Scope of this technical record
Evidence package for SJ300 / L300P E07 overvoltage, braking resistor, BDU and DC-bus sensing repair or replacement decisions.
Evidence around DC-link and braking hardware must be collected only after isolation and discharge verification by qualified personnel.
Hitachi E07 evidence package
The package turns a vague E07 report into settings, braking-system, repair or replacement evidence.
What makes an E07 support request actionable
An actionable E07 request identifies the machine event, the load behaviour, the installed braking route and the exact drive hardware. Without those details, the answer is usually guesswork: increase decel time, add a resistor, repair a board or replace the drive.
This record is designed to prevent that. It asks for the evidence that separates a settings change, resistor upgrade, braking-unit repair, bus-sensing repair or full replacement decision.
Field record checklist
- Model and voltage class
- E07 timing
- Line voltage
- Load/ramp evidence
- Resistor/BDU evidence
- Board labels and history
Technical basis and reference documents
This is an independent editorial technical reference. Original manufacturer documentation remains controlling for installation, repair and commissioning decisions.
Defines the status-at-trip context and links E07 to DC-bus overvoltage evidence.
Lists E06 braking resistor overload and E07 overvoltage protection caused by regenerative motor energy.
Shows that braking capability, resistor value, duty cycle and external braking units vary by rating.
Describes overvoltage detection by regenerated motor energy or high incoming AC voltage and highlights BRD-duty context.
Linked circuit records
Routes E07 overvoltage cases through machine energy, stop timing, ramp profile, descending or overhauling loads and DC-bus rise before the brake unit or sensing path is blamed.
Maps the braking-unit and resistor evidence needed when E07 follows deceleration: built-in BRD or external braking unit, resistor value, thermal switch, wiring, duty cycle and stop conditions before repair.
Defines the repair boundary after line, load and braking evidence are closed: DC-link measurement, bus feedback divider or sensing route, control board interpretation and conditions where a used board or replacement drive becomes the better decision.
Turn this record into a qualified service request
A repair decision is much more reliable when the request includes the exact identity of the drive, the first fault evidence and the machine condition when the symptom appeared.
- Complete drive type code / MLFB or nameplate model
- Fault code, fault value and first event before reset
- When the event appears: power-up, enable, ramp, run, decel or stop
- Motor/cable connected or isolated during the symptom
- Visible board, option-card, module and connector identifiers
- Previous repair history, replacement parts and repeat-failure pattern