Hitachi SJ700B Drive Fault Codes:
| Fault Code and Meaning | Cause and Remedy |
|---|---|
| E01, E02, E03, E04 Overcurrent protection | Cause: If the motor is constrained or suddenly accelerated or decelerated, a high current will flow in the inverter and the inverter may fail. This protective function uses a DC current detector (CT) to detect overcurrent. E01: Constant speed operation E02: Deceleration E03: Acceleration E04: Others Remedy: Check for constraints on the motor, or sudden acceleration/deceleration conditions. |
| E05 Overload protection | Cause: The internal electronic thermal protection circuit monitors the inverter output current and detects a motor overload. The inverter trips according to the setting of the electronic thermal function. Remedy: Check motor load and electronic thermal function settings. Note: The inverter will not accept any reset command within about 10 seconds after tripping. |
| E06 Braking resistor overload protection | Cause: The BRD operation rate exceeds the setting of “b090”. Remedy: Check the usage rate of the braking resistor and the “b090” parameter setting. |
| E07 Overvoltage protection | Cause: The DC voltage across the P and N terminals rises too high (approx. 400 VDC for 200V class, 800 VDC for 400V class) due to energy regenerated by the motor or input voltage increase. Remedy: Check input voltage and motor regeneration conditions. |
| E08 EEPROM error | Cause: Caused by external noise or an abnormal temperature rise. An EEPROM error may result in a CPU error. Remedy: Turn off the inverter power once. If “E08” appears again at power-on, the internal memory may have failed. Initialize the inverter and re-set parameters. |
| E09 Undervoltage | Cause: The input voltage drops and the control circuit cannot function normally. DC voltage across P and N falls below about 175 VDC (200V class) or 380 VDC (400V class). Remedy: Check the input power supply voltage. |
| E11 CT error | Cause: An error occurred in the internal current detector (CT). The CT outputs about 0.6 V or more at power-on. Remedy: Turn off the inverter power. |
| E12 CPU error | Cause: The internal CPU malfunctions or an error occurs in it. Reading abnormal data from the EEPROM may result in a CPU error. Remedy: Turn off the inverter power. Reset commands may not be accepted via keypad; use RS terminal or power cycle. |
| E13 External trip | Cause: An error occurred in the external equipment or device connected to the inverter, and the inverter fetched the error signal. Remedy: Check the external equipment connected to the external trip input. |
| E14 USP error | Cause: The inverter power was turned on while an input operation signal was remaining in the inverter (USP function enabled). Remedy: Remove the input operation signal before powering on, or reset the alarm. |
| E15 Ground-fault protection | Cause: Ground fault detected between the inverter output circuit and the motor upon power-on. Remedy: Check the motor and cabling for ground faults. Turn off the inverter power. |
| E16 Input overvoltage protection | Cause: Input voltage kept above the specification level for 100 seconds while the inverter is stopped (approx. 390 VDC for 200V class, 780 VDC for 400V class). Remedy: Check the input power supply voltage. |
| E20 Instantaneous power failure protection | Cause: An instantaneous power failure lasted 15 ms or more. Remedy: Check power supply stability. If restart mode is selected, inverter restarts after power recovery. |
| E21 Temperature error (Fan/Ambient) | Cause: 1. Lowering of cooling-fan speed is detected. 2. Main circuit temperature rises due to high ambient temperature or other reasons. Remedy: Check cooling fan operation and ambient temperature/ventilation. |
| E23 Gate array communication error | Cause: Communication error between the internal CPU and gate array. Remedy: Internal circuit failure. Turn off power. |
| E24 Phase loss input protection | Cause: Phase loss input detected (when enabled by b006=01). Phase loss continued for about 1 second or more. Remedy: Check input power phases/connections. |
| E25 Main circuit error | Cause: The inverter cannot confirm the on/off state of IGBT due to malfunction, noise, short, or damage to the main circuit element. Remedy: Check for noise or hardware damage. Turn off the inverter power. |
| E30 IGBT error | Cause: Instantaneous overcurrent occurred, main circuit element temperature is abnormal, or drive power dropped. Remedy: The inverter cannot retry operation. Check for short circuits or hardware failure. |
| E35 Thermistor error | Cause: The resistance of the thermistor (in the motor) connected to the TH terminal indicates that the motor temperature rose. Remedy: Check motor temperature and cooling. |
| E37 Emergency stop | Cause: The EMR signal is turned on (when slide switch SW1 is ON), or malfunction due to noise when EMR terminal is not ON. Remedy: Check EMR signal status and noise interference. Reset by turning on RS terminal (reset via digital operator not accepted). |
| E38 Low-speed overload protection | Cause: Overload occurred during motor operation at very low speed (0.2 Hz or less). Remedy: Check load conditions at low speed. |
| E41 Modbus communication error | Cause: Timeout occurred due to line disconnection during Modbus-RTU communication. Remedy: Check communication lines and timeout settings (C076). |
| E60 to E69 Option 1 error | Cause: The inverter detects errors in the option board mounted in optional slot 1. Remedy: Refer to the instruction manual for the mounted option board. |
| E70 to E79 Option 2 error | Cause: The inverter detects errors in the option board mounted in optional slot 2. Remedy: Refer to the instruction manual for the mounted option board. |