Emerson VSG & VSSG Specifications Page 85
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Section 7 • Compressor Control Setpoints
Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM
CAPACITY SLIDE VALVE
• Load/Unload Interval time: This is the cycle time be-
tween making capacity slide position adjustments.
• Max Load/Unload Adjustment per interval: This is the
maximum amount the capacity position command
may be adjusted by every time through the Load/
Unload Cycle timer.
AUTO START/STOP
• Auto Start Pressure: When suction pressure is above
this setpoint for the Auto Start Delay Time, the com-
pressor will be commanded to start.
• Auto Stop Pressure: When suction pressure is below
this setpoint and capacity slide position is below
Minimum Slide Position for the Auto Stop Delay time,
the compressor will be commanded to stop.
• Auto Start Delay: Amount of time Auto Start pres-
sure must be met before the compressor will be com-
manded to start.
• Auto Stop Delay: Amount of time Auto Stop pressure
must be met before the compressor will be com-
manded to stop.
• Minimum Slide Position: Slide position must be be-
low this setpoint (indicating the compressor is fully
unloaded) before the compressor will be command-
ed to stop.
MAIN MOTOR VFD
• Max Speed Increase/Decrease per interval: This is the
maximum amount the main motor speed command
may be adjusted by every time through the Load/
Unload Cycle timer.
• Forced Unload Rate: If a forced unload condition ex-
ists and the main motor is running above 50% speed,
this is the rate it will decelerate until it reaches 50%
speed and the capacity slide begins unloading.
Compressor Control Setpoints Screen 1 - Process Temperature
The Compressor Control Setpoints page 1 (Process
Temperature) screen appears when navigating to
“Compressor Control Setpoints” from the menu
screen when Process Temperature control is selected.
Setpoints for desired process temperature, capacity
slide valve control, auto start-stop, and main motor VFD
are settable within this screen. For more information
and operational descriptions, see section 2 “Operational
Descriptions.”
The following groups of setpoints are settable. If mul-
tiple groups of setpoints are being used, the active
group of setpoints is designated by the “Setpoint 1” or
“Setpoint 2” text being shown in green. Auto Start/Stop
and Main Motor VFD Setpoints will appear if selected.
PROCESS TEMPERATURE CONTROL
• Target Process Temperature: This is the desired pro-
cess temperature the compressor will try to maintain.
• Upper and Lower Deadband: This is a range of tem-
peratures above and below the Target Process
Temperature. Within this range, no capacity slide
position adjustments will be made.
• Upper and Lower Proportional Band: This is a range
of temperatures above and below the Target Process
Temperature. Within this range, the controller will
make proportionally smaller adjustments to capacity
slide position.
CAPACITY SLIDE VALVE
• Load/Unload Interval time: This is the cycle time be-
tween making capacity slide position adjustments.
• Max Load/Unload Adjustment per interval: This is the
maximum amount the capacity position command
may be adjusted by every time through the Load/
Unload Cycle timer.
AUTO START/STOP
• Auto Start Temperature: When process temperature
is above this setpoint for the Auto Start Delay Time,
the compressor will be commanded to start.
• Auto Stop Temperature: When process temperature
is below this setpoint and capacity slide position
is below Minimum Slide Position for the Auto Stop
Delay time, the compressor will be commanded to
stop.
• Auto Start Delay: Amount of time Auto Start tem-
perature must be met before the compressor will be
commanded to start.
• Auto Stop Delay: Amount of time Auto Stop tempera-
ture must be met before the compressor will be com-
manded to stop.
• Minimum Slide Position: Slide position must be be-
low this setpoint (indicating the compressor is fully
unloaded) before the compressor will be command-
ed to stop.
- 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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