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 |