Data Flow Systems TCU800, Installation And Operation Manual

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Note: If the Low float is not going to be used, it must be disabled in the TCU’s local configuration for the TCU’s pump
control operations to function normally in automatic. Failing to disable the Low float configuration in this situation, results
in a false alarm condition, which fails the transducer.
Staging Levels in Analog System
Pumps are automatically started and stopped based on staging levels. The illustration below shows the behavior of pumps
at each staging level in an analog system. Both a lift station (pump down mode) and a storage tank (pump up mode) are
shown.
Staging Levels in Pump Down Mode (Analog System)
This chart describes the normal function of the TCU’s eight staging levels when used in Pump Down mode, such as that
used in a lift station. Note that not all of these levels must be configured for a lift station. The minimum number of levels
required depends on the type of station – simplex (one pump), duplex (two pumps), or triplex (three pumps).
Low Level
All pumps are stopped and alarms are activated. Low is active when the well’s
level is
below Low level. Must be set below all other levels.
Lead Off Level
Minimum operational level of a well. Lead pump is stopped when the well’s
level is
below the Lead Off level.
Lag Off Level (duplex and triplex
stations only) Lag (second) pump is stopped. Lag Off is active when the well’s level is below
Lag Off level.
Lag2 Off Level (triplex stations only)
Lag2 (third) pump is stopped. Lag2 Off is active when the well’s level is below
Lag2 Off level.
Lead Level
Lead (first) pump is started. Lead is active when the well’s level is above the
Lead level.
Lag Level (duplex and triplex stations
only) Lag (second) pump is started. Lag is active when the well’s level is above the
Lag level.
Lag2 Level (triplex stations only)
Lag2 (third) pump is started. Lag2 is active when the well’s level is above the
Lag2 level.
High Level
All pumps are stagger started and alarms are activated. High is active when the
well’s level
reaches High level. Must be set above all other levels.
Staging Levels in Pump Up Mode (Analog System)
This chart describes the normal function of the TCU’s eight staging levels when used in Pump Up mode, such as that
used in a storage tank. Note that not all of these levels must be configured for a lift station. The minimum number of
levels required depends on the type of station – simplex (one pump), duplex (two pumps), or triplex (three pumps).
High Level
All pumps are stopped and alarms are activated. High is active when the tank’s
level is
above
High level. High must be set
above
all other levels.