Pump alarms

Depending on the status connections and the value of parameter ALM-03, different types of alarms will be generated, as shown in the next tables.

The module provides three status alarm outputs. The status alarms are delayed by the value of parameter ALM-01.

To configure pump-on, pump-off or fail-to-command alarm, set ALM-03 to:


Alarm type ALM-03

Alarm output behaviour

No alarm (0)

Only status monitoring is done and no alarms are generated

Failed to command alarm (1)

The status is monitored and a fail-to-command alarm is generated after the time of the delay defined in parameter ALM-01

Separate On and Off alarms (2)

The status is monitored and differentiated on/ off alarms are generated, after the delay of the parameter ALM-01


Separate status connections


Output

Status

Alarm (ALM-03=1)

Alarm (ALM-03=2)

Pmp1Cmd on

Status1 off

FailCmdAlarm1

OffAlarm1

Pmp2Cmd on

Status2 off

FailCmdAlarm2

OffAlarm2

Pmp1Cmd off

Status1on

FailCmdAlarm1

OnAlarm1

Pmp2Cmd off

Status2 on

FailCmdAlarm2

OnAlarm2


Combined status connection



Output

Status

Alarm (ALM-03=1)

Alarm (ALM-03=2)

Pmp1Cmd on

Pmp2Cmd off

Status1/2 off

FailCmdAlarm1

OffAlarm1

Pmp1Cmd off Pmp2Cmd on

Status1/2 off

FailCmdAlarm2

OffAlarm2

Pmp1Cmd off

Pmp2Cmd off

Status1/2 on

FailCmdAlarm1

FailCmdAlarm2

OnAlarm1

OnAlarm2

Pmp1Cmd on

Pmp2Cmd on

Status1/2 off

FailCmdAlarm1

FailCmdAlarm2

OffAlarm1

OffAlarm2



Alarm inputs

The alarm points "Alarm1" and "Alarm2" will trigger an alarm changeover. The outputs "Pmp1Cmd" or "Pmp2Cmd" will switch off  during alarm.


Manual- or automatic reset of alarms

The alarm reset happens on the positive edge of the Reset signal.
A reset will be done even if the pump enable input is still on.

We recommend to solve the alarm root cause before activating a reset signal, other wise the alarm will occur again.


In case of an active alarm, manual or automatic reset of alarms can be selected, depending on the setting of parameter ALM-02.        


Note1:

When an manual reset function is selected (ALM-02 = 0), the related outputs "Pmp1Cmd" or "Pmp2Cmd" will be switched off in case of off- or fail to command alarms.

This way it is assured that in case of alarm changeover of pumps, we never command two pumps at the same time.

In case of an OnAlarm - we get a status feedback even if the command output is off. This means that the contact got stuck, which anyway can happen only in case of a damaged pump.


Note2:

When an automatic reset function was selected (ALM-02 = 1), the related outputs "Pmp1Cmd" or "Pmp2Cmd" will also be switched off in case of on-/ off- or fail to command alarms.

If the pump command outputs would stay on during alarms we could get problems if the pump would be repaired during the alarm state.

This could lead to problems with big pumps if both would be switched on even for a short time.

For on alarms see Note 1.


Automatic reset can occur only after the input "PumpEnable" switches off or an automatic pump changeover.


            Pump behaviour for automatic or manual reset


Common alarm output

The output CommAlarm will be in alarm whenever one of the pump on-/ off- or fail to command alarms or alarm inputs is in alarm.

Parameter List

-Description

Default value

ALM-01: delay status alarm

0 = disable

60 sec

ALM-02: alarm reset type

<0 = limited auto reset

0 = manual reset

1 = auto reset

1

ALM-03: status alarm type

0 = no alarm;

1 = fail to command alarms

2 = on/ off alarms

1