Festo SRBF-C Série Notice D'utilisation page 4

Limit switch attachment
SRBF-C...
(en) Operating instructions
Original: de
Limit switch attachment SRBF-C...
1 Control sections and connections
1
3
aB
aA
aJ
9
8
1
Housing cover
2
Plastic hood with position
indicator (yellow/red)
3
Mounting screws for housing cover
4
Shaft
5
Micro switches
6
Cams (red, yellow)
Fig. 1 Design of control sections and connections of the limit switch attachment
2 Design
The SRBF-C limit switch attachment has a robust aluminium housing.
A transparent plastic hood in the cover allows a view of the three-dimensional
Fig. 1 2 ). Connected to the position indicator is a
optical position indicator (
Fig. 1 4 ), which passes through the back plate to the outside.
shaft (
The housing contains two micro switches (
Fig. 1 6 ) on the shaft. Through adjustment of the cams, the
actuated by cams (
desired switching points of the two micro switches can be set. Spring force presses
the cams onto toothed discs and in this way fixes the shaft in place (
To set the cams, they can be released from the toothed disc by pressing against
the spring force. The micro switches are designed as changeover switches
( terminal diagram in Fig. 5).
Festo SE & Co. KG
Postfach
D-73726 Esslingen
+49 711 347 0
www.festo.com
8005083
1206b
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
7
Mounting adapter – design
depends on the type
8
Back plate
9
Earth terminal (PE)
aJ
Cable connector
aA
Terminal block (8-pin)
aB
Spring
Fig. 1 5 ), which are mechanically
An 8-pin terminal block (
connection. On the side, the limit switch attachment has a cable connector for the
Fig. 1 aJ ).
wiring (
On the opposite side, the housing is prepared for mounting an additional cable
connector for passing on the control signal for a solenoid valve (
diagram in Fig. 5).
Four threaded holes in the back plate are used to fasten the mounting adapter.
This allows mounting of the semi-rotary drives with mechanical interface as per
VDI/VDE Directive 3845.
The SRBF-C limit switch attachment can be supplied with four different
premounted imounting adapters (hole pattern and shaft height
Characteristics
Type
Design
Mechanical interface
Type of indicator
Measuring range
English
Sensor principle
Nominal operating voltage
Electrical connection
Cable connector
1) For details technical data in section 13
2
Fig. 2 Type code of the SRBF-C limit switch attachment
3 Function
3
The rotary movement of the semi-rotary drive with process valve mounted below
the limit switch attachment is transmitted to the shaft (
switch attachment. The shaft transmits the rotary movement via cams
Fig. 1 6 ) onto the integrated micro switches (
(
position indicator (
4
process valve is open or closed. If the process valve is open, "Open" is displayed
on a yellow background. "Closed" on a red background shows that the process
5
valve is closed.
1
6 Process valve
open:
"Open" (yellow)
2
Process valve
closed:
"Closed" (red)
Actuated micro switches switch (changeover switch,
The corresponding electrical signal is present at the electrical connection. This can
Fig. 2 be passed on to higher-level systems for evaluation.
4 Application
The SRBF-C limit switch attachment is intended for recording, forwarding and
displaying of the end positions of semi-rotary drives in process automation
systems. And so the valve setting (open or closed) of the operated process valve is
recorded through the limit switch attachment.
Suitable for operation are semi-rotary drives for actuating butterfly valves and ball
valves in media-flow process valves (quarter-turn actuators) with slow movements
and few cycles.
Permissible are semi-rotary drives with mechanical interface as per
VDI/VDE Directive 3845, for which suitable mechanical adapter bridges are
available ( www.festo.com/catalogue).
The maximum swivel angle of the limit switch attachment is 90°. The SRBF-C limit
switch attachment is suitable for use in the process industry and in an industrial
environment. The product is tailored to the requirements of the process industry
( catalogue www.festo.com/catalogue).
Fig. 6).
Fig. 1 aA ) inside the housing provides the electrical
Type code Description
SRBF– Limit switch attachment
C Sensor box
A3– Mounting adapter, hole pattern 30 x 80 mm,
for drives with shaft height 20 mm
A4– Mounting adapter, hole pattern 30 x 80 mm,
for drives with shaft height 30 mm
A5– Mounting adapter, hole pattern 30 x 130 mm,
for drives with shaft height 30 mm
A6– Mounting adapter, hole pattern 30 x 130 mm,
for drives with shaft height 50 mm
YR Position indicator yellow/red
90– 0 ... 90°
MW– Floating contact, changeover switch
1)
22A– 250 V AC
C2 Screw terminal
M20– M20x1,5, metal
Fig. 1 5 ) and the optical
Fig. 1 2 ). The optical position indicator shows whether the
1
Fig. 3 Position indicator (yellow/red)
terminal
Fig. 2).
Fig. 1 4 ) of the limit
2
terminal diagram in Fig. 5).