Safety
Installation Manual PSSuniversal
21262-EN-07
8
Overvoltage and interference spikes can damage the PSSuniversal. You should therefore
ensure that appropriate EMC measures are taken.
To achieve the lowest possible residual ripple (< ± 1.2 V), we recommend that you install a
three-phase bridge rectifier or regulated supply.
Protect the external power supply by fitting a fuse between the external power supply and
the controller. The size of the fuse will depend on the specification of the external power
supply, the cable cross section and on local regulations.
WARNING!
Risk of electrocution!
Safe electrical isolation must be ensured for the external power supply that
generates the supply voltage. Power supplies must conform to EN 60950,
03/97, section 2.3, EN 60742, 9/95 and EN 50178, 10/97.
Connect together the 0V connections on all the 24 V power supplies and earth the 0 V
mains at a single point, or ensure that measures are in place to monitor for earth faults.
The connection of the 0 V supply to the central earth bar or earth fault monitor must be in
accordance with national regulations (such as EN 60204-1, NFPA 79:17-7, NEC: Article
250, for example).
WARNING!
Risk of electrocution!
If voltages higher than 50 VAC or 120 VDC are connected to the PSSuni-
versal, e.g. to switch contacts on relay modules, please note the following:
– Specific accident prevention regulations apply.
– For safety reasons, only the protective earth (PE) may be connected
to the C-rail of the supply group.
2.3.2
Installation
Please note:
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Install the PSSuniversal in a protected environment, e.g. in a control cabinet or a pro-
tected interior compartment.
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Comply with the protection class required for the installation environment.
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Refer to the technical details of the relevant modules during installation.
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Ensure there is sufficient ventilation to prevent heat building up. Monitor the ambient
temperature to ensure it complies with the values stated in the modules' technical data.
