Watlow 8LS Controller Manuel d'utilisateur Page 120
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112 8LS User’s Guide
Appendix B: 8LS-CP
Probe Burn Off
Carbon Probe Burn Off Requirements:
1. To burn off carbon, excess fresh air is supplied to the end of the
probe.
2. The excess fresh air burning off the carbon will cause the temperature
of the probe to increase. The temperature must be monitored from the
probe internal T/C, so that the maximum temperature of the probe is
not exceeded.
3. The excess fresh air flow requirement is 1 to 2 SCFH.
4. The frequency and length of the burn off may be controlled from a
timer or from a contact.
5. The frequency is normally measured in hours and the amount of time
for the burn off is in minutes.
6. The CP controller PID output must be maintained, so that there is no
change of the enriching gas, due to the misreading of the CP probe
during burn-off.
7. The level of the PID control signal must be maintained following the
burn off cycle to allow the probe to recover before automatic control
is restored.
8. The method of burn-off is determined by the type of furnace.
Burn off Procedures
Continuous Furnace
(In time mode)
Batch Furnace
(in input mode)
Recommended air flow
2 SCFH 1 SCFH
Purge period
5 minutes set by operator Time set by operator
Burn off cycle
3 hours set by operator Cycles with open door
Method of operation
1. Hold enrichment gas at current
level during purge cycle.
2. Monitor carbon probe tempera-
ture with the built in T/C.
1. Disable enrichment gas
during cycle.
2. Monitor carbon probe tem-
perature with the built in T/C.
Set the SP for maximum probe temperature of either 1900 or 2100
º
F. The carbon burn off
cycle will stop if temperature exceeds the limit. The burn off will continue when tempera-
ture goes below the limit.
- User’s Guide 1
- Warranty 2
- Contents 3
- Using the 8LS 37 4
- Setup 45 4
- Tuning and Control 75 5
- Troubleshooting 85 6
- Appendix A: Ramp Soak 89 6
- Appendix B: 8LS-CP 105 7
- Appendix C: 8LS Cascade 121 7
- Glossary 123 7
- System Diagram 10
- 4 8LS User’s Guide 12
- Overview 12
- Introduction 13
- Installation 17
- Read This Before Installation 18
- Mounting The 8LS 19
- 12 8LS User’s Guide 20
- External Wiring 21
- General Wiring Requirements 21
- Cable Recommendations 23
- Noise Suppression 24
- 130 VAC ratin 25
- RTB Connections 27
- Analog Inputs 28
- Common Mode Voltage 28
- Normal Mode Voltage 28
- Grounding 28
- Input Scaling 29
- Resistor Installation 30
- Voltage Inputs 31
- Milliamp Inputs 31
- Thermocouple Inputs 31
- RTD Inputs 32
- Pulse Input 33
- Carbon Probe Input 33
- Control Outputs 35
- Pid Control Relay Outputs 36
- Primary Analog Outputs 37
- CPU Dip Switch 39
- RS-232 Connections 41
- RS-485 Description 42
- RS-485 Connections 43
- Using the 8LS 45
- Ramp/Soak 47
- Man/Auto 47
- Displays 48
- Single Loop Display 49
- Scanning Display 49
- Alarm Display 49
- SP ? 25 51
- 6 = AUTO 51
- SET? TUNE 51
- 6 SET MAN 52
- How to enter the Setup menus? 53
- How to edit a menu? 53
- (T/C & RTDs) 54
- 1 1 1 1 1 1 1 1 54
- GLOBALS? 55
- Save as Job 56
- Restore a Job 56
- Set Alarm Delay 56
- Set R/S Time Base 57
- Lock Panel 57
- Power Up Output Status 57
- CONTRLLR 58
- ADDR? 1 58
- COMM ERR 58
- CHK? BCC 58
- Communication Baud Rate 59
- Communication Protocol 59
- AC Line Frequency 59
- EPROM Version 60
- 1 SETUP 61
- INPUT? 61
- 1 INPUT 62
- TYPE? J 62
- 1 INPUT 63
- SMPLT? 1 63
- 1 INPUT 63
- UNIT = F 63
- Linear Scaling Menus 64
- High PV Display 64
- High RDG Display 64
- Low PV Display 64
- 1 LO RDG 65
- 1 OFFSET 66
- 1 SETUP 67
- CONTROL ? 67
- Heat/Cool PB 68
- Heat/Cool TI 68
- Heat/Cool TD 68
- Heat/Cool Output Filter 68
- 1 CONTROL 69
- SPR? 10 69
- OUTPUTS? 70
- 1 OUTPUTS 71
- CT ? 10 71
- ACT ?REV 72
- LIM ? 100 72
- LTM ? C 73
- NLO ?OFF 73
- 1 HT OUT? 74
- TERM BLK 74
- Setup Alarms 75
- Alarm Types 76
- Global Alarms 76
- Process Alarms 76
- High Process Alarm Setpoint 77
- High Process Alarm Status 77
- Deviation Band Alarm 78
- Deviation Band Alarm Status 78
- Low Process Alarm Setpoint 79
- Low Process Alarm Status 79
- Alarm Deadband 80
- Alarm Delay 80
- INS = 1 1 1 1 81
- TEST OUT 82
- NR = 1 82
- DIG OUT 82
- NR01? OFF 82
- Tuning and Control 83
- Control Modes 84
- Digital Output Control Forms 86
- Time Proportioning (TP) 86
- Output Digital Filter 87
- Reverse and Direct Action 87
- Integral Term (TI) Settings 89
- Derivative Term (TD) Settings 89
- Proportional Band Only (P) 90
- PI with Derivative (PID) 90
- 8LS User’s Guide 83 91
- 84 8LS User’s Guide 92
- Troubleshooting 93
- Computer Supervised Systems 94
- Communications Problems 95
- Serial Interface 95
- 88 8LS User’s Guide 96
- Appendix A: Ramp Soak 97
- Configuring Ramp/Soak 98
- Setting the R/S Time Base 99
- Editing R/S Parameters 99
- Choosing a Profile to Edit 99
- R/S PRO 100
- COPY? H 100
- A OUTTOL 100
- T? 1:00 100
- Editing the Ready Setpoint 101
- Editing a Segment 102
- Setting Segment Time 102
- A SEG 01 103
- SP? OFF 103
- EVENTS? 103
- Editing Event Outputs 104
- Changing Event States 104
- Editing Segment Triggers 104
- 1234 56 78 105
- Setting Segment Tolerance 106
- Ending a Profile 106
- Repeating a Profile 106
- 1 SELECT 107
- PROF? 0 107
- 1A00/20S 108
- SET? RUN 108
- 3 73 F 109
- 73 S 0 109
- Bar graph display 110
- Ramp/Soak Key Displays 110
- How long has the profile run? 110
- CYC 1/1 111
- SET?HOLD 111
- RESET? A 112
- Appendix B: 8LS-CP 113
- System Configuration 114
- Specifications 116
- CP Control 117
- Applications 118
- Carbon Probe 119
- Probe Burn Off 120
- Burn Off Function 121
- 1 INPUTS 122
- TYPE? K 122
- 2 INPUTS 122
- TYPE? CP 122
- CO+CO2% and % of Hydrogen 123
- Engineering Units 123
- 2 OFFSET 124
- ? 0 ºF 124
- 2 CP 124
- BURNOFF? 124
- Burn Off Time Interval 125
- Burn Off start Input 125
- Burn Off Time Period 126
- 2CP GAS 127
- OUTPN? 0 127
- 2 HIT %CP 127
- . 25 M 0 127
- 120 8LS User’s Guide 128
- Appendix C: 8LS Cascade 129
- Choosing the Primary Loop 130
- Glossary 131
- 132 8LS User’s Guide 140
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