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Up to PL e, SILCL 3, category 4
Correct Use
The SR104P 2-hand safety relay is an extremely com-
pact, universal safety two-hand control unit. It
complies with EN574, Typ III C, and is intended for use
in safety circuits that are designed in accordance with
EN 60204-1, e.g. on presses, punches and bending
tools. Due to the internal error monitoring, the 2-hand
safety relay can be used, despite very compact dimen-
sions, for all applications up to the highest safety cate-
gory 4 and PL e according to EN ISO 13849-1, SILCL 3
according to EN 62061 or Typ III C according to EN 574.
Features
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2 safe, redundant relay outputs
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Cyclical monitoring of the output contacts
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Feedback loop for monitoring downstream contactors or
expansion modules
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Short circuit and earth fault monitoring
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Extrem compact housing
Function
The OMRON STI 2-hand safety relay SR104P is suitable
for setting up and monitoring two-hand circuits and is used
to protect the operators. Dangerous work steps can only be
triggered when both two-hand buttons connected are ope-
rated simultaneously, i.e. within 0.5s.
It is to be ensured a single fault or a malfunction does not
result in the loss of the safety function and every fault is
detected by the cyclic self-monitoring at the latest prior to
the next actuation.
When the operating voltage is applied to A1-A2 and the
feedback loop X1-X2 is closed, the SR104P is ready for
use. To be able to initiate a switching operation, the output
relays must be de-energized. The output relays only switch
to the energized position when the two-hand buttons T1
and T2 are operated simultaneously, i.e. within 0.5s.
Fig. 1 Block diagram SR104P
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It is not allowed to open the device, tamper with the device or
bypass the safety devices.
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All relevant sefety regulations and standards are to be observed.
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The overall concept for the control system in which the device
is integrated is to be validated.
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Failure to observe the safety regulations can result in death,
serious injury and serious damage.
Installation
As per DIN EN 60204-1, the device is intended for installa-
tion 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.
Safety Precauti-
ons
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Installation an setup are only allowed to be undertaken
by trained personell.
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The electrical connection is only allowed to be made with the
device and wiring isolated.
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The wiring must comply with the instructions in this user
information, otherwise there is a risk that the safety function
will be lost.
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As per EN 60204-1 the device is intended for installation in
control cabinets with a minimum degree of protection of IP54.
Fig. 2 Installation/removal
Electrical Connec-
tion
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When the 24V version is used, a control transformer
according to EN 61558-2-6 or a power supply unit with
electrical isolation from the mains must be connected.
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External fusing of the safety contacts (4A slow-blow or
6A quick-action or 10A gG) must be provided.
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A maximum length of the control lines of 1000 meters
with a line cross section of 0.75 mm
2
must not be excee-
ded.
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The line cross section must not exceed 2.5 mm
2
.
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If the device does not function after commissioning, it
must be returned to the manufacturer unopened. Ope-
ning the device will void the warranty.
Fig. 3 Connections
A1:
Power supply
A2.
Power supply
S11:
Control line T1
S12:
Control line T1
S13:
Control line T1
S21:
Control line T2
S22:
Control line T2
S23:
Control line T2
X1; X2: Feedback loop
13-14: Safety contact 1
23-24: Safety contact 2
(not dor plug-in terminals)
The output relays are not switched if:
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only one two-hand button is actuated or the time between the actuation of the 2 two-hand buttons is greater than 0.5s,
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the feedback loop is open (fault in the external contactor),
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another error (short circuit, cable break, error in the switching device) has occurred.
When T1 and/or T2 are/is released, the output relays opens immediately. In order to trigger a new operation, both two-hand
buttons must first be released and the feedback loop must be closed.
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Safety
SR104P
User Information for SR104P
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