Omron Sti SR101A User Information

Safety
Technology
& Innovation
SR101A
User Information for SR101A

Correct Use

SR101A is the low-cost emergency stop safety relay with which
machines and systems can be safely switched off by disconnect-
ing the power supply. Internal fault monitoring takes place
during restarting via the start button.
Applications for the SR101A include single or dual-channel
Emergency Stop Circuits and guard monitoring on machines and
systems.

Features

2 safe, redundant relay outputs
•
Connection of:
•
- Emergency stop buttons
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- Safety switches
- Non-contact safety switches
Single and dual-channel operation possible
•
Feedback Loop for monitoring downstream contactors or
•
expansion modules
Cyclical monitoring of the output contacts
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Indication of the switching state via LED
•

Function

The emergency stop safety switching device SR101A is
designed for safe isolation of safety circuits according to
EN 60204-1 and can be used up to safety category 3, PL d
according to EN ISO 13849-1.
The internal logical system closes the safety contacts when
the start button is pressed.
If the safety switch is opened, the positively driven safety
contacts are opened and safely switch the machine off. It is
ensured that a single fault does not lead to a loss of the
safety function and that every internal fault is detected by
cyclical self-monitoring no later than when the system is
switched off and switched on again. Only a fault in the
safety switch itself is not detected. This must be checked
regularly as part of a maintenance plan.

Installation

As per EN 60204-1, the device is intended for installation in
control cabinets with a minimum degree of protection of
IP54. It is mounted on a 35 mm DIN rail according to DIN
EN 60715 TH35.
Installation and commissioning of the device must be
•
Safety
performed only by authorized personnel
Precautions
Observe the country-specific regulations when installing
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the device.
The electrical connection of the device is only allowed to
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be made with the device isolated.
The wiring of the device must comply with the instruc-
•
tions in this user information, otherwise there is a risk
that the safety function will be lost.
When the 24 V version is used, a control transformer
Electrical
•
according to EN 61558-2-6 or a power supply unit with
Connection
electrical isolation from the mains must be connected.
External fusing of the contacts (4 A slow-blow or 6 A
•
quick-action or 10 A gG) must be provided.
A maximum length of the control lines of 1000 meters
•
with a line cross section of 0.75 mm
ceeded.
The line cross section must not exceed 2.5 mm
•
If the device does not function after commissioning, it
•
must be returned to the manufacturer unopened. Open-
ing the device will void the warranty.
2 start behaviors possible:
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- Manual start
- Automatic start
Short circuit and earth fault monitoring
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Up to PL d, SILCL 2, category 3
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Fig. 1 Block diagram SR101A
Fig. 2 Installation / removal
It is not allowed to open the device, tamper with the de-
•
.
vice or bypass the safety devices.
All relevant safety regulations and standards are to be
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observed.
The overall concept of the control system in which the
•
device is incorporated must be validated by the user.
Failure to observe the safety regulations can result in
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death, serious injury and serious damage.
2
must not be ex-
2
.
(not for the plug-in terminals)
A1: Power supply
A2 : Power supply
S11: DC 24V control voltage
S21: Control line
13-14: Safety contact 1
23-24: Safety contact 2
Fig. 3 Connections
1