Unit installation
Smart Relay: SREL, SREL.ZK, SREL.ADV 
Page 6 
3.4  Determine the Installation Position 
The range from the transponder to the Smart Relay (reader range) is a maximum of 
1.5 m (5 feet), but can be dampened by a metal environment (particularly by strong 
magnetic fields or aluminium).   
Ideally, you should conduct a range test with an authorised transponder and a 
battery-operated Smart Relay.   
3.5 Additional Information: 
-  All cables for connecting to the Smart Relay should be type IY(ST)Y ....x0.6 
(Twisted-Pair shielded cable). The maximum cable length should not exceed 
100 m (approximately 330 feet). At the same time, you must take into account 
the power losses when you dimension the supply voltage.  
-  You must take into consideration the technical specifications for the inputs and 
outputs (see Technical Data)  
-  You must lay and connect all cables according to VDE standards. 
4.0 Before Installation 
  Unpack the Smart Relay and check for any damages. 
  Connect the Smart Relay to a supply voltage or battery. 
  If you are operating the Smart Relay with a power supply, insert the backup 
battery included in the delivery into the holder provided for it (see Installation 
of the Backup Battery). 
  Verify the function of the Smart Relay with a transponder in the condition as 
received from the factory. 
  If you are installing the Smart Relay in a flush socket device, remove the 
housing. 
  If you are installing the Smart Relay on the wall, you can use the bottom plate 
as a template for the bore holes (6 mm). 










