1. Total Alarm: The power unit has been stopped by any alarm factor.
Cause1: The power unit has been stopped with the emergency stop switch.
Cause2: A failure that stops the power unit has occurred.
2. Oil Temperature High: The hydraulic oil temperature is increased.
Cause1: No cooling water is flowing.
Cause2: A failure of the hydraulic oil cooler
Cause3: Deterioration of cooling tower capacity, or a failure of the cooling tower
3. Oil Level Low: The oil level in the PU oil tank is decreased.
Cause: Oil leak from the hydraulic piping