Fan alarms

This module provides a status alarm output.

If parameter ALM-05 > 0 the macro generates FailCmdAlarms, 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" and Stage2Cmd" will stay in the output position which has caused the alarm.


Separate status connections


Output

Status

Alarm (ALM-05>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-06>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-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

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  switch of the stages "Stage1Cmd" and "Stage2Cmd".

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 one of the fail to command alarms, fan belt alarms, alarm inputs, or "MainSw" is active.


Manual- or automatic reset of fan 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

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: 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

DISP-01: fan belt alarm; 1 = alarm

-

DISP-02: fan fail cmd alarm; 1 = alarm

-