!
!The Restart command must be installed outside the danger area in a position where the danger
area and the entire work area concerned are clearly visible.
!It must not be possible to reach the control from inside the danger area.
2.2.2 K1K2 FEEDBACK input
Using the K1 and K2 auxiliary safety contactors with guided contact safety type, it is necessary to
connect the +24 Vdc to the K1K2 FEEDBACK through the series of the K1-1 e K2-1 N.C. control
contacts. The control of the correct switching of K1 and K2 is performed with a delay of 300 ms
after the real command. When the K1-1 e K2-1 N.C. control contacts are not used (or no control is
provided) it is mandatory to connect the terminal 11 (K1K2 FEEDBACK) to the +24 Vdc.
2.2.3 SYSTEM STATUS output
The SYSTEM STATUS output reports exactly the output safety relays status :
•When the output relays are opened, the SYSTEM STATUS reports 0 Vdc.
•When the output relays are closed, the SYSTEM STATUS reports +24 Vdc.
2.3 INSTALLATION AND ELECTRICAL CONNECTIONS
!Install the SB400 control unit in an environment with a protection rating of at least IP54.
!If more modules SB400 must be installed in the same board panel, in order to avoid overheating,
maintain between them one minimal distance of 2 cm.
!The SB400 control unit must be supplied with a 24 Vdc ±20%.
!The external power supply must comply with the standard EN 60204-1.
!During the installation of the SB400 control unit be sure to avoid short circuits between the
contacts 7 and 8.
2.3.1 Characteristics of the output circuit.
For the output circuit, the control unit uses two guided contact safety relays.
These relays are rated by the manufacturer for voltage and current values above those indicated
in the technical data; however, to assure correct insulation and to avoid damage or premature
aging, protect each output line with a 4 A slow-blow fuse and check that load characteristics
comply with the indications given in the table below.
