STANDARD CONTROL SYSTEM FEATURES |
ACS-1 This system features
a NEMA 4 rated (water and
dust tight) panel box complete
with adjustable timer, differential pressure override, 10 amp
control relay for backwash
valve activation, display lights
to indicate Power On,
Backwash Valve Open, and
High Differential Pressure.
A selector switch is also
included to manually control
the backwash valve functions
of Off-On-Auto. The panel also
has contact terminals for a
motor starter and an external
alarm connection. The panel
requires 110 VAC input, UL
approval is available as an
option. The panel has a differential pressure switch and an
electrically actuated ball valve
that controls the backwash
function.
ACS-2 This system has all
of the features of the ACS-1
and includes a motor starter in
addition to the other standard
equipment.
ACS-3 This system has
all of the features of the
ASC-2 system and includes
a 460V/120V step down
transformer.
Optional designs to meet
specific requirements with
special wiring arrangements,
panel boxes (NEMA 7, 9),
control valves, and air actuation among others, can be
furnished.
The automatic intermittent mode is adjustable by
setting the timer in the panel
that controls the frequency of
backwashing and the “open”
time of the backwash valve.
Field adjustments should be
made to suit the application.
A differential pressure switch
to initiate backwashing under
high load conditions also can
be adjusted.
The continuous
backwashing mode is
recommended where the
backwashing fluid can be
recycled to its source or
when very high solid loadings
are encountered.
In both the automatic intermittent and continuous backwashing modes the backwash
arm continuously rotates at a
low 2-4 RPM.
Motors
An electric motor and
gear box are furnished as part
of the strainer. The standard
TEFC motor is 120V/220V,
Single phase 60 Hz, or
230V/460V Three Phase 60 Hz,
at customer option. Other
motors are available.
Differential Pressure Switch
A diaphragm-type
differential pressure switch is
a standard component in all
Control Systems. It compensates for sudden high pressure
loading by overriding the time
cycle and initiating backwashing. The differential
pressure setting as well as a
delay time setting can be
adjusted. Two psid above the
clean reading is the differential
setting recommended. A
delay timer will continue the
cleaning to customer’s
requirement. The time delay
can be adjusted from 0.6
seconds to 24 hours,
depending on system’s needs.
Backwash Valve Electrically
actuated (115 VAC/60 Hz) ball
valves are also standard in the
Control Systems. Materials of
construction are suitable for
water service. Other materials,
valve types and pneumatic
actuation are optional.