E-42 Braking Resistance fault in Toshiba drive
E-42 Braking Resistance Fault fault in Toshiba drive
Description Distinct from "db" (Short Circuit) or "OLr" (Thermal Overload), E-42 is a resistance check failure. The drive measures the current flowing to the braking resistor during operation. If the current is higher than Ohm's Law predicts (meaning Resistance is lower than expected), it trips E-42. This protects the IGBT chopper from handling current beyond its rating. Causes
1. Wrong Resistor: Installing a 5-Ohm resistor on a drive that requires a minimum of 10-Ohms.
2. Partial Short: The resistor coils are sagging and touching, reducing the effective resistance by half.
3. Wiring Error: Wiring two resistors in parallel instead of series, halving the total resistance. Solution Disconnect the resistor bank. Measure the total resistance with a multimeter.
Consult the Toshiba manual for "Minimum Permissible Braking Resistance" for your specific HP/kW model.
Example: If the manual says "Min: 20 Ohms" and your resistor bank measures 10 Ohms, you CANNOT use it. You will burn out the braking transistor. You must re-wire the resistors in series to increase the ohms (e.g., 10 + 10 = 20 Ohms).
Description Distinct from "db" (Short Circuit) or "OLr" (Thermal Overload), E-42 is a resistance check failure. The drive measures the current flowing to the braking resistor during operation. If the current is higher than Ohm's Law predicts (meaning Resistance is lower than expected), it trips E-42. This protects the IGBT chopper from handling current beyond its rating. Causes
1. Wrong Resistor: Installing a 5-Ohm resistor on a drive that requires a minimum of 10-Ohms.
2. Partial Short: The resistor coils are sagging and touching, reducing the effective resistance by half.
3. Wiring Error: Wiring two resistors in parallel instead of series, halving the total resistance. Solution Disconnect the resistor bank. Measure the total resistance with a multimeter.
Consult the Toshiba manual for "Minimum Permissible Braking Resistance" for your specific HP/kW model.
Example: If the manual says "Min: 20 Ohms" and your resistor bank measures 10 Ohms, you CANNOT use it. You will burn out the braking transistor. You must re-wire the resistors in series to increase the ohms (e.g., 10 + 10 = 20 Ohms).
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