Nidec Unidrive M700 Troubleshooting

EtherNet/IP RPI timeout: The request packet interval (RPI) configured in the PLC must be greater than the drive response time. Pr 4.20.011 can be set to take action after timeout (maintain last value, reset or trip).

2. EIA 485 Communication (M701)

Wiring: Use RJ45 connectors, pins 2 (RX/TX+), 3 (0V), and 7 (RX/TX -). Please note that EIA 485 dedicated cables must be used and regular network cables are not allowed.

Terminal resistance: For long distances (>100 meters) or high baud rates (>38.4k), a 120 Ω terminal resistor should be connected at both ends of the network (which can be achieved by short circuiting RJ45 pins 1 and 7).

Address and baud rate: Pr 11.023 sets the address (1-247), Pr 11.025 sets the baud rate. After modification, Pr 00.052 needs to be set to 1 and the driver reset to take effect.

NV Media Card Data Backup and Fast Copy

Unidrive M supports parameter cloning using SMARTCARD or SD card (FAT16/32), greatly simplifying batch configuration of multiple drives.

1. Common operation codes (entered in Pr mm.000)

Code functionality

4001 Save all current parameters to file 001 on the card

6001 Load parameters from file 001 on the card to the driver

2001 Create bootable parameter block (automatically loaded upon power up)

9666 Set warning suppression flag (ignore option module or voltage level differences)

9777 Clear read-only flag

2. Fault handling

Card Option: The option module types or slots of the source and destination drives are inconsistent. Data can still be transmitted, but mismatched option menu parameters will be restored to default. This trip can be suppressed by setting 9666.

Card Rating: Different voltage or current levels. The RA attribute parameters will not be overwritten. If safety is confirmed, the warning can be suppressed.

Card Compare: Inconsistent comparison. Used to verify whether the parameters of two drives are completely consistent.

Engineering suggestions for improving system reliability

Regular inspection: Use Pr 10.020~10.029 to view the last 10 trip records and their occurrence times (Pr 10.041~10.060), which can help analyze occasional faults.

Thermal management: Monitor Pr 07.036 (Drive Thermal Accumulation Percentage), and when it exceeds 90%, an "Drive Overload" alarm will appear. It is necessary to strengthen heat dissipation or reduce the load.

Braking resistor: If an external braking resistor is used, Pr 10.030 (rated power), Pr 10.031 (thermal time constant), and Pr 10.061 (resistance value) must be set correctly, otherwise it will falsely report "Brake R Too Hot".

Firmware upgrade: Use Control Techniques PC tool via Ethernet or serial port to update firmware, fix known issues, and add new features. Be sure to backup the parameters before upgrading.

Grounding and shielding: All signal lines (encoders, analog signals, communication) use shielded cables, and the shielding layer is grounded 360 ° low impedance through the driver grounding clip. Avoid parallel wiring with power lines, with a minimum spacing of 200mm.