KSB PumpDrive 2 - Tripping at Phase Failure and Short Circuit; Broken Wire Detection (Live Zero)

8 Commissioning/Shutdown
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PumpDrive 2
Parameter Description Possible settings Refers to Factory setting
3-3-7-5 I²t Triggering Characteristic
Based on the I²t triggering
characteristic, a period of time is
calculated dynamically during which
the motor may be operated at a
higher current until I²t control is
activated.
1 .. 60 s - 60 s
3-3-7-6 I²t Stop Speed
This speed limit causes a Dynamic
Overload Protection alert to be
output, at which time the motor is
stopped.
Minimum to maximum
speed of motor
- 3-2-2-1
8.8.2.5 Tripping at phase failure and short circuit
Phase failure and short circuit result in direct tripping (without stop ramp). This
protective function does not need to be parameterised.
8.8.2.6 Broken wire detection (live zero)
The control system monitors all analog inputs at which a sensor has already been
detected or for which a sensor has been permanently set for broken wire (live zero).
A prerequisite are signals with 4 - 20 mA or 2 - 10 V. If the lower voltage or current
value is defined as 0 V or 0 mA, cable integrity monitoring is not carried out for the
corresponding analog input. If the value falls below 4 mA or 2 V, a parameterisable
response is initiated after a parameterisable time delay.
If the sensor relates to the actual value source and dedicated control is no longer
possible due to a lack of redundancy, the No Master Control alert is output (or
otherwise, the Failure of Actual Value warning).
A Broken Wire warning is output if no control function is active. The alerts and
warnings are self-acknowledging. In the event of an alert (control no longer
possible), a configurable response is implemented:
▪ Stop all pumps
▪ Maintain speed
▪ Configurable speed
Table64: Broken wire detection parameter (live zero)
Parameter Description Possible settings Factory setting
3-9-1-1 Response to Failure
Operating behaviour of frequency inverter
upon Failure of Actual Value alert
▪ All Pumps OFF
▪ Maintain Speed
▪ Fixed Speed
Maintain Speed
3-9-1-2 Time Delay
Time delay before the message (warning
or alert) is triggered. In a redundant
system, only a warning is output as the
auxiliary master can assume the function.
Only if the actual value also fails at the
auxiliary master is an alert output, which
then triggers the specified response to
actual value failure (pump changeover).
0,0…10,0s 0,5s
3-9-1-3 Speed During Failure
Fixed speed that is activated when the
actual value fails.
Minimum to maximum speed of
motor
3-2-2-1