Emerson VSG & VSSG Specifications Page 39
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Section 2 • Operational Descriptions
Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM
outlet temperature rises above the “Oil Cooler Start”
temperature set in the “Step Type Oil Cooler
Setpoints” screen, the fi rst fan (or group of fans) will
start.
• When the compressor is running and the oil cooler
outlet temperature is above the deadband, a fan (or
group of fans) will start each time through the “Step
Dwell Time.”
• When the compressor is running and the oil cooler
outlet temperature is below the deadband, a fan (or
group of fans) will stop each time through the “Step
Dwell Time.”
• Once started, the fi rst fan or group of fans will remain
running until the compressor stops.
AIR COOLED AFTERCOOLER (STEP TYPE)
Reference Figure 2-11
If installed, the step type air cooled aftercooler is a heat
exchanger that uses multiple fans to remove heat from
the gas discharged from the compressor. The number
of fans that run is determined by the gas temperature at
the outlet of the aftercooler.
The controller starts and stops fans in a sequence to con-
trol the gas temperature at the outlet of the aftercool-
er. When the aftercooler outlet temperature exceeds
the desired temperature plus a deadband, fans will be
turned on after a time delay to add more cooling. When
aftercooler outlet temperature drops below the desired
temperature minus a deadband, fans will be turned off
after a time delay.
• When the compressor is stopped, all aftercooler fans
are turned off.
• When the compressor is running and the aftercooler
outlet temperature rises above the “Start Aftercooler
At” temperature set in the “Step Type Aftercooler
Setpoints” screen, the fi rst fan (or group of fans) will
start.
• When the compressor is running and the aftercooler
outlet temperature is above the deadband, a fan (or
PT
CONDENSER
group of fans) will start each time through the “Step
Dwell Time.”
• When the compressor is running and the aftercooler
outlet temperature is below the deadband, a fan (or
group of fans) will stop each time through the “Step
Dwell Time.”
• Once started, the fi rst fan or group of fans will remain
running until the compressor stops.
AIR COOLED CONDENSER (STEP TYPE)
Reference Figure 2-12 and 2-11 for curves
If installed, the step type air cooled condenser is a heat
exchanger that uses multiple fans to condense refriger-
ant vapor to a liquid. The number of fans that run is de-
termined by the refrigerant pressure at the condenser.
The controller starts and stops fans in a sequence to
control the condensing pressure. When the condensing
pressure exceeds the desired pressure plus a deadband,
fans will be turned on after a time delay to add more
cooling. When condensing pressure drops below the
desired pressure minus a deadband, fans will be turned
off after a time delay.
• When the compressor is stopped, all condenser fans
are turned off.
• When the compressor is running and the oil cooler
outlet temperature rises above the “Condenser Start”
pressure set in the “Step Type Condenser Setpoints”
screen, the fi rst fan (or group of fans) will start.
• When the compressor is running and the condens-
ing pressure is above the deadband, a fan (or group
of fans) will start each time through the “Step Dwell
Time.”
• When the compressor is running and the condens-
ing pressure is below the deadband, a fan (or group
of fans) will stop each time through the “Step Dwell
Time.”
• Once started, the fi rst fan or group of fans will remain
running until the compressor stops.
Figure 2-12. Operational Diagram - Air Cooled Condenser
- 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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