Basic Documentation

209/256
Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 14 Function block faults 2017-09-29
14.3 Fault button
Fault status messages delivered to the controller are indicated by the LED in the fault
button. If a fault status message needs to be acknowledged, the acknowledgement
must also be made via the fault button.
There are 3 choices:
Indication
Cause / procedure
Button dark
No fault present
Button flashes • There is a fault which has not yet been
acknowledged. After pressing the button, the button
remains lit until the fault is rectified
• There was a temporary fault which, at the moment,
can no longer be detected, demanding an
acknowledgement which has not yet been made.
After pressing the button, flashing stops
Button lit
There is a fault which has already been acknowledged
A fault relay, if present, remains energized as long as the button flashes. For more
detailed information, refer to section 14.10 " Fault relay".
The LED extinguishes only when the fault is no longer present. If the LED of the fault
button is lit and does not extinguish when making acknowledgements, a fault status
message is still pending.
The acknowledgement is to be made as follows:
• Acknowledge the fault relay (only, if a fault relay has been configured)
• Acknowledge all fault status messages pending at the controller
• Fault status messages with self-holding can only be reset when the fault is no longer
present
Faults can only be acknowledged on the controller where the fault is pending.
Fault relays can only be reset on the controller with the configured fault relays.
14.4 External fault button
The fault block has a connection facility for an external fault button. The external fault
button has the same function as fault button
on the unit. The 2 buttons can be
operated in parallel.
Main menu > Commissioning > Extra configuration > Faults > Inputs >
Operating line
Adjustable values / display / remarks
Fault button external
--- / RMH760.X4 etc. (digital only)
14.5 Fault properties
Faults are distinguished by properties. There are faults with regard to:
• Acknowledgement and reset
• Signal priority
• Plant behavior
Fault relay
Note
Acknowledgement of
faults
Resetting the fault relay
Configuration