Supply Voltage; General Requirements - Pilz PSS Series Operating Manual

Supply Voltage

General requirements

Please note the following:
• When selecting the power supply, please refer to the requirements stated
under "Technical Details".
INFORMATION
When test pulse outputs are used, the output circuits are designed to
guarantee maximum safety. To achieve this, extensive tests are carried
out internally. If the supply voltage is interrupted during a test function,
the relevant test pulse output will be deemed to be defective.
The normal error reaction will occur: the PSS switches to a STOP
condition.
Remedy: buffer the PSS supply voltage.
• Overvoltage and spikes of interference outside the specifications can
damage the PSS. In this case the PSS will switch to a safe condition.
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.
• The fuse between an external power supply and the PSS protects the
external supply. The size of the fuse will depend on the specification of
the external power supply, the cable cross section and on local
regulations.
WARNING!
Electric shock!
Safe electrical isolation must be ensured for the external 24 V supply.
Failure to do so could result in electric shock. Power supplies must conform
to EN 60950, 03/97, section 2.3, EN 60742, 9/95 or EN 50178, 10/97.
Operating Manual: PSS SB 3006-3 Series
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