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

-