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• Shield Pulse Off Time (sec)
Defines the amount of time the hydraulic shield contactor remains de-energized (Off) during the shield
pulse.
• Shield Pulse On Time (sec)
Defines the amount of time the hydraulic shield contactor remains energized (On) during the shield
pulse.
• Shield Pulse Enable (%)
Defines the percentage of the MW limit in which to enable the shield to begin pulsing. Shield pulsing
allows for fine tuning as the boiler nears the set MW limit. Setting this value to 0% always enables the
shield to pulse. Setting this value to 100% never enables the shield to pulse.
Example: If the output limit is set to 10 MW and the Shield Pulse Enable% setpoint is established to
be 90%, then the shield pulse will be enabled at 9 MW output.
• Steam Flow for 2 Element (%)
Defines the steam flow output percentage limit at which the two element feedwater system is enabled.
The two element feedwater system is based on the water level and calculated steam output determined
from the MW reading.
• FW Temp for Steam Calc (DgF)
Defines the temperature value (degress Fahrenheit) used to calculate steam flow based on the current
MW reading of the boiler. This value is used when there is no temperature input to the system.
7.12c - Software Switch SetPoints
The Software Switch SetPoints (Soft Switch SPs)
screen allows the user to adjust the setpoints for the
various transmitter driven functions of the boiler.
These parameters are set by Cleaver Brooks and
should only be changed by qualified and authorized
personnel. The user must be logged on to modify
these factory setpoints. This screen is accessed from
the Factory Settings screen.
The following is a descriptive list of the software
switch setpoint variables:
• Water Level Switches (%)
LSLL: Low water limit which triggers the low water boiler shutdown.
LSM: Median water limit which allows the boiler to start-up after this level is achieved.
LSHTR: Low water limit which disables the operation of the heater when the water level drops below
this setpoint.
750-272
Electrode Boiler
25
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