UAD154A 3BHE026866R0101 Control card

The relevant LED (A1, A2, A3, Fault, Inhibit) will illuminate on the control card with the alarm condition as described in section 2.3. When relays are used for signalling update alarms, no other alarms or messages must be allocated to them. Configuration of update messages for “inhibit” should be avoided. l. Rising Alarm A rising alarm is caused by a rising level of the parameter being measured crossing a preconfigured threshold and will also cause the associated alarm LED to illuminate Falling Alarm A falling alarm is caused by a falling level of the parameter being measured crossing a preconfigured threshold and will also cause the associated alarm LED to illuminate. n. Latched Alarm A latched alarm is an alarm that will remain active even though the level monitored no longer crosses the alarm threshold. The alarm LED will remain lit until the alarm reset is operated.

Non-latched Alarm 

A non-latched alarm is an alarm that only remains active while the level being monitored crosses the alarm threshold. The alarm LED will remain lit while the alarm level remains but will automatically be reset when the level monitored no longer crosses the alarm threshold. p. Normally Energised A normally energised relay is activated when the power is removed from it, (eg. in the event of a system power failure). The LEDs will illuminate when an alarm or fault condition occurs irrespective of the relay configured state. q. Normally De-energised A normally de-energised relay is activated when the power is applied to it, (eg. in the event of an alarm condition). The LEDs will illuminate when an alarm or fault condition occurs irrespective of the relay configured state.

Time Delay Alarms (Version 2Vx Software only) 

The operation in response to alarm events of certain relays may be modified by applying a delay function to the relays. Time delay functions are available to delay the activation of a relay for a short period after an alarm event occurs and/or to maintain relay activation for a period after the alarm event has cleared. The time delay facilities are available for relays RL2 to RL8 of the High Integrity Relay Card only. The time delay function is useful to prevent spurious alarms and to ensure appropriate minimum operating times for external electrical apparatus connected to the relay

Control Card Versions

 Since the original launch of System 57 several new features have been added to enhance the capabilities of the 5701 Control Card. The key features for each software version are illustrated in the following table. Note that the software fitted to existing cards cannot be upgraded, however all versions of software and hardware are fully backward compatible so new cards can be incorporated into existing systems without difficulty

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