E-43 Encoder Z-Phase fault in Toshiba drive
E-43 Encoder Z-Phase Error fault in Toshiba drive
Description For precision positioning applications (Servo mode), the encoder sends a "Z" or "Marker" pulse once per revolution. The drive uses this to home the motor or verify rotation count. E-43 indicates that the A and B pulses are arriving (motor is spinning), but the Z-pulse is missing or arriving at irregular intervals. Causes
1. Encoder Type: The installed encoder does not have a Z-channel (only A/B), but the drive parameter is set to expect one.
2. Broken Wire: The specific wire for the Z-channel is broken or loose.
3. Coupling Slip: The encoder coupling is slipping on the shaft, causing the Z-pulse to appear at random angles relative to the electrical pole position.
4. Noise: Noise is drowning out the narrow Z-pulse. Solution Check the encoder nameplate. Does it list "Z" or "Index"? If not, set the drive parameter "PG Type" to "No Z Phase."
If it has a Z-phase, check the wiring on terminals Z and Z/ (Z-not). Use an oscilloscope to verify the pulse presence. Since the Z-pulse is very short duration, a multimeter cannot usually see it.
Tighten the mechanical coupling. A slipping encoder will confuse the vector algorithm and cause E-43.
Description For precision positioning applications (Servo mode), the encoder sends a "Z" or "Marker" pulse once per revolution. The drive uses this to home the motor or verify rotation count. E-43 indicates that the A and B pulses are arriving (motor is spinning), but the Z-pulse is missing or arriving at irregular intervals. Causes
1. Encoder Type: The installed encoder does not have a Z-channel (only A/B), but the drive parameter is set to expect one.
2. Broken Wire: The specific wire for the Z-channel is broken or loose.
3. Coupling Slip: The encoder coupling is slipping on the shaft, causing the Z-pulse to appear at random angles relative to the electrical pole position.
4. Noise: Noise is drowning out the narrow Z-pulse. Solution Check the encoder nameplate. Does it list "Z" or "Index"? If not, set the drive parameter "PG Type" to "No Z Phase."
If it has a Z-phase, check the wiring on terminals Z and Z/ (Z-not). Use an oscilloscope to verify the pulse presence. Since the Z-pulse is very short duration, a multimeter cannot usually see it.
Tighten the mechanical coupling. A slipping encoder will confuse the vector algorithm and cause E-43.
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