ABB PSTX720 - 10.5 Fault indication shown on screen

164 Troubleshooting | Installation and commissioning manual | 1SFC132081M0201
Status Possible cause Solution
Power factor underload The power factor is below the
normal level.
• Examine and correct the reason for the underload.
Too long current limit The time at current limit is higher
than the set value.
The starting condition is too heavy
for the set current limit.
• Do a check of the starting conditions and parameters.
Bypass open fault Bypass contactor or relay does not
close when reached TOR.
• Do a check and speak to your ABB sales office.
Fieldbus communication failure There is a communication error
between the Softstarter and PLC.
• Make sure that the FieldBus Plug is connected
correctly.
• Make sure that correct type of FieldBus Plug is used.
• Make sure that the parameter Fieldbus Type is set for
the present Fieldbus type.
24V output The 24V voltage outputs is
overloaded or shorted.
• Do a check of the connections.
HMI failure
There is a communication error
between the Softstarter and the
HMI.
• Do a check of the connections and correct it.
The HMI is removed. • Put the HMI back.
Extension IO failure There is a communication error
between the Softstarter and the
extension I/O module.
• Do a check of the connections and correct it.
Max number of start per hour The Softstarter made more starts
than the pre-set limited number
of starts.
• Wait for the next start interval.
For parameter, see chapter 7 Functions.
Auto-restart time-out
The time between trip and auto-
restart attempt exceeds setting.
• Do a check of the automatic restart parameters and
correct it.
Too long start time The time to soft start the motor is
longer than the set value.
• Do a check of the starting conditions and current
limit..
Frequency range The frequency has been outside
the allowed range longer than the
allowed time.
• Do a check of the main voltage.
10.5 Fault indication shown on screen
For a description of the faults, see chapter 7.19 Faults
Table 3 Fault indication
Status Possible cause Solution
High current A fault current, higher than 8 times the
Softstarter rated current, has occurred..
• Do a check of the circuits and the motor for an
insulation fault phase to phase or ground fault.
Phase loss Voltage to 1 or more phases is missing. • Make sure that the mains are connected and that
no line contactor or breaker is open.
Fuse is blown. • Do a check of the fuses for all 3 phases. Replace
blown fuse.
Power loss on operation current for 1 or
multiple phases.
• Do a check of the operation network supply.
Correct it.
The line contactor or circuit breaker is open. • Do a check of the contactor/breaker or an external
switch device. Close it.
Line contactor opens too quickly at stop. • Control Line contactor with Run signal relay on
terminal 4. See chapter 5.1.2.6 Programmable
output relay - K4, terminals 4, 5 and 6.
• Add a time relay before contactor opens.
• If Stop Ramp is not necessary, set Stop mode to
direct stop.
10