Electrical Installation; Requirements For Electrical Installation - Leuze electronic MSI 400 Operating Instructions Manual

7

Electrical installation

7.1

Requirements for electrical installation

This section describes the electrical installation of the MSI 400 system in the switchbox. You can find addi-
tional information on the electrical connection of other devices to the MSI 400 system in the section on the
respective device (see Product description [chapter 2.5.2]).
Safety information
Switch off power to the entire system/machine!
It is possible for the system to be unintentionally started while you are connecting the devices.
Note the corresponding safety standards!
All of the safety-related parts of the system (wiring, connected sensors and command encoders,
configuration, device monitoring) must meet the respective standards (e.g. EN 62061 or EN ISO
13 849-1). This can mean that the safety-related signals must be designed redundantly or that
single-channel signals must be routed in a protected manner, or that short-circuit detection will
be required through the use of test outputs and/or regular function tests.
Ä Note that short-circuit between test outputs and the corresponding input cannot be detected.
Ä Consider whether a shielded cable or separate line routing will be required for these signals.
Ä In the event of a short-circuit to 24 V at an output, it will no longer be possible to switch off
the output.
Ä Reverse current to a switched-off output of an MSI-EM-IO84 cannot be prevented and will
influence the ability to switch off the outputs.
Limited short-circuit detection in the input circuits
Ä One MSI 4xx has four test signal generators T1 – T4.
Ä One MSI-EM-I8 module has two test signal generators. One test signal generator is re-
sponsible for the odd-numbered test outputs (X1, X3, X5, and X7), while the other is re-
sponsible for the even-numbered test outputs (X2, X4, X6, and X8).
Ä Short-circuits between test signal generators of a MSI-EM-I8 or MSI-EM-IO84 module are
detected. Between different modules, the short circuit detection is then only ensured if the
test gaps of the test signal generators are < 4 ms, the test periods ≥ 200 ms and no more
than 9 modules (MSI-EM-I8 / MSI-EM-IO84) have been plugged in. Short-circuits after 24
V DC (after High) at inputs that are connected to test outputs are detected independently of
the length of the test gaps.
Ä Please ensure that the odd-numbered test outputs (X1, X3, X5, and X7) at an MSI-EM-I8
are connected to a common test signal generator and that the even-numbered test outputs
(X2, X4, X6, and X8) are connected to another common test signal generator. Therefore,
short-circuits between the odd-numbered test outputs (X1, X3, X5, and X7) cannot be detec-
ted. The same applies accordingly to the even-numbered test outputs X2, X4, X6, and X8.
Make note of this during wiring (e.g. through separate routing or protected lines)!
Reverse current at inputs of MSI 4xx, MSI-EM-IO84 or MSI-EM-I8 with breakdown of
ground!
In the event of an internal or external ground breakdown, reverse current can flow from the sup-
ply voltage of the COMPACT module (terminal A2) to the safe inputs of the MSI 4xx, MSI-EM-
IO84 or MSI-EM-I8 modules. Make note of this if other inputs are connected in parallel to these
inputs so that this reverse current does not lead to an unintentional high at the inputs connected
in parallel.
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MSI 400
Electrical installation
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