Emerson VSG & VSSG Specifications Page 160
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- TROUBLESHOOTING
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Section 12 • Communications with a Central Controller/DCS
Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM
Compressor Commands: “REAL_IN” (Data Type = REAL)
Interface Tag Description Units
REAL_IN[0]
Remote Discharge Pressure Setpoint PSIA
REAL_IN[1]
Remote Process Temp Setpoint PSIA
REAL_IN[2]
Remote Suction Pressure Setpoint PSIA
REAL_IN[3]
Common Discharge Header Pressure From DCS PSIA
REAL_IN[4]
Common Suction Header Pressure From DCS PSIA
REAL_IN[5]
Capacity Slide Position Command From DCS % Position
Table 12-10. Compressor Command (Real)
DISCRETE COMPRESSOR COMMANDS
Discrete Compressor commands are presented in
Double Integer Format. To send discrete commands,
it is necessary to address the specifi c bits of the Double
Integer.
Write Data: “BOOL_IN” (Data Type = DINT)
Interface Tag Description
BOOL_IN[1].0
Soft Capacity Decrease Command from DCS
BOOL_IN[1].1
Soft Capacity increase Command from DCS
BOOL_IN[1].2
Local Mode Command from DCS
BOOL_IN[1].3
Remote Mode Command from DCS
BOOL_IN[1].4
Reset Alarms from DCS
BOOL_IN[1].5
Soft Run Command from DCS
BOOL_IN[1].6
Command to Switch to Setpoint 1
BOOL_IN[1].7
Command to Switch to Setpoint 2
BOOL_IN[1].8
BOOL_IN[1].9
BOOL_IN[1].10
BOOL_IN[1].11
BOOL_IN[1].12
BOOL_IN[1].13
BOOL_IN[1].14
BOOL_IN[1].15
Table 12-11. Compressor Command (Double Integer)
If Control by communications is enabled from the
Confi guration Screen, the soft run command (BOOL_
IN[1].5) must be held HIGH in addition to the remote
permissive physical input.
- Single Screw Compressor PLC 1
- Important Message 4
- Table of Contents 5
- List of Tables and Figures 10
- HOW TO USE THIS MANUAL 13
- ADDITIONAL IMPORTANT NOTES 13
- Glossary of Terms 14
- 23 678 5 19
- Wiring Requirements 21
- Overview 23
- Operational Descriptions and 24
- Diagrams 24
- COMPRESSOR STARTUP SEQUENCE 25
- AUTO START-STOP 26
- ANTI-RECYCLE 26
- CAPACITY SLIDE CONTROL 26
- OPERATING MODES 30
- DISCHARGE 31
- PRESSURE 31
- SUCTION 31
- VFD CAPCITY CONTROL 32
- VOLUME SLIDE CONTROL 32
- SAFETIES 32
- EMERGENCY STOP 32
- OIL HEATERS 33
- OIL DRAIN SOLENOID 33
- 2-WAY OIL MIXING VALVE 34
- OIL INJECTION VALVE 34
- OIL COOLER TEMPERATURES 35
- OIL COOLER STANDBY HEATER 35
- EVAPORATIVE CONDENSER 37
- OIL COOLER 38
- CONDENSER 39
- WATER COOLED GAS AFTERCOOLER 40
- WATER COOLED CONDENSER 41
- LIQUID INJECTION VALVE 42
- VPLUS LIQUID INJECTION PUMP 43
- DISCHARGE RECYCLE VALVE 44
- ECONOMIZER SOLENOID(S) 45
- HOTGAS BYPASS SOLENOID 45
- VENTURI OIL RECOVERY 45
- GAS SCRUBBERS 45
- BUILDING ENCLOSURE DEVICES 46
- PERIODIC SLIDE VALVE EXERCISE 46
- Section 3 • Overview Screens 47
- 3 – 8 / Blank 54
- Section 4 • HMI Navigation 55
- 4 – 10 / Blank 64
- DATE AND TIME 66
- REMOTE OPERATION 66
- PANELVIEW CONFIGURATION 68
- INITIAL RUNNING DATA 68
- DEVICE NAMES 68
- BACK TO MENU 68
- Editing Device Names 69
- INSTRUMENTATION 70
- ALARM AND TRIP 71
- Calibration Main Screen 73
- Pressure Calibration Screen 74
- CALIBRATE PRESSURE INSTRUMENT 75
- OPTION 1 75
- OPTION 2 75
- Slide Calibration Screen 78
- Figure 6-8. Actuator Assembly 80
- Figure 6-9. Photo-chopper 81
- 6 – 10 / Blank 82
- Setpoints and Control Screens 83
- Compressor Control Setpoints 84
- MAIN MOTOR VFD 86
- DISCHARGE PRESSURE CONTROL 87
- CAPACITY SLIDE VALVE 87
- AUTO START/STOP 88
- ANTI-RECYCLE 89
- START UP 89
- SHUT DOWN 89
- PART TIME OIL PUMP 90
- LOAD LIMITS 90
- VOLUME SLIDE ADJUSTMENT 90
- MAIN MOTOR FLA 90
- OIL SEPARATOR HEATERS 90
- 7 – 10 / Blank 92
- Alarm and Trip Setpoints 93
- Oil Mixing Valve Screen 95
- Aftercooler Screens 98
- Condenser Screens 101
- Volume Slide Details Screen 107
- Start Menu Popup Screen 108
- IO/Comms Diagnostics Screen 109
- Event List Screen 110
- 10 – 6 / Blank 114
- Alarm Listing 115
- Alarm Message Cause(s) Notes 117
- Trip Listing 123
- Trip Message Cause(s) Notes 124
- Status Message Notes 130
- Troubleshooting 134
- Communication with a Central 135
- Controller/DCS 135
- Compressor PLC 135
- Pressure Units 136
- Temperature Units 136
- Alarm and Trip Data 142
- Interface Tag Description 143
- Status Data 150
- States of Discrete I/O 154
- Table 12-8. State Indicator 159
- Table 12-9. Mode Indicator 159
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