Err (Err1 to Err9) Communication / Connection Error fault in Toshiba drive
Err (Err1 to Err9) Communication / Connection Error fault in Toshiba drive
Description These faults indicate a breakdown in communication between the drive and an external controller (PLC, HMI, SCADA) or between the drive's main board and keypad. Err4 or Err5 are common for CPU errors or Modbus timeouts. It means the drive expected a "heartbeat" signal from the PLC but didn't receive it within the set timeout period. Causes
1. Wiring Issues: Broken RS485 wires, crossed A/B terminals, or loose shielding.
2. Noise/Interference: running communication cables next to high voltage motor cables without shielding.
3. Termination: Lack of termination resistors (120 ohm) at the end of the daisy chain.
4. Parameter Mismatch: Baud rate, Parity, or Station ID does not match the PLC configuration.
5. Timeout Setting: The "Communication Error Action" timer is too sensitive. Solution Troubleshooting starts with the physical layer. Check the RS485/Ethernet cables. Are they shielded? Is the shield grounded at one end only? Use a multimeter to check continuity. Ensure the wires are twisted pair.
Check the communication parameters on the Toshiba drive (F800 series usually).
- Baud Rate: Must match the PLC (e.g., 9600 or 19200).
- Parity: Even, Odd, or None. This is the most common mismatch cause.
- Slave Address: Ensure the drive has a unique ID (e.g., 1, 2, 3) and no two devices share an ID.
If the network is busy, the PLC might be slow to respond. Increase the "Communication Timeout" parameter on the drive (e.g., increase from 1.0s to 3.0s). This gives the PLC more time to talk before the drive panics and trips.
If the Keypad displays "Err" and won't respond, the connection between the keypad and the drive body is loose. Remove the keypad, clean the contacts (RJ45 connector), and reseat it firmly.
Description These faults indicate a breakdown in communication between the drive and an external controller (PLC, HMI, SCADA) or between the drive's main board and keypad. Err4 or Err5 are common for CPU errors or Modbus timeouts. It means the drive expected a "heartbeat" signal from the PLC but didn't receive it within the set timeout period. Causes
1. Wiring Issues: Broken RS485 wires, crossed A/B terminals, or loose shielding.
2. Noise/Interference: running communication cables next to high voltage motor cables without shielding.
3. Termination: Lack of termination resistors (120 ohm) at the end of the daisy chain.
4. Parameter Mismatch: Baud rate, Parity, or Station ID does not match the PLC configuration.
5. Timeout Setting: The "Communication Error Action" timer is too sensitive. Solution Troubleshooting starts with the physical layer. Check the RS485/Ethernet cables. Are they shielded? Is the shield grounded at one end only? Use a multimeter to check continuity. Ensure the wires are twisted pair.
Check the communication parameters on the Toshiba drive (F800 series usually).
- Baud Rate: Must match the PLC (e.g., 9600 or 19200).
- Parity: Even, Odd, or None. This is the most common mismatch cause.
- Slave Address: Ensure the drive has a unique ID (e.g., 1, 2, 3) and no two devices share an ID.
If the network is busy, the PLC might be slow to respond. Increase the "Communication Timeout" parameter on the drive (e.g., increase from 1.0s to 3.0s). This gives the PLC more time to talk before the drive panics and trips.
If the Keypad displays "Err" and won't respond, the connection between the keypad and the drive body is loose. Remove the keypad, clean the contacts (RJ45 connector), and reseat it firmly.
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