Bell & Gossett S14334B Technologic 5500 Series Variable Primary Pump and Valve Controller - Manual (Page 2)

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Preface
The following manual describes the new microproces-
sor based Technologic 5500 Variable Primary Pump
Controller. This unit is in the tradition of the other
members of the Technologic Control Panels as it
incorporates many original, novel, and proprietary fea-
tures that may only be found on B&G controllers.
Some of these features require special emphasis here.
The controller is best described as a specific purpose
programmable pump and valve controller. This means
that the hardware and software have been created for
the control and diagnostics of pumps and valves with
consideration for their inherent characteristics. This
results in an optimum pump controller without the cost
of general purpose control hardware. Software is ded-
icated and established for the unit only after extensive
testing. Changes to this software are not taken lightly
and must pass rigid version control.
The controller has the unique analog input protection
of other members of the control family. In the event of
a short circuit condition the current limit circuitry pre-
vents failure of the analog input components.
This new controller has standard manual motor bypass
switches when a Bell & Gossett automatic bypass is
supplied. The manual motor bypass switches allow
the user to de-energize the programmable logic con-
troller and take manual control of the pumping system.
This is helpful during system startup to confirm pump
rotation and to purge air from the system prior to
switching to automatic control.