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GLOSSARY (continued):
PROPORTIONAL BAND The proportional band is used to tune the response of the
controller to the characteristic behavior of the equipment being
controlled. Proportional band is the inverse of gain expressed
as a percentage. A proportional band setting of 10% is equal
to a gain setting 10, a proportional band setting of 20% is equal
to a gain of 5, etc. The smaller the proportional band setting the
greater the controller response to a difference between the
measured value and the setpoint.
RPM CHANGE / CYCLE The maximum RPM change per cycle is used to limit the rate at
which the controller output to the governor will be allowed to
change. This limit is used to avoid rapid speed changes during
transient conditions.
SAFETY SHUTDOWN Safety shutdown setpoints are those which cause the protected
equipment to be shutdown or stopped in order to protect the
equipment and or the operating personnel. These setpoints
must be selected to be outside the range of normal operation.
SECONDARY CONTROL Secondary or supplemental control functions are accomplished
by sensing user programmed control setpoints. LOAD INHIBIT
or FORCE UNLOAD strategies, as well as alarms or corrective
actions can be implemented.
THROUGHPUT The total volume of gas per unit of time moved by the
compressor. Throughput is varied by both speed and capacity
adjustments made by the controller.
WARMUP DELAY The warmup delay time is user programmable from 0 to 99
minutes. This allows for the engine/compressor to run
unloaded for this time delay as part of the auto start sequence.
The engine speed output to the governor will be held at the idle
RPM value during the warmup delay.
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