7. Operating behavior of the monitoring equipment
The required guidance and control system must be capable of carrying out a fault analysis based on the fault
reporting output in connection with the operational state of the flashing light and the monitoring circuit. The fol-
lowing dependencies between operational condition and capacity of failure are therefore possible. Please also
take note of the possible switching status as shown in Illustration 5 – Reaction time of the fault indicator relay.
a) When in a fault-free condition, switching on the power supply of the warning light channel while there is
simultaneous supply to the monitoring circuit results in a switch of the relay contacts S1 and S2. If the
switch does not take place, then a fault has occurred in the warning light, in the monitoring circuit or in
the connection lines, see also the time dependencies in Illustration 5 – Reaction time of the fault indica-
tor relay. This also affects switching off the power supply of the warning light and the monitoring circuit.
b) Should, during the operating phase of the light, it become the case that the optical warning signals stay
off, then the fault indicator relay is triggered within 2.5 seconds.
c) Please note! When activating the monitoring equipment before the activation of the warning light, the
fault indicator relay immediately energizes and is tripped after a maximum of 2.5s, and the monitoring
circuit is ready mode. The deployed warning signal occurs after no more than 2.5 seconds based on the
relay contacts. If the lights are activated within 1 second of switch-on of the supply voltage to the moni-
toring circuit and the warning signal is generated, then the fault indicator relay does not trip and the
monitoring circuit does not go into ready mode.
d) Broken cables or short circuits at failure reporting outputs can be detected by a higher-level control sys-
tem thanks to the separate positively driven NC and NO relay contacts.
e) When switching off the optical warning signal, the control system should detect the deactivation of the
fault indicator relay within 2 s. This allows for early detection of sticky relay contacts.
Time dependencies and switch states
7.1.
Operational voltage
Optical warning system
Optical warning system
Operational voltage
Monitoring circuit
Fault indicator relay
Monitoring circuit
Fault,
optical warning system
Illustration 5 – Reaction time of the fault indicator relay
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