Supply Voltage; Insulation Voltage Test - Pilz 20 748-03 Operating Manual

Supply voltage

For details of the power supply please refer to the "Technical details" section.
Remember to take into account that the power supply experiences a brief inrush
current (ca. 2 A above current consumption) due to input capacitance.
CAUTION!
• The tolerance on the supply voltage is +25 % or -3 % maximum. Safe operation
cannot be guaranteed outside this range.
• The supply voltage at the field devices must not drop below 20.4 V, otherwise
safe operation cannot be guaranteed.
• Overvoltage or interference voltage can damage or even destroy the electronics
on the device. If this occurs, the affected I/O-Groups will switch to a STOP
condition and all the outputs in the affected I/O-Groups will be switched off. You
should therefore take note of the relevant EMC measures.
• The supply voltage to a sub branch can take a max. 3 A load.
WARNING!
Safe electrical isolation must be ensured for the external 24 V supplies. Failure to
do so could result in electric shock. Power supplies must conform to EN 60742,
9/95 (DIN VDE 0551) or EN 50178, 10/97.
To achieve the lowest possible residual ripple, we recommend that you install a
three-phase bridge rectifier or regulated supply.

Insulation voltage test

Pilz bus subscribers are connected to functional earth
on the voltage supply.
Insulation voltage tests are only possible with voltages up to ca. 42 V.
Operating Manual: PSS SB ACTIVE JUNCTION BASIS
via protection elements
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