Hitachi SJ100 SERIES Service Manual page 14

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(4) Over voltage (E 07)
Phenomena:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Way to Reset:
(5) Under voltage (E 09)
Phenomena:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Way to Reset:
(6) EEPROM error (E 08)
Phenomena:
Abnormal situation occurs at the memory portion of the frequency inverter due to
incoming noise etc..
Cause:
Remedy:
Cause:
Remedy:
Over voltage at DC bus line of the frequency inverter.
Mains voltage too high, mains voltage fluctuation or rapid mains voltage return
(choke energy leads to voltage increase).
Make sure that mains voltage is within tolerance limits.
In case SJ100 is used in combination with a regenerative braking unit(ISPM)/
resistor but the regenerative braking unit(ISPM)/resistor does not function.
Replace regenerative braking unit(ISPM)/resistor.
In case SJU100 is used in combination with a raking resistor but the braking
resistor cannot absorb the regenerative energy.
Re-calculate and use suitable braking resistor.
Deceleration time is too short.
Make deceleration time longer, use braking unit (resistor), use bigger capacity of
frequency inverter.
A
Under voltage at DC bus line of the frequency inverter.
The mains voltage is not available or not within the tolerance limits.
Check all 3 (or 2) mains power supply voltage that it is within its specification.
Thyristor for smooth charging is defect and DC bus voltage drops while operation
due to current flows through smooth charging resistor.
Change ISPM.
Period of instantaneous power failure is longer than the set value [b02], or DC bus
voltage go down to its detecting level while instantaneous power failure.
Get rid of the instantaneous power failure, evaluate the power supply system, set
bigger value for [b02].
One of the AC voltage is missing (applied only for 3 phase INV)
Check AC line voltage , check the fuses.
A
Influenced by Electrical Magnetic Interference.
Keep such noise source away from the frequency inverter.
Ambient temperature is too high.
Take countermeasure against high ambient temperature.
3-3

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