kcd2-sr--ex- Pepperl+Fuchs, kcd2-sr--ex- Datasheet - Page 11

• Manufacturer Part Number: kcd2-sr--ex-
• Description: Process Automation
• Manufacturer: Pepperl+Fuchs

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4.1
4.2
SAFETY MANUAL SIL KCD2-SR-(EX)*.(LB), HIC282*
Proof Test
Proof Test
Characteristic Safety Values
For the characteristic safety values like PFD/PFH, SFF, HFT and T
SIL report/FMEDA report. Please note, PFD and T
The function of the devices has to be checked within the proof test interval (T
Proof Test Procedure
According to IEC 61508-2 a recurring proof test shall be undertaken to reveal potential
dangerous fails that are otherwise not detected by diagnostic test.
The functionality of the subsystem must be verified at periodic intervals depending on the
applied PFD
webpage www.pepperl-fuchs.com.
It is under the responsibility of the operator to define the type of proof test and the interval time
period.
The ancillary equipment required:
•
•
The settings have to be verified after the configuration by means of suitable tests.
Procedure:
Sensor state must be simulated by a potentiometer of 4.7 kΩ (threshold for normal operation),
by a resistor of 220 Ω (short circuit detection) and by a resistor of 150 kΩ (lead breakage
detection).
The input test needs to be done for each input channel individually. The threshold must be
between 1.4 mA and 1.9 mA, the hysteresis must be between 170 µA and 250 µA.
•
•
If the resistor R
detect an external error. The red LED shall be flashing and the relay of the corresponding
channel shall de-activate.
Both relay outputs need to be tested with a certain current, i. e. 100 mA. To avoid any electrical
shock problems, we recommend to use 24 V DC for this test. For the philosophy of Functional
Safety it is important to test, that the relay contacts are definitely open, if the relay is de-
activated.
Digital multimeter with an accuracy better than 0.1 %
For the proof test of the intrinsic safety side of the devices, a special digital multimeter for
intrinsic safety circuits must be used. Intrinsic safety circuits that were operated with
circuits of other types of protection may not be used as intrinsically safe circuits afterwards.
Power supply set at nominal voltage of 24 V DC
For normal mode of operation the relay must be activated (yellow LED on), if the input
current is above the threshold.
For inverse mode of operation the relay must be activated (yellow LED on), if the input
current is below the threshold.
avg
SC
in accordance with the data provided in the safety certificate available on our
(220 Ω) or the resistor R
LK
(150 kΩ) is connected to the input, the unit must
proof
are related to each other.
proof
please refer to the
proof
).
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