DE-3000 IOI 7-17
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GLOSSARY:
INVERSE ACTING When describing control or actuator functions, inverse acting
is used to identify relationships where the controller must
decrease its output to cause an increase in the variable.
MAXIMUM RPM The maximum RPM setting is the highest governor set-
point value which will be sent by the controller in an
attempt to satisfy the primary control setpoint. The maxi-
mum running RPM.
MINIMUM RPM The minimum RPM is the governor setpoint value which
will be sent by the controller after the warmup delay time
has been fulfilled. The minimum RPM is the speed which
must be Seen by the controller to allow loading of the
compressor to begin.
OVERCRANK TIME The maximum time that the starting device will remain
energized by output #3 before the starting attempt is
considered failed. If an overcrank occurs, the crank dis-
connect RPM is not reached before the overcrank time,
then an overcrank fault has occurred.
PRE-LUBE TIME A user programmed time for which output #4 will remain
ON after the beginning of an AUTO START sequence.
Normally used for control of a pre-lube pump and to sig-
nal that a starting attempt is about to begin.
PRIMARY CONTROL The primary control is a closed loop based upon an input
value selected from channels 01, 02, or 03. The through-
put of the compressor is adjusted by the controller to
maintain this setpoint.
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 accom-
plished 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 ca-
pacity 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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