Maintenance run

For motor-driven dampers, the user can perform a cyclical maintenance or test run. The test run can be triggered from a push button or an external time schedule pulse, the input reacts to the falling edge. We recommend to have one single maintenance switch per group. However, several switches are possible e.g. one per macro. To avoid damages, the maintenance run can happen only during the air handling unit is off ("PlantMode" = 0)

If somebody activates the maintenance button during a plant mode different of "0" this command will be ignored.  


The maintenance run is triggered on the falling edge of the input "MaintenanceRun". This way you can cascade any number of motorized dampers and these dampers will execute their maintenance run one after the other. To cascade the dampers you have to connect the output "MaintRunStatus" to the input "MaintenanceRun" of the following dampers,

If you want that all the dampers execute their maintenance run at the same time, you have to connect all the inputs"MaintenanceRun" to the maintenance switch or time schedule.


During maintenance run the "DamperCmd" output will be un-powered and the dampers runs to its fire position for the time defined in the parameter  “runtime to fire position”.

The next table defines the maintenance alarm behavior depending on the damper end switches:

End switch normal position

End switch fire position

Dampers command and alarm generation

-

-

The macro will not generate maintenance alarms.

1

-

The end switch "normal position" has to close within the time defined in parameter “runtime to fire position" and has to open again within the “runtime to normal position”. Otherwise, the macro generates a maintenance alarm.

-

1

The end switch "fire position" has to open within the “runtime to fire position” and has to close again within the “runtime to normal position”. Otherwise, the maintenance run failed and the macro generates a maintenance alarm.

1

1

The end switch "normal position" has to close within the time defined in parameter “runtime to fire position" and has to open again within the “runtime to normal position”.

The end switch "fire position" has to open within the “runtime to fire position” and has to close again within the “runtime to normal position”.


Otherwise, the maintenance run failed and the segment generates a maintenance alarm.


The output "MaintRunStatus" shows when a maintenance run is active.


The output "MaintRunFailed" shows a maintenance alarm, when the maintenance run failed. There is no automatic reset of the maintenance alarm. You have to configure a reset button input.


You can find the date and time of the last maintenance run in four display parameters.


Description

Default value

DISP-01: month of maintenance run

-

DISP-02: day of maintenance run

-

DISP-03: hour of maintenance run

-

DISP-04: minute of maintenance run

-