Hitachi L100 SERIES Service Manual page 12

(2) Overload (E 05)
Phenomena: Overload of the inverter.
This error can be reset 10 seconds after the E05 came out.
Cause: Motor load is heavy.
Remedy: Reduce the load and/or increase thermal level and/or use bigger capacity of
frequency inverter.
Cause: V-Boost value is high.
Remedy: Reduce V-Boost value or increase thermal level and/or use bigger capacity of
frequency inverter.
Cause: Set wrong value for electronic thermal level [b12] and/or electronic thermal
characteristic [b13].
Remedy: Set suitable value.
Cause: Set wrong value for the reactive current of the motor.
Remedy: Set suitable value. Reactive current value which should be input by function mode
is a value measured at 50Hz (60Hz) without load.
Way to Reset: A
(3) Overvoltage (E 07)
Phenomena: Overvoltage at DC bus line of the frequency inverter.
Cause: Mains voltage too high, mains voltage fluctuation or rapid mains voltage return
(choke energy leads to voltage increase).
Remedy: Make sure that mains voltage is within tolerance limits.
Cause: In case L100 is used in combination with a regenerative braking unit but the
regenerative braking unit does not function.
Remedy: Replace regenerative braking unit.
Cause: In case L100 is used in combination with a raking resistor but the braking resistor
cannot absorb the regenerative energy.
Remedy: Re-calculate and use suitable braking resistor.
Cause: Deceleration time is too short.
Remedy: Make deceleration time longer, use braking unit (resistor), use bigger capacity of
frequency inverter.
Way to Reset: A
(4) Undervoltage (E 09)
Phenomena: Undervoltage at DC bus line of the frequency inverter.
Cause: The mains voltage is not available or not within the tolerance limits.
Remedy: Check all 3 (or 2) mains power supply voltage that it is within its specification.
Cause: Thyristor for smooth charging is defect and DC bus voltage drops while operation
due to current flows through smooth charging resistor.
Remedy: Change ISPM.
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