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7 - Boiler Controls
CEJS boilers feature an integral control panel housing the PLC -based control system components and
the touchscreen HMI. The HMI screens are described below.
7.1- Main Menu
The Main Menu appears on power-up. This
screen allows user login for access to password-
protected features and serves to navigate to
other control screens.
7.2-Overview
The Overview screen monitors critical data
during boiler operation, and is the primary
control screen for commissioning and starting up
the boiler. This screen contains operating
controls, status messages, and transmitter data
including a graphic/ numeric indicator to show
control shield position and numeric displays for:
• Steam pressure and water level
• Steam header valve and water valve
position
• Water conductivity
• Power output to the electrodes
• Power limit
• Steam Production
In "Test" mode, the position of the shield can be adjusted by pressing the "Raise" button to elevate and
the "Lower" button to descend. The "Col. Blowdown" button allows the user to set a timer to inhibit the
low level alarm while a column blowdown is being performed. Other on-screen indicators are as
follows:
• Feedwater Valve Limit Active - Indicates that the pressure setting to limit the feedwater valve
position is enabled. See Operating Setpoints, Press to Limit FW Vlv%, or Software Switch
Setpoints, PSLL settings for more details.
• MH Power Limit Is Enabled - Indicates that the Power Limit setpoint on the Operating Setpoints
screen has been enabled.
• Conductivity Too High and Pressure Too Low - Indicates that the conductivity level is too high
in comparison to the pressure level of the boiler. The conductivity level is below the lower limit
for start-up. See Software Switch Setpoints, CSL setting for more details.
750-272
Electrode Boiler
17
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