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6.
Basic TCP Modbus Diagnostic Information
PSE trips on fieldbus fault (EF40)
– The purpose of the fieldbus fault function is to detect any communication problems be-
tween the Modbus master and the Softstarter. Fieldbus fault will be enabled if the
Fieldbus control parameter is set to On and Operation when fault parameter is set to trIP.
– When fieldbus fault reaction is set to trip, the Softstarter will trip on Fieldbus Fault (EF40)
after a set time of no communication. The timeout parameter value is set to 10 s and can-
not be changed.
– If there has been a trip on fieldbus fault for some reason, the communication has to after-
wards be continuously stable for 10 s before the Softstarter accepts commands from the
Modbus master and when it is possible to reset the fault.
– If the Reset of Fieldbus Fault PSE parameter is set to Auto and the fieldbus fault (EF40)
has tripped due to no communication, 30 s of stable communication is required before an
automatic reset is performed.
Motor does not start
– If fieldbus fault reaction is set to "switch to local" control and fieldbus communication is
lost and/or timeout is reached, the Softstarter can only be controlled with hard-wire sig-
nals. When communication is re-established, there is a 10 second delay before fieldbus
control is possible.
– Check if the fieldbus control parameter is set to ON.
– Make sure the auto mode is enabled in order to control the motor with Modbus. The data
value in respective protocol address for the connected PSE devices shall be set.
– Check if the stop coil is set since it has higher priority than the start coil.
– Motor will not start if there is an active fault (check the ready to start coil).
7.
Contact us
For more information, please contact
your local ABB representative or visit
https://new.abb.com/drives/softstarters
STATUS
Approved
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SECURITY LEVEL
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DOCUMENT ID.
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