Standard Screw Compressor - RWB Series
iv
M&M
R
EFRIGERATION
I
NC
.
Oil Pressure Calculations ......................................................... 3-3
Oil Level Indication.................................................................. 3-3
Starting the Screw Compressor..................................................... 3-3
Manual Mode............................................................................ 3-4
Automatic Mode....................................................................... 3-5
Remote/Auto Remote Mode..................................................... 3-5
I/O Control ........................................................................... 3-5
Network Control................................................................... 3-5
Sequenced Mode ...................................................................... 3-5
Stopping the Screw Compressor................................................... 3-6
Manual Mode............................................................................ 3-6
Automatic Mode....................................................................... 3-6
Remote Mode ........................................................................... 3-6
I/O Control ........................................................................... 3-6
Network Control................................................................... 3-6
Sequenced Mode ...................................................................... 3-7
Capacity Control ........................................................................... 3-7
Computed Slide Valve Position ................................................ 3-7
Manual Capacity Control ......................................................... 3-7
Automatic Capacity Control..................................................... 3-7
Control Groups..................................................................... 3-8
Time Proportional Control Strategy..................................... 3-8
Remote Capacity Control ......................................................... 3-11
I/O Control ........................................................................... 3-11
Network Control................................................................... 3-11
Auto-Remote Capacity Control................................................ 3-11
I/O Control ........................................................................... 3-11
Network Control................................................................... 3-12
Sequenced Capacity Control .................................................... 3-12
Low Alarm and Failure Setpoints ........................................ 3-12
Running in Trim Mode......................................................... 3-12
Running in Full Load Mode................................................. 3-13
Anti-Cycle in Sequenced Mode ........................................... 3-13
Forced Unloading & Limiting .................................................. 3-13
Ramp Start ................................................................................ 3-13
Slide Valve Position Ramp Start Limiting................................ 3-14
Unload Solenoid Configuration ........................................... 3-15
Setpoint Scheduling ...................................................................... 3-15
Daily Schedules ........................................................................ 3-15
Weekly Schedule ...................................................................... 3-15
Variable Vi Slide Stop Control...................................................... 3-16
Vi Adjustments..................................................................... 3-16
Manual Vi Adjustment ......................................................... 3-16
Vi Slide Stop and Capacity Slide Valve Interference ............... 3-16
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