Fan alarms
This module provides three status alarm outputs.
Depending on status alarm configuration ALM-07, the macro generates different types of alarms, as shown in the next tables. When the alarm conditions are true, the alarms will occur after a delay defined by the value of parameter ALM-05.
If the parameter ALM-03 = 1, and an alarm is generated, the output "FanCmd" will stay:
Output |
Status |
Alarm (ALM-07=1) |
Alarm (ALM-07=2) |
FanCmd |
Status1 off |
FailCmdAlarm |
OffAlarm |
FanCmd |
Status1 on |
FailCmdAlarm |
OnAlarm |
Fan belt alarm
The macro generates fan belt alarms with a time delay defined by ALM-06, if the "FanBeltIn" input does not detect airflow after the fan has switched on.
The fan belt alarm reset is manual by default and can be changed with parameter ALM-04.
Output |
Status |
Fan belt alarm |
FanCmd |
FanBeltIn off |
FanBeltAlarm |
Alarm input
The alarm point "Alarm" will generate a point alarm or will set the output "CommAlarm" into alarm. The outputs "FanCmd" or "FanSpeedControl" will stay on. Operation mode 11 has priority over the alarm input and will switch the fan off.
Maintenance switch alarm
The maintenance switch has the highest priority and it generates a fan off alarm if activated.
With the parameter ALM-01 can be differentiated whether the repair switch is NO or NC.
MaintSw |
Alarm |
MaintSw off |
OffAlarm |
Common alarm output
The output "CommAlarm" will be in alarm whenever one of the fan on-/ off- or fail to command alarm, fan belt alarm, the alarm input or "MaintSw" is active.
Manual- or automatic reset of fan alarms
The user can choose between manual or automatic reset resetting the parameter ALM-03.
In case of manual reset, the user has to connect the "Reset" input of the macro to the reset button.
Description |
Default value |
ALM-01: maint switch NO/ NC; 1 = NC |
1 |
ALM-02: maint switch reset type 0 = manual reset 1 = auto reset |
1 |
ALM-03: fan alarm reset type 0 = manual reset 1 = auto reset |
1 |
ALM-04: fan belt alarm reset type 0 = manual reset 1 = auto reset |
0 |
ALM-05: delay status alarm; 0 = disable |
60 sec |
ALM-06: delay fan belt alarm; 0 = disable |
120 sec |
ALM-07: status alarm type 0 = no alarm 1 = fail to command alarm 2 = on/ off alarms |
0 |
DISP-01: fan belt alarm; 1 = alarm |
- |
DISP-02: fan fail cmd alarm; 1 = alarm |
- |
DISP-03: fan on alarm; 1 = alarm |
- |
DISP-04: fan off alarm; 1 = alarm |
- |