Emerson Tescom ER5000 Series - Page 145

ER5000 —
145
The ERTune™ Program: Basic Features
The Setpoint Panel
The elds in this panel allow you to select a setpoint source for
tuning the ER5000 and set the parameters of the tuning session.
Selecting a Setpoint Source
The top panel of the Tuning Tab allows you to select a setpoint
source and set the parameters for the tuning.
IMPORTANT
!
IMPORTANT
!
The setpoint source you select for tuning is also the
setpoint source for the controller during standard operation.
To select a setpoint source
1. Click the Down Arrow (
▼
) of the Setpoint Source drop-down list.
2. Select your setpoint source from the four choices:
Analog Input Setpoint Source
This is the default setting. When this is selected, the ER5000
accepts setpoint from an analog input (4–20 mA or 1–5V analog
signal). The ER5000XV-1 model accepts a 0–10V analog signal.
ERTune Program
When this is selected, the ERTune™ program generates setpoints
based on values you have entered in the program. There are two
tuning modes: Toggle and Ramp.
Profile
When this is selected, the ER5000 follows the command sequence
of the Prole that is currently loaded in the ER5000.
External Device Setpoint Source
When this is selected, the ER5000 accepts digital setpoints (USB
or RS485) from an external device such as a PC. The setpoint
source must be separate from the PC that is currently running the
ERTune™ program.
ERTune Program
Toggle Mode Setpoint Source
In Toggle Mode, the ERTune™ program generates step changes
between two setpoints. Typically, setpoint values are set at 25%
and 75%. Optimal tuning generally requires multiple sessions at
different toggle settings.
IMPORTANT
!
IMPORTANT
!
Final tuning should always be done at pressures that
accurately reect the actual operational conditions of your application.
To set the two setpoint values
1. Enter a minimum and maximum value in the Setpoint 1 and
Setpoint 2 entry elds.
You can enter minimum and maximum values in either eld.