{}

Our Brands

Impact-Company-Logo-English Black-01-177x54

Welcome to the Schneider Electric Website

Welcome to our website.
Search FAQs
What are the points to check in case of SLF1 fault on Altivar71/61 drive?
Issue:
SLF1 fault causes on Altivar71/61 drive

Product Line:
All ATV61 ATV71

Environment:
All

Cause:
Fault condition drive will not run.

Resolution:
A modbus communication fault indicates that the communication has worked properly between the drive and the server.  But during the time set in [Modbus time out] (ttO) parameter, a loss of communication has been detected.

On configuration:
- Check the server state (RUN, stop…).
- Check if there is no network overload.
- Check the time out value (try to increase the value).
- Check the time between the sending of 2 Modbus requests (if the time is higher than the time out value, the drive can trip in fault).

On environment:
- Use the Telemecanique cable with 2 pairs of shielded twisted conductors (catalog number: TSXCSA100, TSXCSA200 or TSXCSA500).
- Keep the Modbus cable away from the power cables (30 cm minimum).
- If it is necessary for the Modbus cable and the power cables to cross each other, be sure they cross at right angles.
- A reflection in a transmission line is the result of an impedance discontinuity that a traveling wave sees as it propagates down the line. To minimize the reflections from the end of the RS485-cable, it is required to place a line termination near each of the 2 ends of the bus.
- Whenever possible, connect the cable shielding to the protective ground, e.g., to the ground of each device if this ground is connected to the protective ground.

Schneider Electric Saudi Arabia

Explore more
Range:
Articles that might be helpful Users group

Discuss this topic with experts

Visit our Community for first-hand insights from experts and peers on this topic and more.
Explore more
Range: