GELBAU 252.0 Z Series Original Operation Manual

General
The resistance evaluation unit 252.0xZ is a dual safety relay designed to monitor GELBAU Contact-Duo safety
switching strips with a resistance of 8.2 kΩ as an electrical termination. The 252.0xZ model series has a two-
channel configuration and incorporates a control which monitors redundancy. The stop output (13, 14) comprises
two force guided relays.
With an additional changeover contact (21, 22, 24), a notification contact or auxiliary contact is available.
The safety system complies with the EN ISO 13849-1: 2008 standard and the EN ISO 13856-2: 2013 European
standard for pressure-sensitive protective devices as it applies to output switchgear.
Arrangement, connection
14 24 21 22
a
4A
252.0xZ
b
A2 13 Z1
Function
The Contact-Duo switching strip connected to Z1, Z2 is monitored with a quiescent current. If correctly wired, the
safety contact 13, 14 is closed and both green LEDs are illuminated in the operating state "Ready".
If the Contact-Duo switching strip is actuated (compressed), both safety relays K1 and K2 assigned to it drop out
and safety contact 13, 14 is opened. The red LED is illuminated.
If the quiescent current circuit between Z1, Z2 is interrupted, the yellow LED lights up. Safety contact 13, 14 is
opened.
The additional changeover contact 21, 22, 24 switches simultaneously with the STOP contact and may not be
used in the safety circuit!
Function table
(status display)
Status of the switching strip
Properly connected;
non-actuated status
actuated (compressed)
Switching strip interrupted
14_252_0xZ
GELBAU GmbH & Co. KG
Original operation manual – Safety relay 252.0xZ
A1
8K2
Z2
Red LED
illuminated
phone: +49 2208 / 9455-0 FAX: 9455-99
Wiring diagram
F1
4A
K2
K3
K1
14
A1 A2 13 24 21 22
AC
+DC -
Yellow LED Green LED(2x)
illuminated
illuminated
www.gelbau.com
Z1 Z2
8k2
Output
13, 14
closed
open
open
12 March 2014
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