of 40 F is 4 F So when the temperature at loop 1 drops 1 F the set point of loop 2 increases by 4 F until the output of loop 1 is 100 percent and the set point of loop 2 is 190 F At this poin...

Страница 83: ...loop for optimal performance before implementing the ratio setup 2 For the ratio loop set the parameters in the Ratio menu 3 Configure both the master loop and the ratio loop for inputs outputs and al...

Страница 84: ...low SP 0 0 The minimum ratio loop set point is 0 0 gallons per second GPS Ratio Ratio high SP 7 0 The maximum ratio loop set point is 7 0 GPS Ratio Control ratio 0 5 The H2 0 flow rate 10 GPS is mult...

Страница 85: ...Ratio Ratio low SP 300 0 F The lowest allowable set point for the ratio loop For this example we ll use 300 0 Ratio Ratio high SP 400 0 F The highest allowable set point for the ratio loop For this e...

Страница 86: ...e full scale of 0 to 100 percent Input Input range low 0 F The 0VDC input signal represents 0 F Input Input low signal 0 0 The controller is equipped with a 0 to 5VDC input and the input signal is 0 t...

Страница 87: ...rtional P Proportional and integral PI Proportional with derivative PD Proportional with integral and derivative PID P PI or PID control is necessary when process variable cycling is unacceptable or i...

Страница 88: ...rtional to the process variable s deviation from the set point For example if the set point is 1000 F and the proportional band is 20 F the output power is as follows 0 percent when the process variab...

Страница 89: ...that make the process very slow to reach set point and parameters that make the controller respond quickly but introduce some transient oscillations when the set point or load changes The extent to wh...

Страница 90: ...a loop choose PID parameters that will best control the process This section gives PID values for a variety of heating and cooling applications NOTE Tuning is a slow process After adjusting a loop al...

Страница 91: ...ttings The controller s derivative parameter is programmed in seconds Some other products use a derivative term called rate programmed in minutes Use the table or the formula to convert parameters fro...

Страница 92: ...PID Set the proportional band to ten percent of the set point Example Set point 450 proportional band 45 Set the integral to 60 Set the derivative to 15 percent of the integral Example Integral 60 de...

Страница 93: ...oportioned and it can be any value from 1 to 255 seconds For example if the output is 30 percent and the cycle time is ten seconds then the output will be on for three seconds and off for seven second...

Страница 94: ...h gives a time constant of 0 to 85 seconds for an eight loop controller or 0 to 43 seconds for a four loop controller Use the output filter if you need to filter out erratic output swings due to extre...

Страница 95: ...the operator parameters to change the set point control mode or output power level Cancel a change without saving Escape to the loop display Edit parameter values Save a value and go to the previous p...

Страница 96: ...Table 6 1 Control Modes DISPLAY VALUE DeviceNet VALUE DESCRIPTION manual 0 The operator manually sets the output power for the loop auto 1 The controller automatically controls the outputs according t...

Страница 97: ...Input 64 hex Overview of the Setup Menus The D8 has nine setup menus Table 6 2 provides a brief description of each menu Figure 6 2 lists all of the menus and parameters in the same order that they ap...

Страница 98: ...rate Module LED Network LED Bus off count WATLOW D8x Vx xx cs xxxx Input Input type Loop name Input units Calibration offset Reversed T C detect Disp format Input range high Input high signal Input ra...

Страница 99: ...mode automatic tune off or manual and output power levels if the loop is in manual control Alarm functions set points hysteresis and delay settings If you have enabled remote job selection BCD Job Loa...

Страница 100: ...u have enabled remote job selection BCD Job Load on page 100 you will see the message below and you will not be able to use the controller keypad to save a job lSave setup as r not available Values 1...

Страница 101: ...e which state is considered true for the digital inputs that are used for remote job selection If 1 true is selected then an input is true if connected to controller common and false for an open circu...

Страница 102: ...o enabled by D I8 1 to 8 or disabled 0 Values in parentheses are for communications Default disabled 0 DeviceNet Object Global 6B hex WARNING Do not rely solely on the mode override feature to shut do...

Страница 103: ...p Loop Mode lPower up loop r modeboff Choose the power up state of the control outputs Values See Table 6 5 Default off 0 DeviceNet Object Global 6B hex WARNING Do not set the controller to start from...

Страница 104: ...process power is on but the temperature does not rise as expected If a thermocouple short is detected the controller puts the loop in manual mode at the output power level specified by the Sensor fai...

Страница 105: ...ION on 0 Digital alarm outputs sink current to analog common when an alarm occurs off 1 Digital alarm outputs stop sinking current to analog common when an alarm occurs MAC ID lMAC ID r b63 The node a...

Страница 106: ...DeviceNet Object N A Bus Off Count lBus off count r 0 Indicates the number of times the controller has gone to the bus off state Values 0 indicates the controller has not had a bus off error since th...

Страница 107: ...ermocouple 350 to 1400 F 212 to 760 C K t c 2 Type K thermocouple 450 to 2500 F 268 to 1371 C T t c 3 Type T thermocouple 450 to 750 F 268 to 399 C S t c 4 Type S thermocouple 0 to 3200 F 18 to 1760 C...

Страница 108: ...Degree symbol 223 Percent sign 37 Forward slash 47 Space 32 Pound sign 35 Input Units l01 Input unitsr b F For a thermocouple or RTD input choose the temperature scale For a process input enter a thr...

Страница 109: ...x Table 6 9 Calibration Offset Ranges TYPE OF SENSOR OFFSET RANGE F C RTD 300 0 to 300 0 300 0 to 300 0 J Thermocouple K Thermocouple T Thermocouple 300 to 300 300 to 300 B Thermocouple S Thermocouple...

Страница 110: ...99 to 300 00 2 99 99 300 00 9 999 to 30 000 3 9 999 30 000 0 9999 to 3 0000 4 0 9999 3 0000 Input Range High l01 Input ranger high b 1000 F For a process input enter the high process variable for inpu...

Страница 111: ...isplayed when the input signal is at the level set for Input low signal This value and the value for Input low signal together define one of the points on the scaling function s conversion line Settin...

Страница 112: ...within the specified number of scans One scan is 0 17 seconds for a four loop controller and 0 33 seconds for a eight loop controller Values 0 off to 255 Default 3 DeviceNet Object Input 64 hex Contr...

Страница 113: ...Numeric Values on page 46 DeviceNet Object Control 66 hex Table 6 11 Proportional Band Values TYPE OF SENSOR VALUES IN F VALUES IN C J Thermocouple 1 to 1750 1 to 972 K Thermocouple 1 to 2950 1 to 163...

Страница 114: ...his parameter enter the power level required to maintain set point to compensate for this offset Values 0 to 100 0 to 1000 Values in parentheses are for communications Default 0 0 Decimal Placement fo...

Страница 115: ...nd Deviation Alarm Parameters INPUT TYPE DISPLAY FORMAT VALUES DEFAULT Thermocouple n a 0 to 500 5 RTD n a 0 to 500 0 5 0 Proess 999 to 3000 0 to 500 5 9999 to 30000 0 to 5000 50 999 9 to 3000 0 0 0 t...

Страница 116: ...e Proportioning TP 2 The output is switched on and off once during a user selected cycle time Within each cycle the duration of on versus off time is proportional to the percent output power On Off on...

Страница 117: ...es are for communications Default voltage 0 DeviceNet Object Output 65 hex Heat Cool SDAC Low Signal l01 Ht SDAC lowr signalb 00vdc For a Serial DAC output enter the low output signal level for the Se...

Страница 118: ...Heat Cool Action l01 Heat actionr breverse Choose the control action for the output When the action is set to reverse the output goes up when the process variable goes down When the action is set to...

Страница 119: ...Cool Output l01 Sensor failr heat outputb 0 A loop will switch to manual mode at the specified output power if one of the following conditions occurs while in automatic mode A failed sensor alarm occu...

Страница 120: ...Object Output 65 hex Heat Cool Output Curve l01 Heat outputr curve blinear Choose an output curve If curve 1 or 2 is selected a PID calculation results in a lower actual output level than the linear...

Страница 121: ...igh and Alarm Low on page 76 Values For a thermocouple or RTD input any value within the input range Table 6 7 Input Types and Ranges on page 107 For a process input any value between the Input range...

Страница 122: ...igh Output l01 Alarm high r outputbnone Choose a digital output to activate when the high alarm occurs You cannot choose an output that is in use for closed loop control or for the Serial DAC clock Va...

Страница 123: ...m occurs You cannot choose an output that is in use for closed loop control or for the Serial DAC clock Values none 0 or output 1 to 18 1 to 18 Values in parentheses are for communications Default non...

Страница 124: ...control or for the Serial DAC clock Values none 0 or output 1 to 18 1 to 18 Values in parentheses are for communications Default none 0 DeviceNet Object Alarm 67 hex Alarm Low Set Point l01 Alarm low...

Страница 125: ...t is in use for closed loop control or for the Serial DAC clock Values none 0 or output 1 to 18 1 to 18 Values in parentheses are for communications Default none 0 DeviceNet Object Alarm 67 hex Alarm...

Страница 126: ...yr b 0 sec Use this parameter to delay a failed sensor process and deviation alarms until the alarm condition has been continuously present for longer than the delay time To delay alarms on powerup on...

Страница 127: ...utput signal If the process variable falls below this value the output will stay at 0 percent Values Any value within the input sensor range see Table 6 7 Input Types and Ranges on page 107 Default Th...

Страница 128: ...ions Default none 0 DeviceNet Object Cascade 6A hex Cascade Low Set Point l01 Cascade lowr SP b 25 C Enter the set point to use for the current loop when the output of the primary loop is at its minim...

Страница 129: ...must be greater than the Cascade low SP parameter Default 25 for a thermocouple RTD or process input Decimal Placement for DeviceNet See Decimal Placement for Numeric Values on page 46 DeviceNet Obje...

Страница 130: ...See Decimal Placement for Numeric Values on page 46 DeviceNet Object Ratio 69 hex Ratio High Set Point l01 Ratio high r SP b 25 C Enter the highest allowable set point for the current loop The set poi...

Страница 131: ...cimal Placement for Numeric Values on page 46 DeviceNet Object Ratio 69 hex I O Tests Menu lI O tests r Other menus b Use the I O tests menu to test the following Digital inputs Digital outputs Keypad...

Страница 132: ...Test lDisplay test r press d to begin Displays two screens with alternate pixels lit Press to enter test press or to switch pattern Press x to end the test DeviceNet Object None Test Digital Output 1...

Страница 133: ...ged 1 or acknowledged 0 DeviceNet Object Alarm 67 hex Alarm Enable Enable or disable an alarm Table 6 16 below shows the bit to set or read for each alarm This parameter is available only via communic...

Страница 134: ...the bit to read for each alarm This parameter is available only via communications Values Not active 0 or active 1 DeviceNet Object Alarm 67 hex Table 6 17 Bit Positions for Alarm Status and Alarm Ac...

Страница 135: ...t Status Indicates whether the zero self calibration measurement falls within acceptable limits 0 In calibration 1 Out of calibration Global 6 Hardware Gain Status Indicates whether the full scale sel...

Страница 136: ...help If you need to return the unit to Watlow for testing and repair Customer Service will issue you an RMA number See Return Material Authorization RMA on page 3 CAUTION Before trying to troubleshoot...

Страница 137: ...ations similar issues cause high alarms In a heating application a high alarm or high deviation alarm may indicate one of the following The process set point and high alarm set point have been lowered...

Страница 138: ...problem it displays an alarm message and with the exception of the Low Power alarm turns on the global alarm output The global alarm remains on until the alarm is acknowledged The message persists unt...

Страница 139: ...ercent power Intermittent power Check wiring and service See Wiring the Power Supply on page 28 Use a separate dc supply for the controller Provide backup power uninterruptible power system In the Glo...

Страница 140: ...er If the controller displays Low power or the display is not lit 1 Turn the power to the controller off then on again 2 If the Low power alarm message returns check that the power supplied to the con...

Страница 141: ...e RAM See Clearing the RAM on page 145 3 If the alarm is not cleared contact your supplier for further troubleshooting guidelines See Return Material Authorization RMA on page 3 NOTE If the controller...

Страница 142: ...heck whether there is an unacknowledged alarm The keys will not work for anything else until all alarms are acknowledged To acknowledge an alarm press x Checking Analog Inputs 1 If the process variabl...

Страница 143: ...rical codes With ac power on measure for ac voltage that may be present between control panels chassis grounds Any ac voltage above 2VAC may indicate problems with the ac ground circuit With the heate...

Страница 144: ...500 to 100 k resistor between the 5V terminal TB18 or TB50 terminal 1 and the output terminal you want to test 4 Connect the voltmeter s common lead to the output terminal and connect the voltmeter s...

Страница 145: ...M power down the controller and remove the jumper wire from the keypad header before putting the controller back in service Replacing the EPROM Replacing the EPROM involves minor mechanical disassembl...

Страница 146: ...that latch the two boards in the carrier at side with the ribbon cable and rotate the boards out of the carrier as shown in Figure 7 3 Figure 7 3 Unlatch Boards from Carrier 7 Remove the two plastic s...

Страница 147: ...the Battery The lithium battery in the battery backed RAM module on the processor board should be removed and disposed of properly if decommissioning the controller It may also be replaced if needed d...

Страница 148: ...ts on the D8 Inputs with signal ranges between 10 and 60mV use 0 resistors in the RC position only All other input signals require special input scaling resistors NOTE Scaling resistors cannot be chan...

Страница 149: ...w Table 7 5 Resistor Values for Current Inputs INPUT RANGE RESISTOR VALUE RD 0 to 20mA 3 0 Resistor tolerance 0 1 RP RD Table 7 6 Resistor Locations for Current Inputs LOOP RESISTOR LOCATION RD LOOP R...

Страница 150: ...RP3 4 R52 RP4 5 R50 RP5 6 R48 RP6 7 R46 RP7 8 R44 RP8 RTD Inputs Each RTD input has three scaling resistors installed one each at RA RB and RC for the input RA and RB are a matched pair of resistors...

Страница 151: ...for thermocouple RTD and other fixed ranges and offset and span gain calibration for process inputs In order to scale the input signal you must 1 Have appropriate scaling resistors installed 2 Enter...

Страница 152: ...D8 Series User s Guide Chapter 7 Troubleshooting and Reconfiguring 152...

Страница 153: ...ller consists of a processor module with a 50 terminal block TB50 or a processor module with an 18 terminal block TB18 Table 8 1 Agency Approvals Compliance CE Directive Electromagnetic Compatibility...

Страница 154: ...88 mm Figure 8 1 D8 Module Dimensions Without Cables Table 8 3 D8 with Standard SCSI Length 10 0 to 10 5 inches 254 to 267 mm Width 3 80 inches 96 mm Humidity 10 to 95 non condensing 50mm Exact requir...

Страница 155: ...Power Terminal Torque TB2 4 4 to 5 3 in lb 0 5 to 0 6Nm Sensor Terminals TB1 Captive screw cage clamp Sensor Wire Gauge TB1 Thermocouple 20 AWG 0 5 mm2 Process 22 to 20 AWG 0 5 mm2 Communications 24 A...

Страница 156: ...4 mm 0 92 in 23 mm Figure 8 5 TB50 Dimensions Table 8 6 TB50 Connections Screw Terminal Torque 4 4 to 5 3 in lb 0 5 to 0 6Nm SCSI Connector on Board SCSI 2 female Output Terminals Captive screw cage c...

Страница 157: ...200ms at 50 Hz Eight loop models 3 Hz 333ms at 60Hz 2 5Hz 400ms at 50 Hz Miliampere Inputs 0 to 20mA 3 resistance with scaling resistors Voltage Input Ranges Available 0 to 10V 0 to 5V with scaling re...

Страница 158: ...268 to 1 371 2 4 1 3 3 8 2 1 T 450 to 750 268 to 399 2 9 1 6 5 8 3 2 S 0 to 3 200 18 to 1 760 5 0 2 8 8 8 4 9 R 0 to 3 210 18 to 1 766 5 0 2 8 8 8 4 9 B 150 to 3 200 66 to 1 760 7 2 4 0 22 1 12 3 E 3...

Страница 159: ...ded so that an external device can monitor the CPU state Analog Outputs Contact your supplier or Watlow for more information on these accessory products Contact your supplier or Watlow for more inform...

Страница 160: ...utput Power to Operate Solid State Relays Voltage 5VDC Maximum Current 350mA Table 8 15 Communications Minimum Time Between Polled I O Requests 20ms Table 8 16 D8 Power Requirements Voltage 15 to 24 3...

Страница 161: ...mbient Temperature The temperature of the air or other medium that surrounds the components of a thermal system American Wire Gauge AWG A standard of the dimensional characteristics of wire used to co...

Страница 162: ...er DeviceNet classes define what attributes and services objects of that type have Class services are used to examine and change class attributes Closed Loop A control system that uses a sensor to mea...

Страница 163: ...l action in which an increase in the process variable causes an increase in the output Usually used with cooling applications Direct Current DC An electric current that flows in one direction Distribu...

Страница 164: ...within the numbers of scans that are set Frequency The number of cycles over a specified period of time usually measured G Gain The amount of amplification used in an electrical circuit Gain can also...

Страница 165: ...s that can be stored and recalled in a controller s memory Also called a recipe Junction The point where two dissimilar metal conductors join to form a thermocouple K Keypad Lock A feature that preven...

Страница 166: ...set point and process variable Output Type The form of control output such as time proportioning distributed zero crossing Serial DAC or analog Also the description of the electrical hardware that ma...

Страница 167: ...n the output Heating applications usually use reverse action RTD See Resistance Temperature Detector S Serial Communications A method of transmitting information between devices by sending all bits se...

Страница 168: ...ptable signal degradation U Undershoot The amount by which a process variable falls below the set point before it stabilizes V Volt V The unit of measure for electrical potential voltage or electromot...

Страница 169: ...t temperature Ambient Sensor Reading 60 134 H W error Ambient alarm 141 operating range 21 153 Ambient Warning 138 analog output see also Dual DAC or Serial DAC 94 Application Objects 46 Assembly Obje...

Страница 170: ...Action 54 118 Cool Cycle TIme 54 117 Cool Derivative 55 114 Cool Filter 56 114 Cool Integral 55 113 Cool Manual Reset 55 114 cool message on loop display 63 Cool Output Action for Watchdog 55 Cool Out...

Страница 171: ...xplicit messages 44 47 49 52 54 140 external bridge circuit 34 external safety devices 18 F Fahrenheit 108 failed sensor alarms behavior of 138 codes 63 64 messages 63 64 output power if sensor alarm...

Страница 172: ...ters 107 specifications 157 input scaling 69 Input Type 53 107 Input Units 53 108 installation 20 alarm wiring 37 clearance 22 154 controller 22 control output wiring 37 digital output wiring 35 envir...

Страница 173: ...ital input Active 59 102 Modes 50 Module LED parameter see also Module status indicator 106 Module Status Indicator 41 44 106 139 N Network LED parameter see also Network status indicator 106 Network...

Страница 174: ...50 proportional band description 88 guidelines for setting 90 setting a value 113 settings for various temperature ranges 90 settings from other controllers 91 PV Retransmit menu 126 PV Retransmit Obj...

Страница 175: ...44 specifications 153 controller inputs 157 controller outputs 159 TB50 156 system alarms behavior of 138 messages 65 troubleshooting 140 T TB18 alarm outputs 37 connections 39 CPU watchdog timer outp...

Страница 176: ...grounding problems 143 H W error Ambient alarm 141 H W error Gain alarm 141 H W error Offset alarm 141 keypad 132 139 142 low power alarm 140 process variable incorrect on display 138 142 RTDs 143 se...

Страница 177: ...al Ratio master loop Bus off count Cl SDAC hi signal Ratio low SP WATLOW D8x Vx xx cs xxxx Cool action Ratio high SP Cool power limit Control ratio INPUT ClPwr limit time Ratio SP diff Input type Sens...

Страница 178: ...D8 Series User s Guide 178 Declaration of Conformity...

Страница 179: ...atlow co uk Website www watlow com From outside The United Kingdom Tel 44 0 115 964 0777 Fax 44 0 115 964 0071 Asia and Pacific Watlow Singapore Pte Ltd 20 Kian Teck Lane 4th Floor Singapore 627854 Te...

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