en – Original instructions
27
7.10 Tripping of the differential protection
Power cable of the motor faulty or
worn
Differential switch not compliant
with the specifications
Replace the differential switch
Differential current too high
Contact a qualified technician to have the electrical system modified
7.11 The pump unit runs at maximum speed without stopping
Pressure setpoint not suitable for
the system (the value is higher than
the pressure that the pump unit can
deliver)
Set the new setpoint according to the performance of the pump unit
Sensor not connected or damaged
Check the hydraulic and electrical connection of the sensor
7.12 Only one pump unit is running
The pump units have different
settings
1.
Check setting of the frequency converter
2.
Check the serial connection between the two frequency converters
7.13 There is demand for water but the pump unit does not start
The setpoint is set at zero
1.
Check setting of the frequency converter
2.
Set the setpoint
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