Altronic DE-3000 Quick Reference Manual

Quick Reference Guide
DE-3000 Solenoid Pulse Control
Quick Description
PID The Solenoid Pulse Control is used to control the loading/unloading of a
slide valve, also known as a load or capacity valve, in a rotary screw compressor
application. The load point is always linked to the analog input from channel
three. This can be suction or discharge pressure depending on the application.
The pulses will energize momentarily to load or unload the valve. This process
will continue to move in the unload or load direction until the desired effect is
reached. There are a total of six main adjustments; four of which can be
adjusted through the keypad.
CTD Cycle Time Delay. Adjusted from the keypad and the PC software, the value is in seconds, with a
range from 1 to 999. This adjusts the time that a pulse off signal will last. For a faster correction, a low value
would be desirable. A slower correction would require a larger value.
SPDB Set Point Dead Band. Adjusted from the keypad and the PC software, the Dead Band is the value of
no response on each side of the set point. Example: If the set point is at 20 PSIG and the Dead Band is set
to 1 PSIG the unload and load pulse outputs will not react when the pressure is between 19 and 21 PSIG.
PB Proportional Band. Adjusted from the keypad and the PC software, this accounts for preset present
values of the error. For example, if the error is large and positive, the control output will be large and
positive. The lower the number value of the Proportional Band, the longer the duration of the pulse time on
signal will be. The duration increases more as the actual value moves farther away the from the set point.
PCSP Primary Control Set Point. Adjusted from the keypad and the PC software, this is the main control
set point or target.
MDPT Max Digital Pulse Time. Adjusted with the PC software only, the default value is 1000ms. In most
cases, the Proportional Band and the Cycle Time Delay are sufficient, requiring no adjustment to this
parameter. This controls the minimum time that the pulse is on.
WUD Warm Up Delay. Adjusted with the PC software only, this prevents any control correction
adjustments until the time has expired following start up.
Two other settings for the Solenoid Pulse Control in the software are INVERSE/DIRECT (action for the control direction)
and Unload time at stop or fault. Please consult FORM DE-3000 IOI 2-17 for more information.
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This guide provides clarification
and additional information to
the Installation and Operating
Manual, Form DE-3000 IOI 2-17.
Altronic literature can be
found at: www.altronic-
llc.com in the Technical
Library.