Glossary Of Terms - Emerson Vilter PLC Operation Manual

Section 1 • General Information

Glossary of Terms

Aftercooler Heat Exchanger
Used to cool discharge gas from the blower package.
Aftercooler Outlet Temperature
Temperature of gas measured at the outlet of the
Aftercooler.
Alarm Warning
Annunciated by the blower PLC that an operational or
process condition is abnormal. When active, alarms will
be displayed but will not shut down the blower package.
Bearing Temperature
Temperature of the bearings of the blower main motor
measured by an RTD.
Blower
Positive displacement rotary compressor intended to
move high volume of gas at relatively low pressure.
Blower Offset Dwell Time
Amount of time between starting individual blowers.
Used in applications where all blowers on a package
starting at the same time would put too great of a bur-
den on the electrical infrastructure.
Blower Package
Arrangement of up to 4 blowers controlled by a com-
mon PLC controller.
Blower-Specifi c Trip
A shutdown condition that applies to a specifi c blower.
Differential Pressure
The difference between two pressures.
Discharge Recycle Control Pressure
Pressure of discharge gas measured at the Discharge
Recycle Valve. Used to control the Discharge Recycle
Valve.
1 – 2
Discharge Recycle Control Pressure
Pressure of discharge gas measured at the Discharge
Recycle Valve. Used to control the Discharge Recycle
Valve.
Discharge Recycle Valve
Motorized or Air Actuated Valve that recycles discharge
gas back to the suction side of the blower package.
Discharge Pressure
Pressure of the refrigerant or gas measured at the outlet
of the blower.
Discharge Temperature
Temperature of the refrigerant or gas measured at the
outlet of the blower.
Ethernet IP
Communication protocol used to communicate to the
blower PLC.
General Trip
Shutdown condition that applies to the entire blower
package. If active, will shut down the entire package.
HMI
HMI stands for "Human-Machine Interface." The blower
HMI is a touchscreen terminal mounted in the door of
the blower control enclosure.
Inlet Scrubber
Vessel located on the inlet side of gas blower or gas chill-
er to remove moisture and/or contaminants.
Inlet Scrubber Inlet Pressure
Pressure of gas measured at the inlet of the inlet
scrubber.
Inlet Scrubber Outlet Pressure
Pressure of gas measured at the outlet of the inlet
scrubber.
Inlet Scrubber Pressure Drop
Pressure differential between inlet and outlet of the in-
let scrubber. Calculated: Scrubber Inlet Pressure minus
Scrubber Outlet Pressure.
Main Motor
AC induction motor that is coupled to and drives the
blower.
Blower Package PLC Operation Manual •Vilter/Emerson • 35391BLP