Additional Information On The Power Supply; Disturbances In The Supply Voltage - WAGO 750 Manual

50 Connect Devices
6.2

Additional Information on the Power Supply

Consider power layout of the WAGO I/O System 750
In addition to these operating instructions, you will also need the manual for the
used fieldbus coupler or controller, which can be downloaded at www.wago.com.
There, you can obtain important information including information on electrical
isolation, system power and supply specifications.
Avoid surges
F I/O modules must only be powered by a voltage that does not contain surges
(burst and surge) per IEC 61326-3-1 and IEC 61000-6-7. It may be necessary to
install an external field supply filter or filter module.
You can use modules 750-624, 750-626, 750-626/020-000 and 750-626/020-002
for filtering.
Modules 750-626/020-000 and 750-626/020-002 are particularly suitable for
systems monitored for ground faults (e.g., maritime applications).
Note that the cable length from the filter to the fieldbus node must be as short as
possible.
6.2.1

Disturbances in the Supply Voltage

Voltage dips may occur when very high capacitive loads are switched. If the
supply voltage falls below the permissible value, this can lead to passivation of
the F I/O module. To prevent unwanted passivation, low-impedance supply lines
and sufficient power supply units must be used. Alternatively in addition, a
capacitor can be used to support the field supply voltage for the digital inputs. For
the WAGO I/O System, a capacitive buffer module (e.g., Item No. 787-880) can
be used to bridge short duration voltage drops or load fluctuations in the field
supply voltage.
Manual
Version 1.0.0, valid from HW/SW Version 01/01
WAGO I/O System 750
753-661/000-004 4FDI 24V PROFIsafe