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WarnIng
risk of injury and material damage due to electrical faults.
If the EVS connections are not connected properly, there is a
risk of injury due to the uncontrolled reaction of the system.
▶ When using several modules with "EVS", connect each EVS
connection with a separate potential-free contact. never
interconnect several contacts!
▶ Do not supply voltage to the EVS contacts (risk of damaging
the modules).
risk of injury due to sharp edges.
Sharp edges on the EVS connection or on the contacts of the
plug-in screw-type terminal may result in cut injuries.
▶ Wear suitable protective gloves.
EVS connection
Fig. 13: EVS connection
The abbreviation EVS stands for "External Valve Shutdown".
Electronic base modules with "EVS" have an additional two-pole
connection on the top. This connection can be used to interrupt
24
english
Type 8647
Connecting
the power supply of the valves to this module, e.g. to implement
functions such as "Central system off" or deactivate actuators
group by group.
An interruption on the EVS connection will immediately cause a
single-pole interruption of the common supply to all valves of the
module (see "Fig. 14").
Load voltage L+
Load voltage M
LED „PWR"
EVS connection
for external
potential-free
contact
Fig. 14: Schematic representation of a valve unit with EVS (External
Valve Shutdown)
For use, the EVS connection must be connected to a potential-
free contact (mechanical switch or relay), e.g. via a relay module
RQ... or F-RQ ... of SIMATIC ET 200SP / SP HA.
Backplane bus
Voltage conversion,
control logic, and LCD
Valve driver, diagnostics
Valves
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