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 "Stage1Cmd" will stay:
.
Output |
Status |
Alarm (ALM-07=1) |
Alarm (ALM-07=2) |
Stage1Cmd on |
Status1 off |
FailCmdAlarm |
OffAlarm |
Stage1Cmd off |
Status1 on |
FailCmdAlarm |
OnAlarm |
Fan belt alarm
The macro generates fan belt alarms with a time delay defined by parameter ALM-06, if the fan belt 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 |
Stage1Cmd on |
FanBeltIn off |
FanBeltAlarm |
Alarm input
The alarm point "Alarm" will generate only a point alarm and directly a common alarm. The output "Stage1Cmd" will stay on.
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 alarms, fan belt alarm, alarm input or "MaintSw" is active.
Manual- or automatic reset of alarms
The user can select manual or automatic reset of alarms, setting the parameter ALM-02/ 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 |