Emerson Vilter MicroVission, Operation And Service Manual

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5 – 3
Section 5 • Compressor Control
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.0
Process Temperature Control
When the Active Control Mode is set to “Process
Temperature SP1” or “Process Temperature SP2”’, the
control setpoint is Process Temperature Control.
Temp Control Setpoint
The process temperature of the compressor to operate
when the compressor is running in Auto, Remote Auto,
or Direct I/O Auto run mode.
Load Offset
The offset value when added to the “Temp Control” set-
point, determines the process temperature for loading
the compressor.
Load Interval
The time interval for which control algorithm will wait
between the steps while loading the compressor.
When the process temperature of the compressor is
equal to or greater than the “Temp Control” setpoint
plus the “Load Offset” value, the control algorithm loads
one step and then waits for the load interval time. Once
the load interval time is lapsed, the control algorithm
will again check if the process temperature is equal to or
greater than the “Temp Control” setpoint plus the “Load
Offset” value. If yes, MicroVission loads the next step.
Unload Offset
The offset value when removed from the “Temp Control”
setpoint, determines the process temperature for un-
loading the compressor.
Unload Interval
The time interval for which control algorithm will wait
between the steps while unloading the compressor.
When the process temperature of the compressor is less
than or equal to the “Temp Control” setpoint minus the
“Unload Offset” value, the control algorithm unloads
one step and then waits for the unload interval time.
Once the unload interval time is lapsed, the control al-
gorithm will again check if the process temperature is
less than or equal to the “Temp Control” setpoint minus
the “Unload Offset” value. If yes, MicroVission unloads
the next step.
Figure 5-2. Compressor Control Screen - Process Temperature Control