E-11Â II Analog Input Signal Loss fault in Toshiba drive
E-11 II Analog Input Signal Loss (Current) fault in Toshiba drive
Description Similar to E-10, E-11 is specific to the "II" (Current Input) terminal, used for 4-20mA signals. In a 4-20mA loop, "4mA" represents 0% speed. If the wire is cut, the current drops to 0mA. The drive sees this "0mA" as a fault condition (broken wire) rather than a "Stop" command. E-11 safeguards processes (like PID pressure loops) from spiraling out of control when feedback is lost. Causes
1. Loop Break: The series circuit is open. 4-20mA loops must be continuous.
2. Power Supply: The transducer (sensor) is not powered.
3. Dip Switch: The hardware switch on the drive is set to "V" (Voltage) instead of "I" (Current), causing the input impedance to be too high to conduct current. Solution First, check the "V/I" or "SW2" switch on the control board. It MUST be set to "I".
Measure the current. Break the circuit and insert a multimeter in series.
- If 0mA: Check wiring.
- If 4mA: The signal is good. Check the parameter for "II Signal Loss Level." It is usually set to 20% (which is 4mA). If the sensor drifts to 3.9mA, it might trip. Lower the detection level to 10% (2mA) to provide a safety margin for sensor drift.
Description Similar to E-10, E-11 is specific to the "II" (Current Input) terminal, used for 4-20mA signals. In a 4-20mA loop, "4mA" represents 0% speed. If the wire is cut, the current drops to 0mA. The drive sees this "0mA" as a fault condition (broken wire) rather than a "Stop" command. E-11 safeguards processes (like PID pressure loops) from spiraling out of control when feedback is lost. Causes
1. Loop Break: The series circuit is open. 4-20mA loops must be continuous.
2. Power Supply: The transducer (sensor) is not powered.
3. Dip Switch: The hardware switch on the drive is set to "V" (Voltage) instead of "I" (Current), causing the input impedance to be too high to conduct current. Solution First, check the "V/I" or "SW2" switch on the control board. It MUST be set to "I".
Measure the current. Break the circuit and insert a multimeter in series.
- If 0mA: Check wiring.
- If 4mA: The signal is good. Check the parameter for "II Signal Loss Level." It is usually set to 20% (which is 4mA). If the sensor drifts to 3.9mA, it might trip. Lower the detection level to 10% (2mA) to provide a safety margin for sensor drift.
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