Emerson VSG & VSSG Specifications Page 27
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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
• Unload Interval Time – Cycle time for calculating ca-
pacity slide position adjustment when the controller
is calling for the machine to decrease capacity slide
position. Where the Load Interval Time is T2, the
control will make an adjustment calculation every T2
seconds.
• Max Load Adjustment per Interval – Maximum posi-
tion adjustment that can be made when the control
is calling for the machine to increase capacity slide
position. Where the Maximum Load Adjustment is
A1, the capacity slide position will increase by A1%
every cycle of the Load Interval Timer when outside
the bandwidth range. When inside the bandwidth
range, the capacity slide position adjustment will be
a percentage of A1.
• Max Unload Adjustment per Interval – Maximum po-
sition adjustment that can be made when the control
is calling for the machine to decrease capacity slide
position. Where the Maximum Unload Adjustment
is A2, the capacity slide position will increase by A2%
every cycle of the Unload Interval Timer when out-
side the bandwidth range. When inside the band-
width range, the capacity slide position adjustment
will be a percentage of A2.
When the compressor is stopped, the capacity slide will
return to its minimum position.
SUCTION PRESSURE & PROCESS TEMPERATURE
*EVERY CYCLE OF INTERVAL TEMPERATURE, MAX LOAD
ADJUSTMENT IS MADE (CAP INCREASE)
60 PSIG
*EVERY CYCLE OF INTERVAL TIMER, CAPACITY COMMAND WILL
INCREASE BY CALCULATED AMOUNT, PROPORTIONAL TO ERROR
51 PSIG
*EVERY CYCLE OF INTERVAL TIMER, CAPACITY COMMAND WILL
DECREASE BY CALCULATED AMOUNT, PROPORTIONAL TO ERROR
1 PSID (NO ADJUSTMENT)
49 PSIG
45 PSIG
*EVERY CYCLE OF INTERVAL TIMER, MAX UNLOAD
ADJUSTMENT IS MADE (CAPACITY DECREASE)
DISCHARGE PRESSURE
*EVERY CYCLE, UNLOAD BY MAX UNLOAD ADJUSTMENT
105 PSIG
*EVERY CYCLE OF INTERVAL TIMER, MAKE
PROPORTIONAL ADJUSTMENT (CAPACITY DECREASE)
102 PSIG
*EVERY CYCLE OF INTERVAL TIMER, MAKE
PROPORTIONAL ADJUSTMENT (CAPACITY INCREASE)
2 PSID (NO ADJUSTMENT)
98 PSIG
90 PSIG
*EVERY CYCLE, LOAD BY MAX LOAD ADJUSTMENT
PRESSURE OR TEMPERATUREPRESSURE
UPPER BANDWIDTH
5 PSID
TARGET (100 PSIG)
LOWER BANDWIDTH
10 PSID
TARGET (50 PSIG)
UPPER PROPORTIONAL BAND
(10 PSID)
UPPER PROPORTIONAL DEADBAND
LOWER PROPORTIONAL DEADBAND
LOWER PROPORTIONAL BAND
(5 PSID)
1 PSID (NO ADJUSTMENT)
2 PSID (NO ADJUSTMENT)
UPPER PROPORTIONAL DEADBAND
LOWER PROPORTIONAL DEADBAND
Figure 2-2. Capacity Slide Control Diagram (Example)
- 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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