Bell & Gossett P2001489 Integrated Technologic with Sensorless Control - Manual (Page 34)

head generated at this flow and speed is set at Pressure at Rated Speed (parameter
22-88). Knowing points A, C and D allow the controller to calculate point E along with the
control curve which includes point B (speed, pressure and flow at design speed). Refer to
the diagram below.
Figure 18: Flow compensation with sensorless control disabled and speed at system design
working point is unknown
Table 12: Flow compensation parameters when speed at design point is unknown
Parameter number Description Set to
22–80 Flow compensation Enabled
22–81 Square-Linear-Curve approximation Modify between 100% (square) and 0%
(linear) per system requirements.
22–82 Work point calculation Enabled
22–84 Speed at no flow (Hz) To find this point, close all valves in the system
and run the pump at the minimum design
head. The speed corresponding to the
minimum head requirement at no flow will be
entered here.
22–87 Pressure at no flow System pressure at no flow and no flow speed.
This is the minimum design head.
22–88 Pressure at rated speed This point corresponds to the head developed
at design flow and rated speed. This value can
be defined using the pump performance
curve.
22–89 Flow at design point This point corresponds to the system design
flow.
22–90 Flow at rated speed This point corresponds to the flow at rated
speed. This value can be defined using the
pump performance curve.
Commissioning
NOTICE:
The factory default settings are configured to require a start signal to be wired to DI18.
For fast and easy installation, the controller has been preprogrammed with 4 different set-
ups. Each set-up is configured for a different application. The set-ups contain parameters
that are preset for the given application.
Set-up
1 has been configured for constant pressure control with a wired pressure
transducer. The pressure transducer input is configured for a transducer with a
maximum output at 40psi. The setpoint is preset to 15psi. Connect transducer
feedback to AI53. Be sure to properly set the analog input configuration switch
A53 to match the sensor output type (U = 0-10V output, I = 4-20mA output).
System Setup and Operation
32 Integrated Technologic ® with Sensorless Control INSTRUCTION MANUAL