20
20
-0
4
16
Functional Safety KCD2-SCD-Ex1.ES(.SP), HiC2031ES
Operation
5
Operation
Operating the device
1.
Observe the safety instruction in the instruction manual.
2.
Observe the information in the manual.
3.
Use the device only with devices that are suitable for this safety application.
4.
Correct any occurring safe failures within 24 hours. Take measures to maintain the safety
function while the device is being repaired.
5.1
Proof Test
This section describes a possible proof test procedure. The user is not obliged to use
this proposal. The user may consider different concepts with an individual determination
of the respective effectiveness, e. g. concepts according to NA106:2018.
According to IEC/EN 61508-2 a recurring proof test shall be undertaken to reveal potential
dangerous failures that are not detected otherwise.
Check the function of the subsystem at periodic intervals depending on the applied PFD
avg
in accordance with the characteristic safety values provided. See chapter 3.4.
It is under the responsibility of the plant operator to define the type of proof test and the interval
time period.
With the following instructions a proof test can be performed which will reveal all of the possible
dangerous faults (diagnostic coverage 99 %).
Equipment required:
•
Digital multimeter with an accuracy better than 0.1 %
Use for the proof test of the intrinsic safety side of the device a special digital multimeter
for intrinsically safe circuits.
Intrinsically safe circuits that were operated with non-intrinsically safe circuits may
not be used as intrinsically safe circuits afterwards.
•
Power supply set to nominal voltage of 24 V DC
•
Process calibrator with current source function with an accuracy better than 20
µ
A
•
Load resistor (
±
10 %, > 0.5 W), see table
Danger!
Danger to life from missing safety function
If the safety loop is put out of service, the safety function is no longer guaranteed.
•
Do not deactivate the device.
•
Do not bypass the safety function.
•
Do not repair, modify, or manipulate the device.
