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3. Function
Piston dosing pumps of the FEDOS series are used in industry, in the process engineering sector, as well as
in water conditioning and the treatment of waste water.
FEDOS E
The FEDOS E is used when no control is required for constant dosing. For this the voltage supply is connect-
ed directly to the terminal box of the motor. To adapt the dosing capacity the stroke length can be adjusted
manually from 0 … 100%, or the motor speed is controlled by means of a separate frequency converter.
The FEDOS E is optionally available with remote electrical stroke-length adjustment (ATE servomotor).
The FEDOS E can be operated in Zone 1 potentially explosive atmospheres if the corresponding drive is
taken into account. Further information can be found in section 12.
FEDOS DX
The "intelligent" FEDOS DX is used if the dosing pump is to be integrated in controls or automatic control
systems. It enables versatile adaptation to a variety of different control signals and system monitoring
equipment. The signals required for external activation of the dosing pump can be from simple potential-
free N.O. contacts of water meters or controllers, or analogue 0/4 … 20 mA signals. For contact actuation
(pulse control), the stroke frequency can be adapted by division or multiplication. For internal operation (own
stroke), the dosing pump can be adjusted continuously between 0 and max. 142 strokes/min, depending on
version.
Principle of operation
a
Piston rod
b
Return spring for suction stroke
c
Tappet plate
d
Drive cam
e
Stroke limiting cam
Like the roller bearings, the worm gear set of the
single-speed gear runs in an oil bath. Dosing takes
place when the rotation of the drive cam
d
causes
movement of the piston rod
a
. The suction stroke
is produced by the return movement due to spring
force. The stroke length is adjusted by limiting the
tappet return movement using a manually adjust-
able cam disk (stroke limiting cam
e
) as stop. The
adjustment range is from 0 to 100%.
a
b c
d
e
min.
max.
max.
8
| Operating Manual FEDOS E/DX | Function