Leuze electronic GmbH + Co. KG
In der Braike 1 D-73277 Owen
We reserve the right to make changes
•
www.leuze.com
Tel. +49 (0) 7021 573-0
01/2018 - 50134621-01 - 4/23
MSI-SR-LC21DT03-xx, MSI-SR-LC21DT30-xx
Original operating instructions
Base Device for Emergency Stop and Safety Gate Applications
•
Basic device for controlled stop according to EN 60204-1 and
EN ISO 13849-1:2015
•
Immediately switching contacts: PL e, category 4, SILCL 3, stop category 0
•
Delayed contacts: PL d, category 3, SILCL 2, stop category 1
•
Usage according to 50156-1
•
Single or two-channel control with contacts or semiconductors
•
Cross monitoring, synchronous time monitoring
•
Reset button monitoring
•
3 enabling current paths (2 non delayed, 1 off-delayed)
Device style
MSI-SR-LC21DTxx-01
with screw-type terminals pluggable
MSI-SR-LC21DTxx-03
with spring-type terminals pluggable
Front View
SUPPLY LED green status of power supply
K1, K2 LED green operating state relay K1, K2
K3, K4 LED green operating state relay K3, K4
Safety Instructions
Only trained professional electricians may
install, startup, modify, and retrofit this
equipment! Disconnect the device/system
from all power sources prior to starting any
work! If installation or system errors occur,
line voltage may be present at the control
circuit in devices without DC isolation!
Observe all electrical safety regulations
issued by the appropriate technical authori-
ties or the trade association. The safety
function can be lost if the device is not
used for the intended purpose. Opening
the housing or any other manipulation will
void the warranty.
Caution!
If the device has been subjected to im-
proper or incorrect use it must no longer be
used, and the guarantee loses its validity.
Impermissible conditions include:
strong mechanical stress, for example
through a fall, or voltages, currents,
temperatures or humidity outside of the
specifications.
Before starting up your machine/plant for
the first time, please be sure to check all
the safety functions according to valid
regulations, and observe the specified
test cycles for safety equipment.
Caution!
Perform the following precautionary
steps prior to installation, assembly,
or disassembly:
1.
Disconnect supply voltage to the
equipment/system prior to starting
any work!
2.
Lockout/tag the equipment/system
to prevent accidental activation!
3.
Confirm that no voltage is present!
4.
Ground the phases and short to ground!
5.
Protect against adjacent live compo-
nents using guards and barriers!
6.
The devices must be installed in a
cabinet with a protection class of at least
IP 54.
Caution!
Limited contact protection! Protection
type according to EN 60529.
Housing/terminals: IP 40 / IP 20.
Finger-proof acc. to EN 50274.
Device and Function Description
With the supply voltage applied to terminals A1/A2 and the E-Stop circuit closed, the
control logic is activated by closing the contact of the RESET button. This last controls
the K1 to K4 relays that after the response time tA1 become self-locking. After this
switch-on phase the three safety paths at the output 13/14, 23/24 and 37/38 are closed.
Three LEDs display the status of the K1/K2, K3/K4 internal relays and the power supply.
If the E-Stop contact switch is opened the current leads for the K1 and K2 relays are
interrupted. The enabling current paths 13/14, 23/24 at the output are immediately
opened (after their release time t
R1
) and the off-delayed contact 37/38 stays closed dur-
ing the preset off-delay time t
R2
. The off-delay time can be adjusted.
With a two-channel connection of the E-Stop switch and cross monitoring wiring of the
E-Stop circuit, it is possible to monitor the presence of a short circuit between the con-
nected cables (cross monitoring) and ground faults. An internal electronic circuit protects
the device relay from damages. After eliminating the fault the item will return into opera-
tion after about 3 s.
RESET button monitoring
The device is equipped with the monitoring feature for the RESET key. The device can
be enabled with the falling edge (RESET released) or rising edge (RESET closed) of the
signal (terminals S34 or S35). For the specific use in the emergency stop applications
with manual START the RESET button must be connected to terminals S33/S34.
The device is enabled only with a falling edge of the RESET signal. In order to start the
RESET button has to be closed and released. For those applications with protective
gates where an automatic RESET must be performed, it is necessary to jumper termi-
nals S35 with S35. The device will react at the rising edge of the input signal at S12
which is internally connected to S33.
Synchronous check
The use of safety limit switches for single or dual channel circuit in the protective gate
application depends from the required safety level. The device features a dual channel
control and in addition a synchronous check of the limit switches on request. Precondi-
tion for a simultaneity check t
S
≈ 0.
5 s is the position of the limit switches. The limit
switches must be positioned so that channel 1 (terminals S11/S12) has to close before
channel 2 (terminals S21/S22) does. If channel 2 closes before channel 1 the synchro-
nous time t
S
=
∞
.
Please observe instructions from safety authorities!
