SAFETY RELAY SR ZERO A
4
8541408 - 17/05/2021 Rev.0
En
gli
sh
INSTALLATION AND ELECTRICAL CONNECTIONS
SR ZERO A is provided with terminal blocks for the electrical connections.
The unit provides 16 terminals.
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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.
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Wire size range: AWG 12...30, (solid/stranded) (UL).
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Use 60/75°C copper (Cu) conductor only.
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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.
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Cables used for connections longer than 50m must have a cross-section of at least 1mm2
(AWG16).
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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.
Figure 1