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Troubleshooting
Steadypres VSD
PROBLEM
The pump is not feed
Message
Cause
Intervention
none
Interruption of power supply
Replace the power supply
none
Burned fuses
Substitute the fuses
none
Intervention of the line protections
Check the correct protecttions setting
INPUT ERROR
(only mod. T/T) - connections LINE and MOTOR
were reversed
Check the connections LINE and MOTOR and
connect correctly
PROBLEM
The current circuit breaker has tripped to
protect the DGBOX power line
Message
Cause
Intervention
none
The residual current circuit breaker is
inadequate for inverter supply
Replace the residual current circuit breaker with
a model suitable for the pulsating components
and in direct current (class A)
PROBLEM
The pump fails to start
Message
Cause
Intervention
OFF
The pump is out of service
(placed manually out of service)
Put the pump back into service by
pushing START
PROBLEM
The pump stopped and fails to re-start
Message
Cause
Intervention
OVER CURRENT
overcurrent absorption compared to set value
(parameter A in BASE PARAMETER)
• check the correct current setting
• check the power voltage under load at pump
terminals (min -15%)
• make sure the motor pump is turning freely
and is not braked
• check the correct direction of rotation
• check the correct sizing of the wires
CURRENT LIMIT
Serious overcurrent absorption which inverter
cannot cope with
Make sure the motor pump is not blocked,
reduce the motor acceleration by means of the
ACCELERATION parameter.
DRY RUNNING
(DRY RUNNING PF)
• Lack of water at suction
• pump not primed
• suction blocked
• wrong direction of motor rotation
• Check correct suction conditions
• prime the pump
• check the suction piping
• check the correct direction of motor rotation
LOW PRESS
The system does not reach the minimum
pressure
Check that there are no broken pipes.
LOW VOLTAGE
Deviation of the supply voltage higher than
–15% of the plate voltage
Check the supply voltage and the section and
length of the inverter power cables
HIGH VOLTAGE
Deviation of the supply voltage higher than
+15% of the plate voltage
Check the supply voltage
OVER TEMP BOX
(solo T/T)
internal overheating due to overload or exces-
sive ambient temperature
Make sure the air cooling channels are free and
that the fans are working, check the pump load
• Check that the inverter has been correctly connected to the power line (which is on)
• Check that the motor pumps have been correctly connected to the inverter
• Check that all the cables and connections are operative.