INSTALLATION AND ELECTRICAL CONNECTIONS
SR ZERO A is provided with terminal blocks for the electrical connections.
The unit provides 16 terminals.
➔Terminal tightening torque: 5...7lb-in (0,6...0,7 Nm).
Install SR ZERO A in an enclosure with a protection class of at least IP54.
Connect the safety relay module when it is not powered.
The supply voltage to the units must be 24 20% VDC; PELV (in compliance
with the standard EN 60204-1 (Chapter 6.4)).
Do not use the SR ZERO A to supply external devices.
The same ground connection (0VDC) must be used for all system components.
INSTRUCTIONS CONCERNING CONNECTION CABLES.
➔Wire size range: AWG 12...30, (solid/stranded) (UL).
➔Use 60/75°C copper (Cu) conductor only.
➔We recommend the use of separate power supplies for the safety relay and for other
electrical power equipment (electric motors, inverters, frequency converters) or other
sources of disturbance.
➔Cables used for connections longer than 50m must have a cross-section of at least 1mm2
(AWG16).
➔The path of the connection cables between the safety relay and the sensors, the connection
referring to the feedback contact must be different from that of other power cables.
