User Information
Safety Relay s from IDEM SCR-3
Safety Relay s from IDEM SCR-2H
H02
Ver. A
E61-328-00
•
Up to PL e, SILCL 3, category 4
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
•
Cyclical monitoring of the output contacts
•
Feedback loop for monitoring downstream contactors or
expansion modules
•
Short circuit and earth fault monitoring
•
Extrem compact housing
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.
Fig. 1 Block diagram SCR-2H
•
All relevant sefety regulations and standards are to be
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
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.
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
•
Installation and commissioning of the device must be
performed
only by authorized personnel
.
•
Observe the country-specific regulations when installing
the device.
•
The electrical connection of the device is only allowed to
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.
Fig. 2 Installation/removal
Electrical Connec-
tion
•
When the 24 V version is used, a safety transformer
according to EN 61558-2-6 or a power supply unit with
electrical isolation from the mains must be connected.
•
External fusing of the safety contacts (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
2
must not be excee-
ded.
•
The line cross section must not exceed 2.5 mm
2
.
•
If the device does not function after commissioning, it
must be returned to the manufacturer unopened. Ope-
ning the device will void the warranty.
13 23
14 24
K2
K1
SCR-2H
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
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,
•
the feedback loop is open (fault in the external contactor),
•
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.
(not for plug-in terminals)
SCR-2H
