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Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 13 Function block faults 05.02.2007
13.3 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 acknowl-
edged. After pressing the button, the button re-
mains lit until the fault is rectified
• There was a temporary fault which, at the moment,
can no longer be detected, demanding an acknowl-
edgement 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
13.10 “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.
13.4 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 oper-
ated in parallel.
Main menu > Commissioning > Extra configuration > Faults > Inputs >
Operating line Adjustable values / display / remarks
Fault button external --- / RMH760.X4 etc. (digital only)
13.5 Fault properties
Faults are distinguished by properties. There are faults with regard to:
• Acknowledgement and reset
• Signal priority
• Plant behavior
13.5.1 Acknowledgement and reset
No acknowledgement is required for simple faults.
Fault relay
Note
cknowledgement of
faults
Resetting the fault relay
Configuration
Simple fault
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