3
Translation of the original instructions
BA000589 - 05/2010 (Rev. A)
SNO 2004K
Basic device for Emergency-Stop Applications
•
Basic unit according EN 60204-1:2005 and EN ISO 13849-1:2007
•
PL d / category 3 in accordance with EN ISO 13849-1:2007 (previously EN 954:1997 cate-
gory 3)
•
SILCL 2 in accordance with EN 62061:2005
•
Feedback circuit for monitoring external relays/contactors
•
One or two-channel emergency stop is possible
•
Stop category 0
•
2 NO safety contacts
Front View
SUPPLY
K1, K2
LED green status of power supply
LED green operating state relay K1, K2
Safety Instructions
Only trained professional electricians may in-
stall, startup, modify, and retrofit this equip-
ment! 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 authorities 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 ma-
nipulation will void the warranty.
Caution!
If the device has been subjected to improper or
incorrect use it must no longer be used, and the
guarantee loses its validity. Impermissible con-
ditions include:
strong mechanical stress, for example through a
fall, or voltages, currents, temperatures or hu-
midity 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 equip-
ment / 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 components
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 ac-
cording to EN 60529.
Housing/terminals: IP 40/ IP 20.
Finger-proof acc. to EN 50274.
Device and Function Description
The 24 V supply is connected via the normally closed E-Stop button to terminal A1, and the supply
return or common to A2. Relays K1 and K2 are energised when the reset button Y1-Y2 is operated.
Both relays are latched by their own maintain contacts. Contacts on K1 and K2 also inhibit the
reset circuit after about 20 ms. Following the switch-on sequence, the two safety output contacts
(13 -- 14, 23 -- 24) close. Supply voltage and the status of relays K1 and K2 are indicated by two
LEDs.
If the E-Stop button is pressed, the supply to relays K1 and K2 is interrupted, and the safety con-
tacts open.
Proper Use
The device is used for monitoring control units in emergency stop devices.
Emergency stop devices are part of safety-related equipment on machines to protect from injuries
and damage to materials and machines.
The device switches the enabling paths off at interruptions > t
R
.
At an operation below the minimum operating voltage ( < 0,85 * U
N
) it can come to switching the
enabling current paths off.
Behavior in the disturbance
•
Locking:
If it should come to a locking of the device (e.g. brief power failure), the locked device can be
suspended by opening and closing the protective installation.
•
Short-circuits:
With occurrence of short-circuits on the control lines the electronic fuse responds. The device
is again ready for use after removal of the short-circuit and after a short recovery time of the
fuse.
•
Malfunctions of the contacts:
An activation is not possible with welded contacts.
Notes
•
The E - Stop circuit must be closed before operating the RESET key.
•
The Performance Level (PL) and safety category in accordance with EN ISO 13849-1 depends on the
external wiring, the application case, the choice of control station and how this is physically ar-
ranged on the machine.
•
The user must carry out a risk assessment in accordance with ISO 14121-1.
•
The entire system/machine must undergo validation in accordance with the applicable standards on
the basis of this.
•
In order for the specified Performance Level (PL) to be achieved, an average annual number of
switching cycles must not be exceeded (see EN ISO 13849-1, C.2.4 and Tab. K.1), taking into ac-
count the prevailing device load (see EN ISO 13849-1, Tab. C.1) and the application case. Assuming
that the
B
10d
value for the maximum load is 400,000, this results in a maximum cycle number of
400,000 / 0.1 x 30 = 133,333 switching cycles/year.
•
Insulation on external wiring should not be cut back more than 8 mm.
•
To multiply the enabling current paths, the expansion units or external contactive elements
with positively driven contacts can be used
.
•
External fuse protection for the relay and the contacts should not exceed 4 A type gG
.
•
The automatic restart (according EN 60204-1 section 9.2.5.4.2 and 10.8.3) has to be avoided
by the control system of overriding importance.
Please observe instructions from safety authorities.
