ABB PSTX30 Installation And Commissioning Manual page 139

Status
Current underload protection
User defined protection
Too long current limit protection
By-pass open protection
Fieldbus failure protection
Extension I/O failure protection
HMI failure protection
Limit number of starts
10.5 Fault indication shown on screen
For Faults description, see chapter 7.21 Faults (26) Internal faults (27) External faults
Table 3
Fault indication
Status
Phase loss fault
High current fault
Low supply voltage fault
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Possible cause
The motor current has fallen below
the settable value.
Programmable digital input can be
used in combination with external
device/sensor to provide to the
user the possibility of handling
own defined protection.
The time at current limit has
exceeded the set value.
The starting condition is too heavy
for the set current limit.
By pass contactor or relay does
not close when reached TOR.
There is a communication
disturbance between the
softstarter and PLC.
There is communication
disturbance between the
softstarter and the extension I/O
module.
There is communication
disturbance between the
softstarter and the HMI.
The HMI has been removed.
The softstarter has exceeded the
pre-set limited number of starts.
Possible cause
Voltage to one or more phases is
missing.
Fuse is blown.
Power loss on operational current
for one or several phases.
The line contactor or circuit
breaker is open.
Line contactor opens too quickly
at stop.
A fault current, higher than 8 times
the softstarter rated current, has
occurred.
The control supply voltage is too
low on terminals 1 and 2.
Short power loss on the control
supply network.
Solution
• Check and correct the reason for the underload.
• Check that the motor current parameter (Ie) is set
correctly.
• Set the programmable input signal to inactive state
before resetting the protection event.
• Check starting conditions and parameters.
• Check and contact your ABB sales office.
• Check that the fieldbusplug is connected correctly.
• Check that correct type of fieldbusplug is used.
• Check that the parameter Fieldbus Type is set
according to the present fieldbus type.
• Check and correct the connections.
• Check and correct the connections.
• Place back the HMI again.
• Wait for the next start interval.
For parameter setting, see chapter 7 Functions.
Solution
• Check that the mains are connected and that no line
contactor or breaker is open.
• Check and replace fuses for all three phases.
• Check and correct operational network supply.
• Check and close contactor/breaker or any external
switch device.
• Control Line contactor with Run signal relay on
terminal 4. See 5.1.2.5 Programmable output relay -
K4, terminals 4, 5 and 6.
• Add a time relay before contactor opens.
• If Stop Ramp not is needed, set Stop mode to direct
stop.
• Check the circuits, including the motor for any
insulation fault phase to phase or earth fault.
• Check for voltage dips or interruptions and correct
control supply voltage.
• Check control supply network for short interruptions.
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