Electrical Connection; Terminal Assignments - Leuze electronic MSI-SR4B Manual

7

Electrical connection

DANGER
Risk of death by electric shock!
Depending on external wiring, dangerous voltages may be present at the switching outputs.
 During all work at the electrical system or electronics, make certain that each voltage supply has been
interrupted and protected against being restarted.
The following must be observed for the current supply of the safety relay:
• Supply voltage 24 V DC ±20 %.
• Safe mains separation acc. to EN/IEC 60742 possible.
• A corresponding power supply unit handles interruptions of the supply voltage up to 10 ms in dura-
tion acc. to EN/IEC 61496-1.
WARNING
Improper electrical connection may result in serious injury!
 Only allow competent persons to perform the electrical connection.
 Make certain that supply and signal lines are laid separately from power lines.
 Use appropriate spark extinction for contactors in the cabinet.
 Observe the installation notices and operating instructions of the products that are to be connected via
the safety relay (drive motors, brakes, etc.).
The following conditions apply for the electrical connection:
• The safety relay is to be integrated in the control acc. to ISO 13849-1.
• No safety-relevant signals are switched via the message outputs.
• There are always two switching contacts integrated in the system switch-off circuit.
• Relay switching contacts are fused/protected externally according to their specifications (see
table 13.2).
Connecting the signal lines
For reliable and touch-safe contacts, isolate the connection ends as follows:
• Screw terminals: 7 mm
• Spring-cage terminals: 8 mm
7.1

Terminal assignments

WARNING
Selecting the wrong functions may result in serious accidents!
 Always connect safety sensors to an external safety relay and activate the restart interlock.
 For access guarding, make certain that the restart interlock cannot be unlocked from within the danger
zone but that the danger zone can be viewed from the acknowledgment button (Reset).
 Select the functions so that the safety relay is used as intended (see chapter 2.1 „Approved purpose
and foreseeable improper operation").
Connected to the safety relay are 16 numbered terminals to which the cables for the various functions are
connected.
Leuze electronic
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MSI-SR4B
Electrical connection
13