IDEM SAFETY SWITCHES SCR-2H User Information

Safety Relays from IDEM Safety Relays from IDEM
User Information
Correct Use
The SCR-2H 2-hand safety relay is an extremely com-
pact, universal safety two-hand control unit. It com-
plies 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 dimensions,
for all applications up to the highest safety category 4
and PL e according to EN ISO 13849-1, SILCL 3 accord-
ing to EN 62061 or Typ III C according to EN 574.
Features
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
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expansion modules
Short circuit and earth fault monitoring
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Extrem compact housing
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Function
The IDEM 2-hand safety relay SCR-2H is suitable for set-
ting 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 0.5 s.
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 SCR-2H 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 0.5 s.
The output relays are not switched if:
only one two-hand button is actuated or the time between the actuation of the 2 two-hand buttons is greater than 0.5 s,
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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.
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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.
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.
Installation and commissioning of the device must be
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Safety Precauti-
performed only by authorized personnel.
ons
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.
It is not allowed to open the device, tamper with the
•
device or bypass the safety devices.
When the 24 V version is used, a safety transformer
Electrical Connec- •
according to EN 61558-2-6 or a power supply unit with
tion
electrical isolation from the mains must be connected.
External fusing of the safety contacts (10 A gG) must be
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provided.
A maximum length of the control lines of 1000 meters
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with a line cross section of 0.75 mm
ded.
The line cross section must not exceed 2.5 mm
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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.
Up to PL e, SILCL 3, category 4
•
Fig. 2 Installation/removal
All relevant sefety 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.
Note down the version of the product (see label "Ver. X")
•
and check it prior to every commissioning of a new de-
vice. If the version has changed, the overall concept of
the control system in which the device is incorporated
must be validated again by the user.
2
must not be excee-
2
.
SCR-2H SCR-3
SCR-2H
(not for plug-in terminals)
Fig. 1 Block diagram SCR-2H
A1: Power supply
A2. Power supply
S11: Control line T1
S12: Control line T1
SCR-2H
S13: Control line T1
13 23
K1
S21: Control line T2
K2
14 24
S22: Control line T2
S23: Control line T2
X1; X2: Feedback loop
13-14: Safety contact 1
23-24: Safety contact 2
Fig. 3 Connections
H02
Ver. A
E61-328-00