FIELDBUS COMMUNICATION – If the Modbus master has not written any data to the PSE softstarter or read any data from the PSE softstarter for more than the configured timeout time, there will be a trip on fieldbus fault (EF40). This fieldbus fault communication timeout parameter can have a value between from 0.5 to 60 seconds and can be set from the HMI or with the SoftstarterCare™ Service Engineer Tool PC program via USB. If there has been a trip on fieldbus fault for some reason, the communication has to afterwards be continuously sta- ble for 10s before the PSE softstarter accepts commands from the Modbus master and when it is possible to reset the fault.
– If the fault code is EF41, this means a parity error has occurred and in most cases this is due to the parity being incorrectly configured. Check the Modbus frame format parameter and the Modbus master’s parity configuration. 5.3. 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.
Either the data value in protocol address 0105h or bit 5 in the control word (protocol address 0400h) shall be set. – Check if the stop coil/bit is set since it has higher priority than the start coil/bit. – Motor will not start if there is an active fault (check the ready to start coil/bit). 5.4. Parameter write does not work – Check if the parameter download parameter is enabled (set to dPon). – Check if the parameter is read-only. – Check if the value to be written is correctly scaled (see the representation column in sec- tion 3.6). – Check if the value to be written is out of range. – Parameter write operation will not work during a soft start or soft stop.
It will only work in the standby state and top of ramp state. – Check bits 4-15 in protocol address 2003h for diagnostic information related to the latest parameter write operation failure (see section 3.5.1). 6. Contact us For more information, please contact your local ABB representative or visit https://new.abb.com/drives/softstarters © Copyright 2019 ABB. All rights reserved. STATUS Approved SECURITY LEVEL Public DOCUMENT ID. 1SFC132367M0201 REV. B LANG. en PAGE 22/22