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 "FanCmd" will stay:


Output

Status

Alarm (ALM-07=1)

Alarm (ALM-07=2)

FanCmd

Status1 off

FailCmdAlarm

OffAlarm

FanCmd

Status1 on

FailCmdAlarm

OnAlarm


Fan belt alarm

The macro generates fan belt alarms with a time delay defined by ALM-06, if the "FanBeltIn" 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

FanCmd

FanBeltIn off

FanBeltAlarm


Alarm input

The alarm point "Alarm"  will generate a point alarm or will set the output "CommAlarm" into alarm. The outputs "FanCmd" or "FanSpeedControl" will stay on. Operation mode 11 has priority over the alarm input and will switch the fan off.


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 alarm, fan belt alarm, the alarm input or "MaintSw" is active.


Manual- or automatic reset of fan alarms

The user can choose between manual or automatic reset resetting the parameter 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

DISP-01: fan belt alarm; 1 = alarm

-

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

-

DISP-03: fan on alarm; 1 = alarm

-

DISP-04: fan off alarm; 1 = alarm

-