E-08Â FM Terminal fault in Toshiba drive
E-08 FM Terminal Fault (Analog Output) fault in Toshiba drive
Description The FM terminal (Frequency Meter) is a configurable analog output used to send data (like Speed, Amps, or Torque) to a remote display, PLC, or panel meter. E-08 indicates a hardware failure specifically on this output channel. The drive detects that the FM terminal is shorted to ground or the internal D/A (Digital to Analog) converter driving it has drawn excessive current. This protects the control board from burning out. Causes
1. Field Wiring Short: The wire connecting the FM terminal to the remote meter has been pinched and is touching the metal cabinet/ground.
2. Low Impedance Load: The device connected to the FM terminal has an impedance lower than the supported minimum (usually 1k Ohm).
3. Incorrect Meter: Connecting a standard Ammeter (low resistance) directly to the FM terminal without configuring the terminal for current mode (if supported).
4. Internal Circuit Failure: The driving transistor for the FM output is blown. Solution Disconnect the wire from the FM terminal. Cycle power to the drive.
If E-08 clears with the wire removed, the issue is external. Use a multimeter to measure the resistance of your external circuit (between the disconnected wire and Common). If it measures near 0 ohms, you have a short in the field wiring or the remote meter is defective.
If E-08 remains even with no wires attached, the FM output circuit on the control board is dead. You may need to replace the control board.
Workaround: If the FM terminal is dead but the AM terminal (another analog output) is available, you can re-map the parameter functions to use AM instead of FM for your metering needs.
Description The FM terminal (Frequency Meter) is a configurable analog output used to send data (like Speed, Amps, or Torque) to a remote display, PLC, or panel meter. E-08 indicates a hardware failure specifically on this output channel. The drive detects that the FM terminal is shorted to ground or the internal D/A (Digital to Analog) converter driving it has drawn excessive current. This protects the control board from burning out. Causes
1. Field Wiring Short: The wire connecting the FM terminal to the remote meter has been pinched and is touching the metal cabinet/ground.
2. Low Impedance Load: The device connected to the FM terminal has an impedance lower than the supported minimum (usually 1k Ohm).
3. Incorrect Meter: Connecting a standard Ammeter (low resistance) directly to the FM terminal without configuring the terminal for current mode (if supported).
4. Internal Circuit Failure: The driving transistor for the FM output is blown. Solution Disconnect the wire from the FM terminal. Cycle power to the drive.
If E-08 clears with the wire removed, the issue is external. Use a multimeter to measure the resistance of your external circuit (between the disconnected wire and Common). If it measures near 0 ohms, you have a short in the field wiring or the remote meter is defective.
If E-08 remains even with no wires attached, the FM output circuit on the control board is dead. You may need to replace the control board.
Workaround: If the FM terminal is dead but the AM terminal (another analog output) is available, you can re-map the parameter functions to use AM instead of FM for your metering needs.
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