Test of the monitoring function
7.2.
Automated functional tests (at the frequency intervals specified in DIN EN 61508 or promptly after the request)
are to be performed using the DC (Diagnostic coverage) on the monitoring circuit, taking into account the re-
quest rate of the safety function.
The two sub-systems, the warning light channel and the monitoring circuit have separate power supply connec-
tions. This means that a check of the function is possible and can be carried out as follows (time dependencies
see Illustration 5 – Reaction time of the fault indicator relay):
1.) Function test if the monitoring circuit is drawing steadily on the operating voltage (ready mode)
a) check whether the fault indicator relay is de-energized when the warning light is switched off (no warn-
ing signal is produced)
b) after switching on the operational voltage to the warning light, the fault indicator relay must energize af-
ter a maximum of 2.5 s
c) Switching off the operational voltage of the warning light, the fault alarm relay must trip after 2 s at the
latest
2.) Function test if this occurs during switch on of the power supply to the monitoring circuit
a) Before switching on the monitoring circuit, check whether the fault indicator relay is deactivated
b) Switch-on of operating voltage to the monitoring circuit when warning light is not switched on, the fault
indicator relay is energized for max. 2.5 s
c) Check whether the fault indicator relay trips correctly thereafter
d) After switching on the operational voltage to the warning light, the fault indicator relay must have ener-
gized after a maximum of 2.5 s
e) After switching off the operational voltage of the warning light, the fault alarm relay must trip after 2 s at
the latest
f) Switching off the flashing monitor
The test is intended to ensure that the relay contacts switch to reflect whether the flashing light generation is
detected.
8. Process safety time
Conclusions as to whether the process stability times are met can be derived from the function time diagram
(Illustration 5 – Reaction time of the fault indicator relay). The reaction times for the generation of the optical
warning signal and/or the switching status of the fault indicator relay based on the switch-on time of the opera-
tional voltage are illustrated here.
The warning light produces a signal within 1 s of the application of operating voltage.
The fault indicator relay activates within 2.5 s
9. Hardware configuration
n/a
Configuration for selection of operating modes see chapter 13.4.
10. Limits of use
Optical warning for humans inherently demand active participation by the persons involved, as the reactions
require intentional action by one or more persons. The establishment of a safe status thus has limits and ulti-
mately requires additional measures.
11. Installation
Safety note
11.1.
Handling according to this operating manual may only be carried out by trained electrical technical personnel
authorized by the plant operator. The operating instruction and the information contained within must be imple-
mented and be made generally available to the technical personnel.
The electrical connection can only be carried out by persons authorized for this. Before connecting it is to be
ensured that the warning light is not live.
The safety instructions of this operating manual, the local installation standards as well as the valid safety regu-
lations and accident prevention guidelines are to be observed.
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