Data Flow Systems TCU800, Installation And Operation Manual

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T C U T r a n s d u c e r C o n f i g u r a t i o n E x a m p l e s
TCU Settings (Transducer with Floats Backup)
Name Setting Description For more information, see...
Transducer type 4-20 mA or 0-5 Volts Select 4-20 mA or 0-5 Volts for
systems using analog transducers.
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Low Float Enabled or Disabled Enable this setting to use a low level
float to override normal pump control
if a transducer fault occurs.
page 54
High Float Enabled Enable this setting to use a high level
float to override normal pump control
if a transducer fault occurs.
page 54
Fault Mode Floats Select Floats to have the TCU switch
to float control when a transducer fault
occurs.
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Transducer High Float
Fault Enabled Enable to generate a transducer fault
when a high float condition occurs.
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Transducer Low Level
Fault Enabled Enable to generate a transducer fault
when a low float condition occurs.
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Bubbler Noise Fault Enabled or Disabled Enable only if the system is a bubbler
system and you want to generate a
transducer fault when the TCU doesn’t
detect air-pump induced noise.
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High Float Override Enabled or Disabled Enable this setting to give the High
float precedence in the event of an Off
float failure when the TCU is in Floats
fault mode.
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Minimum Run 1.0 Minimum time pumps should run.
Used to prevent short cycling.
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Minimum Off 0.5 Minimum time pumps should remain
off. Used to prevent short cycling.
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Response to Fault Conditions (Transducer with Floats Backup)
Fault(s) Alarms Pump Operation Behavior
Transducer low
condition
• Transducer fault
alarm
• Low well alarm
All pumps off Control switches to float inputs. Low well and
transducer fault alarms are generated. If float
inputs agree, all pumps are turned off. The low
well alarm clears if the transducer returns to
normal range. However, the transducer fault
alarm remains active and control remains with
floats until the TCU has been reset.
Concurrent off
float and lead float
conditions
Transducer fault Normal pump
operation
Example of normal operation under floats
control, regardless of which event triggered the
transducer fault.