TECO F33 Series, Instruction Manual, Page: 43 / 192

40 Main Features
7.6 Pump function
7.6.1 Introduction
A maximun of 4 pumps can be controlled with the
standard F33 variable speed drive.
If I/O Board options are installed, a maximum of 7
pumps can be controlled. The I/O Board can also be
used as a general extended I/O.
The Pump Control function is used to control a number
of drives (pumps, fans, etc., with a maximum of 3 addi-
tional drives per I/O-board connected) of which one is
always driven by the F33. Other names for this kind of
controllers are ‘Cascade controller’ or ‘Hydrophore con-
troller’.
Depending on the flow, pressure or temperature, addi-
tional pumps can be activated via the appropriate sig-
nals by the output relays of the F33 and/or the I/O
Board. The system is developed in such a way that one
F33 will be the master of the system.
Select relay on the control board or on an option board.
The relays are set to functions for controlling pumps. In
the pictures in this section, the relays are named
R:Function, e.g. R:SlavePump1, which means a relay on
the control board or on a option board set to function
SlavePump1.
Fig. 45 Flow control with pump control option
All additional pumps can be activated via an VSD, soft
starter, Y/
or D.O.L. switches.
Fig. 46 Pressure control with pump control option
Pumps in parallel will operate as a flow controller, See
Fig. 40.
Pumps in series will operate as a pressure controller
see Fig. 41. The basic control principle is shown in Fig.
42.
Fig. 47 Basic Control Principle
NOTE: Read this instruction manual carefully before
commencing installation, connecting or working with
the variable speed drive with Pump Control option.
Δ
FLOW /
PRESSURE
Add pump
FREQUENCY (master pump P)
Stop pump
P1=on P2=on P3=on P4=on P5=on P6=on
P=on
TIM E
FLOW /
PRESSURE
(50-PC-3_1)