Fan alarms
This module provides a status alarm output.
If the Parameter ALM-04 >0 and the alarm conditions are true, the macro generates a alarm.The alarm conditions are shown in the following tables.
If the parameter ALM-03 = 1, and an alarm is generated, the output "Stage1Cmd" and Stage2Cmd" will stay in the output position which has caused the alarm.
Separate status connections
Output |
Status |
Alarm (ALM-04>0) |
Stage1Cmd on |
Status1 off |
FailCmdAlarm |
Stage2Cmd on |
Status2 off |
FailCmdAlarm |
Stage1Cmd off |
Status1 on |
FailCmdAlarm |
Stage2Cmd off |
Status2 on |
FailCmdAlarm |
Combined status connection
Output |
Status |
Alarm (ALM-04>0) |
Stage1Cmd on Stage2Cmd off |
Status1/2 off |
FailCmdAlarm |
Stage1Cmd off Stage2Cmd on |
Status1/2 off |
FailCmdAlarm |
Stage1Cmd off Stage2Cmd off |
Status1/2 on |
FailCmdAlarm |
Stage1Cmd on Stage2Cmd on |
Status1/2 off |
FailCmdAlarm |
Fan belt alarm
The macro generates fan belt alarms with a time delay defined by ALM-05, if the fan belt input does not detect airflow after the fan has switched on.
Output |
Status |
Fan belt alarm |
Stage1Cmd on |
FanBeltIn off |
FanBeltAlarm |
Stage2Cmd on |
FanBeltIn off |
FanBeltAlarm |
Alarm inputs
The alarm points Alarm1 and Alarm2 will generate only point alarms. The outputs "Stage1Cmd" or "Stage2Cmd" will stay on.
Maintenance switch alarm
The maintenance switch has the highest priority and it generates a common alarm if activated.
MaintSw |
Alarm |
MaintSw off |
CommAlarm |
Common alarm output
The output CommAlarm will be in alarm whenever one of the fail to command alarms or alarm inputs or maintenance switch is in alarm.
Manual- or automatic reset of fan alarms
The user can with ALM-02/ ALM-03 choose between manual or automatic reset.
In case of manual reset, the user has to connect the Reset input of the macro to the reset button.
Description |
Default value |
SYS-01: serial/ parallel contacts ST1/ST2 0 = serial 1 = parallel |
0 |
STx-01: delay from off to low speed |
5 sec |
STx-02: delay from low to high speed |
|
STx-03: delay from high to low speed |
30 sec |
NFE-01: delay next fan enable |
60 sec |
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: delay status alarm; 0 = disable |
60 sec |
ALM-05: delay fan belt alarm; 0 = disable |
120 sec |
DISP-01: fan belt alarm; 1 = alarm |
- |
DISP-02: fan fail cmd alarm; 1 = alarm |
- |