SKPx5.xxxUx
Electro
Ͳ
hydraulic
actuators
Technical
Instructions
Document
Number
CC1N7643us
December
10,
2018
Siemens
AG
Building
Technologies
Page
9
Specifications
Continued
Auxiliary
Proof
of
closure
switch
Non
Ͳ
adjustable
features
Setting
range
of
auxiliary
switch
40%
to
100%
of
stroke
Switch
rating
4
A
(2
A,
cos
M
=
0.3)
)
NOTE:
AUX
Ͳ
circuit
not
for
SELV
(safety
extra
low
voltage)!
Operation
(see
Figure
1)
Safety
shut
Ͳ
off
function
The
electro
Ͳ
hydraulic
actuator
consists
of
a
cylinder
filled
with
oil,
a
piston
containing
an
electric
oscillating
pump,
and
a
relief
system.
When
power
is
supplied
to
the
actuator,
the
relief
system
closes,
and
the
pump
moves
oil
from
the
reservoir
into
the
pressure
chamber.
This
action
causes
the
piston
to
move
downward
in
the
cylinder,
opening
the
gas
valve.
When
power
to
the
actuator
is
interrupted,
the
relief
system
opens
and
the
gas
valve
closes
in
less
than
0.8
seconds.
A
position
indicator,
visible
through
the
transparent
window
of
the
terminal
box
cover,
shows
the
entire
possible
stroke
range
of
the
actuator.
A
light,
which
is
visible
through
the
lower
left
transparent
window
of
the
terminal
box
cover,
indicates
when
the
actuator
receives
power.
An
optional,
non
Ͳ
adjustable
SPDT
proof
of
closure
over
travel
switch
signals
the
closed
position
after
the
gas
valve
has
closed.
An
optional
SPDT
auxiliary
switch
is
adjustable
between
40%
and
100%
of
the
stroke.
The
adjustment
screw
and
scale
are
located
on
the
right
side
in
the
terminal
box,
and
are
visible
through
the
transparent
window
of
the
terminal
box
cover.
The
sealing
gasket,
AGA66,
can
be
installed
between
the
actuator
and
the
gas
valve
to
provide
NEMA
3,
3R,
and
4
protection
rating
for
VGG10.xxxU
/
VGDxx.xxxU
/
VRD40.xxxU
valves.
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