Festo SRAP-M-CA1- Série Notice D'utilisation page 5

Sensor box
SRAP-M-CA1-...
(en) Operating instructions
Original: de
Sensor box SRAP-M-CA1-... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Operating elements and connections
1
2
4
a
aD
aC
aB
8
a
aA
1
Cover with plastic cap
2
Socket head screws (M5)
3
Indicator ring of the position
indicator
4
Sections of the position indicator
5
Shaft
6
Baseplate
7
Teach button
8
Mounting screws
(captive)
Fig. 1: Design, operating elements and connections of the sensor box
Festo SE & Co. KG
Postfach
D-73726 Esslingen
++49/711/347-0
www.festo.com
8001065
1110a
aJ 9
9
LED (yellow) – status display for
teach procedure
aJ
Earth terminal
aA
Terminal strip
aB
LED (green) – power supply
indicator
aC
Magnet holder
aD
Cable connector (max. 2)
a = included separately
2 Design
The sensor box SRAP is contained in a sturdy aluminium housing. A transparent
plastic cap in the cover allows the three-dimensional visual position indicator to be
Fig. 1 1 ). A shaft (
seen (
baseplate, and is linked mechanically with the position indicator. On the sides, the
sensor box has up to two cable connectors, depending on the model (
The visual position indicator is comprised of sections. The sections can be put
together so as to display the flow paths of single-way or multiple-way valves
Fig. 1 3 and 4 ).
(
The housing contains the device electronics and a 9-pin terminal strip for electrical
Fig. 1 aA ). The device electronics include an analogue sensor which
connection (
picks up the movement of the shaft via a co-rotating magnet (
converts it into an analogue current signal.
The device electronics also include a microcontroller which conditions the sensor
signal so that the start and end point of the measuring range can be defined indivi-
dually using a "teach" procedure.
Four captive mounting screws (
for mounting it mechanically on quarter-turn actuators having a mechanical in-
terface in accordance with VDI/VDE Guideline 3845 (hole pattern 30 x 80 [mm] ).
The sensor box SRAP is available in various designs. Position indicators can be
supplied in a range of colours and materials, and with a number of cable connector
options.
Features
Sensor function
English
Product design
Design
Mechanical interface
Type of display
2
Measuring range
Nominal operating voltage
Output signal
Electrical connection
Valve connection
3
Cable connection
4
Blue, green or yellow for valve open; black or red for valve closed
1)
To relay the control signal for a solenoid valve through the sensor box
2)
Fig. 2: Type code of the sensor box SRAP
3 Function
5
The rotation of the quarter-turn actuator and valve mounted under the sensor box
is transmitted to the shaft of the sensor box. The shaft transmits the rotation to
the visual position indicator.
The visual position indication shows whether the valve is open or closed. When the
6
valve is open, the indicator ring (
the flow path. A raised indicator ring indicates that the valve is closed.
1
Indicator ring is
7
lowered (valve
open)
2
Indicator ring is
raised (valve
closed)
8
The rotation of the shaft is evaluated with the aid of the co-rotating magnet by a
magnetically sensitive sensor element. The sensor signal is conditioned and output
as an analogue current signal. The sensor box SRAP returns an angle-proportional
output signal of 4 mA ... 20 mA within the taught measuring range.
If the end points of the defined measuring range are exceeded by up to 7.2° the
active output signal is kept constant (as a buffer to compensate for seal wear in
the process valve). If this range is exceeded (> 7.2°), an output signal of 2 mA is
generated (out of range).
Two internal LEDs supply status information (visible during commissioning while
the housing cover is not in place). The green LED (
operating voltage is correct. The yellow LED (
tion about the teaching procedure. The teaching procedure allows the end points
of the measuring range to be set individually within the available turn angle
(0 ... 270°).
Fig. 1 5 ) leads outwards from the centre of the
Fig. 1 8 ) in the baseplate of the sensor box are
Type code Description
SRAP– Sensors for angular position, analogue, series P
M– Mainly metal
C Box module
A1– Direct mounting, hole pattern 30 x 80 mm
Without display
1)
BB Blue/black
1)
GR Green/red
1)
YB Yellow/black
270– Angle of rotation 0 ... 270°
1– 24 V DC
A– 4 to 20 mA
T Terminal box (terminal strip)
No valve connection
2 With valve connection (two cable glands)
M20– With cable gland M20, metal
P20– With cable gland M20, polymer
Fig. 1 3 ) is lowered and the sections indicate
1
Fig. 3: Example – display for single-way valves
Fig. 1 aB ) lights up when the
Fig. 1 9 ) supplies status informa-
Fig. 1 aD ).
Fig. 1 aC ) and
2)
2