S5-95F Installing and Connecting the Basic System
Fast-reacting actuators (e.g. quick-acting valves), may temporarily drop out during the test. If your
process does not tolerate this, you should select one of the following three options:
• Use actuators with a sufficient lag
• Call the DQ test at a non-critical system state
• Connect diodes and/or RC networks to the actuators
Using Actuators with Sufficient Lag
The following table shows a selection of tested coupling relays, which have a sufficient time delay
and which do not drop out during the DQ test.
Table 4-6. Permissible Actuators for Connection to the S5-95F
Manufacturer Type Rated Power of
the Solenoids
Rated Operational
Current
SIEMENS 3TF2010-0BB4 3 W at 24 V DC 3×9 A at 400 V AC
SIEMENS 3TH8031-0B 6.2 W at 24 V DC 4×10 A at 230 V AC
SIEMENS 3TH3022-0B 6.2 W at 24 V DC 4×10 A at 230 V AC
SIEMENS 3TH2022-0BB4 3 W at 24 V DC 4×4 A at 230 V AC
Telemecanique LP4-EC09 2.4 W at 24 V DC 4×6 A at 230 V AC
ABB KC22E 7 W at 24 V DC 4×4 A at 230 V AC
AEG SH04 1.2 W at 24 V DC 4×6 A at 440 V AC
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Calling the DQ Test Only in the User Program
Since the outputs are briefly disabled during the DQ test (see section 4.3), it is possible that fast-
reacting actuators drop out unintentionally during operation.You should therefore
not
have the DQ
test carried out
automatically by the S5-95F
(background test), but at defined, uncritical system
states via the FB525 (see section 9.2.6).
Connecting Diodes and/or RC Networks to the Actuators
Connection of diodes and/or RC networks results in the actuators being released with a time delay.
Dimensioning of the components required depends on the actuator used. If you have special
questions, please contact your local Siemens representative.
EWA 4NEB 812 6210-02
4-17
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