DE-3000+ IOI 8-15
All rights reserved © ALTRONIC, LLC 2015
67
GLOSSARY:
INVERSE ACTING
When describing control or actuator functions, inverse act-
ing 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 at-
tempt 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
signal that a starting attempt is about to begin.
PRIMARY CONTROL
The primary control is a closed loop based upon an in-
put value selected from channels 01, 02, or 03. The
throughput of the compressor is adjusted by the control-
ler to maintain this setpoint.
PROPORTIONAL BAND
The proportional band is used to tune the response of
the controller to the characteristic behavior of the equip-
ment 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 propor-
tional 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 mea-
sured 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 person-
nel. 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.
