SRBE-...-C1
limit switch box
Festo SE & Co. KG
Ruiter Straße 82
73734 Esslingen
Deutschland
+49 711 347-0
www.festo.com
Operating instructions
8176802
2022-06b
[8176804]
Translation of the original instructions
© 2022 all rights reserved to Festo SE & Co. KG
1
Identification EX
Identification
Type
Class I, Division 1, Groups C, D
Class II, Division 1, Groups E, F, G
Class III; Temperature Code T4A
Ex d IIB T5 Gb; Ex tb IIIC T108°C Db
Class I, Zone 1, AEx d IIB T5 Gb
Class II, Zone 21, AEx tb IIIC T108°C Db
SRBE-CA3-YR90-MW-22A-1W-... – only Div.1
SRBE-CA3-YR90-MW-22A-2W-... – only Div.1
SRBE-CA3-YR90-N-20N-ZC-... – Div.1 and 2
SRBE-CA3-YR90-N-1-P-... – Div.1 and 2
SRBE-CA3-YR90-N-1-N-... – Div.1 and 2
SRBE-CA3-YR90-N-1-ZU-... – Div.1 and 2
SRBE-CA3-YR90-R-2A-1W-... – Div.1 and 2
Class I, Division 2, Groups A, B, C and D
Class II, Division 1, Groups E, F and G
Class III; Temperature Code T4A
Ex nA IIC T5 Gc; Ex tb IIIC T108°C Db
Class I, Zone 2 AEx nA IIC T5 Gc
Class II, Zone 21, AEx tb IIIC T108°C Db
Certificate: CSA-EX-2885024; Ex protection - CSA Canada and USA
Tab. 1: Identification EX
2
Applicable documents
NOTICE
Technical data for the product can have different values in other documents. For
operation in an explosive atmosphere, the technical data in this document always
have priority.
All available documents for the product
3
Safety
3.1
Safety instructions
The device can be used under the stated operating conditions in potentially
explosive gas atmospheres, and in potentially explosive dust atmospheres.
3.2
Intended use
The intended use of the product is to record and display the end positions and
intermediate positions of pneumatic drives.
3.3
Training of qualified personnel
Work on the product may only be carried out by qualified personnel who can
evaluate the work and detect dangers. The qualified personnel have skills and
experience in dealing with electrical (open-loop) control technology.
3.4
CSA certification
Fitting and commissioning is to be carried out by qualified personnel only in
accordance with the operating instructions.
The personnel must have several years of training and experience in installing and
commissioning electrical and pneumatic industrial control systems.
•
Please observe the applicable safety requirements and standards.
Conversion or extension of the product with modules, for which the Recognized
Component Mark of CSA does not apply, will lead to loss of the CSA certification.
•
Contact Festo if you require information on CSA-certified modules.
Only when connected in potentially explosive areas
Wiring to or from this device, which enters or leaves the system enclosure, must
utilize wiring methods suitable for Class I, Division 2 (or Division 1) Hazardous
Locations, as appropriate for the installation.
Enclosure Environmental ratings are achieved when conduit entries are torqued
to at least 90.4 Nm (800) lbs/inch) and fasteners (Class A2-50) to 40 Nm (354 lbs/
inch) not-lubricated conditions.
Use field wiring suitable for 95 °C.
Class I. Division 1. Groups C and D
–
Open circuit before removing cover.
–
Keep cover tight while circuits are alive.
–
Seal required within 18 inches.
Class I. Division 2. Group A. B. C and D
WARNING
EXPLOSION HAZARD
Substitution of components may impair suitability for Class I, Division 2.
WARNING
EXPLOSION HAZARD
Do not connect while circuit is alive unless area is known to be nonhazardous.
4
Additional information
–
Contact the regional Festo contact if you have technical problems
–
Accessories and spare parts
5
Product overview
1
2
3
4
5
6
7
8
9
Fig.1
1
Position indicator
2
Housing cover
3
Housing screws
4
Shaft with cam
5
Proximity switch
6
Terminal strip
7
Protective earthing (PE) on the inside
and outside of the housing wall
8
Cable entry M20x1.5 or 1/2 NPT
9
Mounting adapter with M5x8 retaining
screws
Default settings on delivery:
–
Position indicator “closed”
–
Switching point for “open” 90° anti-clockwise
6
Function
The limit switch box is used for the detection and electrical and optical feedback
of the end positions of a drive. The limit switch box is suitable for operation
with semi-rotary drives with a mechanical interface in accordance with VDI/VDE
Guideline 3845.
7
Installation
WARNING
Carry out the commissioning, service and inspection outside of the explosive
atmosphere. Disconnect the power supply before this work and secure against
reconnection.
1. Close the process valve.
2. Place the limit switch box with the mounting adapter on the drive and align it.
–
Avoid axial load of the drive shaft.
3. Fasten the mounting adapter to the drive.
–
Lock the retaining screws. Tightening torque: 6 Nm ± 10%
Mounting adapter
Observe the tightening torque when replacing the limit switch attachment.
–
Tightening torque between mounting adapter and limit switch box: 10 Nm
± 10%
8
Electrical connection
WARNING
Before switching on the electrical circuit in potentially explosive atmospheres:
• Mount the cover securely on the housing.
• Connect with potential equalisation.
WARNING
Use cable connectors of type of (ignition) protection Ex-d and a degree of protec-
tion of at least IP67. Seal unused cable entries with blanking plugs.
NOTICE
Thread of the cable guide depends on the product variant: M20x1.5 or 1/2 NPT
Cable fittings must be appropriate for the corresponding thread type. Cable con-
nector threads must not protrude into the interior of the housing.
