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Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 10 • Compressor Sequencing
Overview
Compressor sequencing screen is where more than one
Vission 20/20 panels can be sequenced in network using
Modbus TCP. These settings defi ne how the master com-
pressor should control sequenced Vission 20/20 panels.
This feature is enabled from the Confi guration Screen,
see Figure 10-1. Compressor Sequencing Screen.
Compressor Sequencing:
• Enables Compressor Sequencing. Uncheck the box to
disable compressor sequencing.
Master:
• Enables Compressor Sequencing in Master Mode.
Slave:
• Enables Compressor Sequencing in Slave Mode.
Compressor Name:
• Defi nes Unique name of a Compressor / Vission
20/20 Panel on sequenced network.
Pressure Control Setpoints
Compressor Sequencing screen defi nes settings those
are used by master compressor for sequencing.
Load Rate 2 offset (outer):
• Defi nes the outer pressure/temp setpoint offset to
monitor compressor load. If Suction pressure / pro-
cess temperature surpasses Load Rate 1 offset and
goes beyond Load Rate 2 setpoint offset then se-
quencing decisions are made according to Load Rate
2 timer.
Load Rate 1 offset (inner):
• Defi nes the inner pressure/temp setpoint offset to
Figure 10-1. Compressor Sequencing Screen