FIELDBUS COMMUNICATION
STATUS
Approved
SECURITY LEVEL
Public
DOCUMENT ID.
1SFC132374M0201
REV.
B
LANG.
en
PAGE
23/23
© Copyright 2019 ABB. All rights reserved.
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
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