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The following table lists the data entry and information fields on the screen and a description of their purposes.
PARAMETER DEFINITION RANGE
NORMAL Adjusts the sensitivity of the time proportional control routine. 0 - 20 PSID
BANDWIDTH
CONTROL The capacity will not be adjusted if the suction pressure is within
DEADBAND the control deadband. 0- 20 PSID
NORMAL The Normal Stage Delay Timer starts when the Suction Pressure
STAGE DELAY exceeds the Control Deadband. When it expires, a stage will be added
or removed as appropriate 1 - 999 SEC
FAST STAGE The Fast Stage Delay Timer starts when the Suction Pressure exceeds
DELAY the Normal Bandwidth. 1 - 999 SEC
SETPOINT The current control setpoint group and value (reference). N/A
SUCTION The current suction pressure (reference). N/A
PRESSURE The current capacity (reference) N/A
CAPACITY
RECIP MODE The current compressor mode (reference). N/A
RECIP STATE The current compressor state (reference). N/A
Process Temperature Control Setpoints
The PROCESS TEMPERATURE CONTROL SETPOINTS screen allows the user to setup the Load and Unload
Controls for Automatic capacity control. The Normal Stage delay and Fast Stage Delay fields are also used for
Capacity changes in the Sequenced mode. Included on this screen is additional reference data to assist the
operator when setting-up the compressor. An example of the screen is shown below.
PROCESS TEMP CONTROL SETPTS hh:mm:ss
LOAD UNLOAD
NORMAL BANDWIDTH XX.X XX.X DEG
CONTROL DEADBAND XX.X XX.X DEG
NORMAL STAGE DELAY XX.X XX.X SEC
FAST STAGE DELAY XX.X XX.X SEC
SETPOINT S1 X.X PSIG PT XX.X DEGF
MODE AUTO CP XX.X PCT
STATE FAILED
Suction Pressure Control Setpoints Definitions
Process Temperature Setpoints Screen
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