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IB IL 24 PSDO 8-PAC
PHOENIX CONTACT
7619_en_05
6.2
Notes on the protective circuit for external re-
lays/contactors (freewheeling circuit)
Figure 6-1
Example of the freewheeling circuit for an external relay
For all examples, please also observe the measures specified in the individual tables,
which must be taken to achieve the specified SIL/SILCL/Cat./PL and all measures accord-
ing to standards EN 61508, EN 62061, and EN ISO 13849-1 to achieve the specified
SIL/SILCL/Cat./PL.
WARNING: Disregarding this warning may lead to the loss of the safety function
An external voltage may not be supplied in an output (e.g., via cross-circuits). These er-
rors can adversely affect the operation of the module (or even destroy the module) and
therefore result in the loss of the safety function. Therefore, these errors must be prevent-
ed. Install the connecting cables for connecting the actuators so that they are protected
against cross-circuits.
Please observe the load capacity of the outputs according to the technical data in “Safe
–
Limit the voltage induced on circuit interruption to < -15 V (e.g., with RC elements,
suppressor diodes or varistors).
–
Please note that the freewheeling circuit affects the fall time and the service life of the
contactor.
–
Please observe the specifications of the relay manufacturer when sizing the relay pro-
tective circuit.
K 1
6 9 4 0 0 0 2 1
Содержание IB IL 24 PSDO 8-PAC
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