Emerson VSG & VSSG Specifications Page 37
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- TROUBLESHOOTING
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Section 2 • Operational Descriptions
Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM
Figure 2-10. Operational Diagram - Air Cooled Condenser (VFD Type)
PT
CONDENSER
TARGET
OUTPUT
PRESSURE
START
PRESSURE
MINIMUM FAN
SPEED
CONDENSING PRESSURE
FAN SPEED
AIR COOLED CONDENSER (VFD TYPE)
Reference Figure 2-10
If installed, the VFD type air cooled condenser is a heat
exchanger that uses one or more fans running on a VFD
to condense refrigerant vapor into a liquid. The VFD
speeds up or slows down the fan motor to control the
amount of cooling done by the condenser.
A PID controller adjusts the speed of the fan(s) to control
condensing pressure. When the condensing pressure
exceeds the desired pressure plus a deadband, the fan(s)
will increase speed to add more cooling. When condens-
ing pressure drops below the desired temperature mi-
nus a deadband, the fan(s) will decrease speed.
• When the compressor is stopped, the condenser
fan(s) will stop.
• When the compressor is running and the oil cooler
outlet temperature rises above the “Condenser Start
Pressure” set in the “VFD Type Condenser Setpoints”
screen, the fan(s) will start at a settable minimum
speed.
• When the compressor is running and the condensing
pressure is above the deadband, the PID controller
will increase fan speed.
• When the compressor is running and the condensing
pressure is below the deadband, the PID controller
will decrease fan speed.
EVAPORATIVE CONDENSER
If installed, an evaporative condenser incorporates a wa-
ter circulating pump that mists water over the condens-
er to provide additional cooling.
• When using with step-type condensers, the pump
can be added or removed from the step sequence as
if it were another fan. The pump will start when the
steps that it is enabled are active.
• When using with VFD-type condensers, the pump
can be enabled or disabled by a selection on the con-
denser control setpoints screen. When enabled, the
pump starts at the same time as the fan.
- 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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