Alarm Acknowledgement; Delete Fault Status Messages - Siemens RMB795B Basic Documentation

No acknowledgement
required
Acknowledge
Acknowledgement and
reset
Note
Function
Notes
132 / 144
Siemens
Building Technologies

17.2.2 Alarm acknowledgement

This instruction applies to all fault status messages that require neither
acknowledgement nor resetting.
Example:
If there is no signal for the outside temperature, a fault status message will be
delivered. If the signal for the outside temperature returns, the fault status message
disappears automatically and the plant will resume normal operation.
This instruction applies to fault status messages that only require
acknowledgement.
An external solution is required for alarm latching and resetting.
Warning
When the fault status message disappears (external reset), the plant will return to
normal operation, even if the fault status message has not been acknowledged.
Example:
The plant incorporates an alarm for smoke extraction which must be locally reset.
The only purpose of the alarm indication is to make sure that the service staff take
note of the alarm.
This instruction applies to all fault status messages that must be acknowledged
and reset.
The alarm remains after you have acknowledged it, until the fault signal is no
longer present. Only then can you reset the alarm. After resetting, the LED in the
fault button extinguishes.
Example:
A fire alarm off must be acknowledged and reset.
To prevent regeneration of the fault message each time the plant is started, the
message is merely acknowledged. The fault status message shall be reset only
after the fire alarm has disappeared.
Fault status messages of other devices cannot be acknowledged on the RMB795B
central control unit.

17.2.3 Delete fault status messages

The operator unit allows for deleting the fault history list at the service level via
operating line "Delete faults":
Main menu > Faults >
Operating line
Delete faults
When activating this function, all other fault status messages will be reset also.
Only the pending faults continue to be displayed.
If the kind of acknowledgement with a pending fault is changed, it can happen that
the fault status message can neither be acknowledged nor reset.
You can also use this function to reset these fault messages!
Central control unit RMB795B
Help in case of faults
Comments
All current faults are reset internally, the "Faulty history"
list is deleted.
CE1P3122en
18.01.2012