Emerson VSG & VSSG Specifications Page 15
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- TROUBLESHOOTING
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Single Screw Compressor PLC Operation Manual •Vilter/Emerson • 35391CM
Section 1 • General Information
Hotgas Bypass
Self-regulated valve which provides a “false load” by
recycling discharge gas to suction in refrigeration ap-
plications. Used to prevent the compressor from shut-
ting down during low load conditions. A solenoid valve
controlled by the compressor PLC enables the Hotgas
Bypass valve to function.
Inlet Scrubber
Vessel located on the inlet side of gas compressor or gas
chiller to remove moisture and contaminants.
Inlet Scrubber Inlet Pressure
Pressure of gas measured at the inlet of the inlet
scrubber.
Inlet Scrubber Outlet Pressure
Pressure of gas measured at the outlet of the inlet
scrubber.
Inlet Scrubber Pressure Drop
Pressure differential between inlet and outlet of the in-
let scrubber. Calculated: Scrubber Inlet Pressure minus
Scrubber Outlet Pressure.
Liquid Injection
Method of oil cooling where liquid refrigerant is metered
into the compressor by a motorized or air actuated valve.
Liquid Refrigerant Temperature
Temperature of the liquid refrigerant measured in the
chiller, also known as the evaporation temperature.
Main Motor
AC induction motor that is coupled to and drives the
compressor.
Net Oil Pressure
Calculated: Oil Filter Outlet (Manifold) Pressure minus
Suction Pressure. Monitored while compressor is run-
ning to ensure adequate lubrication.
Oil Circuit Pressure Drop
Calculated: Discharge Pressure minus Oil Filter Outlet
(Manifold) Pressure.
Oil Cooler
Heat Exchanger where hot oil from the compressor is
cooled.
Oil Cooler Inlet Temperature
Temperature of compressor oil measured at the inlet of
the oil cooler.
Oil Cooler Outlet Temperature
Temperature of compressor oil measured at the outlet
of the oil cooler.
Oil Filter Differential Calculated
Oil Filter Outlet (Manifold) Pressure minus Oil Filter Inlet
Pressure. Monitored while compressor is running to de-
termine condition of oil fi lter(s).
Oil Filter Inlet Pressure
Pressure of the compressor oil measured at the inlet of
the oil fi lter(s).
Oil Filter Outlet (Manifold) Pressure
Pressure of the compressor oil measured between the
oil fi lter(s) and the compressor.
Oil Injection Temperature
Temperature of the compressor oil going into the
compressor.
Oil Separator
Vessel the compressor discharges into that separates oil
from gas or refrigerant.
Oil Separator Gas Outlet Temperature
Temperature of the gas or refrigerant measured at the
outlet of the oil separator vessel.
Oil Separator Outlet Pressure
Pressure of discharge gas or refrigerant measured at the
outlet of the oil separator.
Oil Separator Pressure Drop Calculated
Discharge Pressure minus Oil Separator Outlet Pressure.
Monitored to determine condition of coalescing ele-
ments inside the oil separator vessel.
Outlet Scrubber
Vessel located on the outlet side of gas compressor or
gas chiller to remove moisture, oil, and/or contaminants.
Outlet Scrubber Inlet Pressure
Pressure of gas measured at the inlet of the outlet
scrubber.
- 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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