Electrical connection
Leuze electronic
MSI-SR5B
16
7
Electrical connection
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.
The following conditions apply for the electrical connection:
• Integration of the safety relay in the control circuit acc. to EN ISO 13849-1.
• Lay the supply voltage cables separately acc. to EN ISO 13849-1.
• Shutdown of the supply voltage for operational purposes is to be made impossible.
• If the simultaneous switching of two single-channel, contact-controlled sensors is planned, these
must be connected at one terminal group.
• If non-simultaneous switching of two single-channel, contact-controlled sensors is planned, these
are to be connected separately at two terminal groups and the lines to the S inputs of the safety relay
are to be laid in a protected manner.
• Connections 29, 30, 31 and 32 are equipped with reinforced isolation with respect to the housing and
the other connections. The mixed connection of protective extra low voltage and low voltage (e.g.,
240 V~) at terminals 29, 30, 31 and 32 is not permissible.
• It is not permissible to connect the sensor lines in parallel with third-party components.
• All available safety inputs must be occupied.
• To prevent welding of the output contacts, an external fuse must be connected upstream according
to the technical specifications (see table 13.2).
• Terminals 14 and 22 are not intended for the operation of external devices, but rather only for the
supply of potential-free contacts.
• When connecting potential-free contacts at inputs S (21, 13, 23, 15) of the safety relay, a safety fuse
is to be interposed acc. to DIN EN 50156-1.
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
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.
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 and operating information for the products that are to be evaluated via the
safety relay (e.g., multiple light beam safety devices, safety switches, etc.).
Observe the installation and operating information for the products that are to be connected via the
safety relay (e.g., drive motors, brakes, etc.).
When using contact-controlled sensors, separately laid supply lines are to be used for sensor 1 (+S11,
+S12, -S12) and sensor 2 (+S21, +S22, -S22). Cross circuit monitoring exists within the terminal
groups, but not between the groups.
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