Section 10 • Compressor Sequencing

monitor compressor load. If Suction pressure / pro- cess temperature goes beyond Load Rate 1 setpoint offset then sequencing decisions are made according to Load Rate 1 timer.

Suction Pressure/Process Temperature Control Setpoint:

•The target setpoints are read only values here. These setpoints can be changed by logging on to “Compressor Control” Screen.

Unload Rate 1 Offset (inner):

•Defines the inner pressure/temp setpoint to moni- tor compressor load. If Suction Pressure/Process Temperature Control drops below Unload Rate 1 set- point offset then sequencing decisions are made ac- cording to Unload Rate 1 timer.

Unload Rate 2 Offset (outer):

•Defines the outer Pressure/Temp setpoint offset to monitor compressor load. If Suction Pressure/ Process Temperature drops below Unload Rate 1 offset and goes below Unload Rate 2 setpoint offset, then sequencing decisions are made according to Unload Rate 2 timer.

Capacity Load/Unload Timers:

•One of the following Capacity Load/Unload rate timers are used to make sequencing decisions peri- odically. Suction Pressure/Process Temperature set- points are monitored to identify which one of the fol- lowing timers to be used.

Load Rate 1 (Inner):

•If Suction Pressure/Process Temperature goes be- yond Load Rate 1 setpoint offset then Load Rate 1 timer is used to make periodic sequencing decisions.

Load Rate 2 (Outer):

•If Suction Pressure/Process Temperature surpasses Load Rate 1 offset and goes beyond Load Rate 2 set- point offset then Load Rate 2 timer is used to make periodic sequencing decisions.

Unload Rate 1 (Inner):

•If Suction Pressure/Process Temperature goes below Unload Rate 1 setpoint offset then Unload Rate 1 timer is used to make periodic sequencing decisions.

Unload Rate 2 (Outer):

•If Suction Pressure/Process Temperature surpasses Unload Rate 1 offset and goes below Unload Rate 2 setpoint offset then Unload Rate 2 timer is used to make periodic sequencing decisions.

Compressor Sequencing Table:

•Compressor sequencing table menu allows operator to view and adjust settings those are used for com- pressor sequencing.

Equipment:

•Options of this combo box are updated automatical- ly. This contains names of all the compressors in the network communicating with Master compressor. Equipment name can be selected from drop-down list. Same Equipment name should not be configured more than once in Sequencing table.

Control:

•Inclusion/exclusion of compressor partaking in the sequencing can be decided on basis of this toggle button. Compressors can be included/excluded by toggling ON/OFF.

NOTE

Switching a compressor control to OFF when running in auto seq mode puts respective slave compressor into local auto mode. This feature is used to add or remove slave compressors to sequence table when running in auto sequence mode.

CFM:

•CFM column is read only. These values are updat- ed automatically when Equipment combo box is changed. This indicates Slave compressor capacity in CFM.

Priority:

•This defines priorities of compressors on the network. This priority will decide the sequence in which com- pressors will be turned on and off during sequence cycle. Lower the priority number greater the priority of the compressor.

Step:

•This parameter would decide stepwise increment or decrement value in percentage of the compressor capacity. In the case when last step makes total ca- pacity greater than maximum capacity, total capac- ity will get reduced to maximum capacity. Same is applicable when last step makes total capacity lower than minimum capacity takes priority.

Min Cap:

•Defines the lowest capacity in percentage with which a compressor is allowed to run. Minimum capacity value takes preference on first step value.

Max Cap:

•Defines the highest capacity in percentage with which a compressor is allowed to run. Maximum ca- pacity value takes preference over last step value.

Machine Start Time:

•Machine start timer shows the time in seconds that the Master Compressor will hold before starting slave compressor once (Start) decision is taken.

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20/20 specifications

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