Sera 409.2 ML Series, Руководство по эксплуатации, Страница: 13 / 36

Multi-layer diaphragm pump
Serie 409.2 ML
Operating instruction
TA 431 Rev. 8 en 06/2015
Technical modifications reserved!
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7.2.2.2 Manual stroke length adjustment by
a dial scale with indication of percent
(option)
The stroke length is adjusted by turning the hand wheel. The
stroke length can be adjusted both during operation and
standstill (in unpressurized condition) of the pump.
Turning counter-clockwise

the effective stroke length
(see Fig. 08) increases, the
delivery rate increases.
Turning clockwise

the effective stroke length
decreases, the
delivery rate decreases.
The adjusted stroke length
can be read off the percent
scale (the example shows a
set stroke length of 65%).
Fig. 08 Stroke length adjustment with position indicator
In delivery state, the stroke length adjustment is factory set to
50%.
CAUTION!
The dial scale with indication of percent may become
misadjusted during transport.
If the indicator does not match the 50% setting, then the
percent scale must be re-adjusted during operation(!) of
the pump!
Set screw
Hand wheel
(Adj. spindle)
Dial scale with indication of percent
Fig. 09 Stroke length adjustment with position indicator
Adjusting the percent scale:
•
switch the multi-layer diaphragm pump on
•
loosen the set screw
•
remove the percent scale from the hand wheel
•
manually turn the percent scale to 0% setting
•
use the hand wheel to set the stroke length to 0%. Turn
hand wheel clockwise until there is no further stroke
movement (push rod does no longer hit the adjusting
spindle)
•
insert percent scale again
•
use the set screw to secure the percent scale to the hand
wheel
•
adjust desired stroke length
7.2.2.3 Automatic stroke length adjustment
by an electrical actuator
The electrical actuator is directly mounted to the stroke mech-
anism of the dosing pump. A clutch transmits the rotary motion
of the actuator driveshaft to the adjusting spindle. The axial
displacement is compensated in the clutch.
Dosing pump
Actuator
Stroke Clutch
mechanism
Abb. 10 Stroke length adjustment by actuator
In case of dosing pumps with electrical actuator, a manual ad-
justment of the stroke length on the pump is no longer possi-
ble.
(Exception: actuator with hand wheel)
The actuator is standardly equipped with two integrated limit
switches and a position potentiometer for position feedback.
Both limit switches are factory set so that the drive will switch
off at a stroke length of 0% and 100%, even if a control voltage
is applied.
This guarantees that adjustments can only be made within the
permissible range. The position potentiometer is driven by a
safety clutch which prevents damage caused by incorrectly
adjusted limit switches.
Activation is performed by appropriate control units (see sera -
accessories)