Emerson VILTER MicroVission Operation And Service Manual page 243

Appendix D • Compressor Sequencing Setup
Stop Timer
• Provides delay to stop the next compressor in se-
quencing. In unload/stop sequence when Suction
Pressure/ process temperature goes below stop off-
set then it will be monitored for stop Time period.
Compressor Sequencing Control Mode
• Defines the control mode for compressor sequencing.
Load / Unload offset setpoint and Load / Unload
Interval settings refer from Compressor Control
Menu (see Figure D-3).
Users below security level 2 (Supervisor) are not allowed
to edit the sequencing settings.
Example:
Compressor Sequencing Setpoints:
Pressure control setpoints for setpoint 22 psig,
Figure D-3. Compressor Control Menu Setup (Load & Unload Setpoints)
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
NOTE
Suction Pressure setpoint = 22 psig
Start Offset = 6 psig
Start Timer = 10 sec
Stop Offset = 6 psig
Stop Timer = 10 sec
Compressor Control Setpoints:
Load Offset = 2 psig
Load Interval = 20 sec
Unload Offset = 2 psig
Unload Interval = 20 sec
Assumptions:
• Compressor Sequencing Table on page 1 has below
settings.
Equipment IP Address
Comp1 192.168.1.95
Comp2 192.168.1.96
Priority Status
1
2
D − 3