Fan alarms
This module provides a status alarm output.
If parameter ALM-05 > 0 the macro generates a FailCmdAlarm, as shown in the following tables. If the alarm conditions are true, the alarms will occur after a delay defined by the value of the parameter ALM-05.
If the parameter ALM-03 = 1, and an alarm is generated, the output "Stage1Cmd" will stay in the output position which has caused the alarm
Output |
Status |
Alarm (ALM-05 > 0) |
Stage1Cmd on |
Status1 off |
FailCmdAlarm |
Stage1Cmd off |
Status1 on |
FailCmdAlarm |
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 switch off the output "Stage1Cmd".
With the parameter ALM-01 can be differentiated whether the repair switch NO or NC.
MaintSw |
Alarm |
MaintSw off |
CommAlarm |
Common alarm output
The output "CommAlarm" will be in alarm whenever the fan fail to command alarm, fan belt alarm, alarm input or "MainSw" 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 |