Altronic DE-3000 - Page 14

DE-3000 IOI 7-17
All rights reserved © ALTRONIC, LLC 2017
14
RUNNING
CH01/A01 42.3 PSIG
SETPOINT ~ 42.2 PSIG
P:45% I: 1s D:450m
AUTO 58%
↑
UNITS
PRESS TO
CHANGE
VALUE
ENTER
PRESS TO
ACCEPT
NEW
NUMBER
RUNNING
CH01/A01 42.3 PSIG
SETPOINT 42.2 PSIG
P:45% I: 1s D:450m
MANUAL ~ 58%
↑
UNITS
PRESS TO
CHANGE
VALUE
PRESS TO
CHANGE
MODE
F1
The second control loop, CONTROL LOOP #2, is accessed by pressing the NEXT
key twice from the HOME screen. This second loop can be set as a second in-
dependent PID loop (like LOOP #1), a CASCADE RPM controller, or a LINEAR/
RAMP controller. If used for a second PID loop, the control is based on the analog
input of Channel 02. In addition to controlling the 4-20mA output, based upon
the channel 02 analog voltage, a closed loop control of the input frequency being
measured by the RPM input Channel S01 is also possible. The selection of which
channel acts as the control input is made when programming the unit from the
PC Terminal program. In order to change the tuning values for LOOP #2 from the
LOOP #2 screen, the same key sequence as for LOOP #1 is used.
When CONTROL LOOP #2 is used for CASCADE RPM control or LINEAR/RAMP
control, the analog input on Channel 01 is used to drive the output on A02.
CASCADE RPM control enables engine speed to be controlled based on the
control setpoint on LOOP #1. Once LOOP #1 is forcing a maximum output, en-
gine speed will increase up to a maximum RPM in order to achieve the control
setpoint on Channel 01. LINEAR/RAMP control maps Channel 01 setpoints to
defined 4-20 mA states (mapped to RPM values) on A02. This can be set up
for either direct or inverse acting. LINEAR/RAMP control can be initiated either
after a specified warmup time or the time when input on Channel 26 surpasses
its low control setpoint.
For a Linear/Ramp Control example, assume the unit is programmed as follows:
Linear/Ramp Control for suction pressure on Channel 01
Low setpoint = 5.0 PSIG at 6mA
High setpoint = 20.0 PSIG at 18mA
This will then create a graph as follows (page 15):
CH01/A01 42.3 PSIG
SETPOINT ~ 42.2 PSIG
P:45% I: 1s D:450m
AUTO 58%
CH01/A01 42.3 PSIG
SETPOINT 42.2 PSIG
P:45% I: 1s D:450m
MANUAL ~ 58%