Description
DH-AL-30K is a Mitsubishi Electric AC reactor (line reactor) used in CNC servo and spindle power supply systems.
Description
- Manufacturer: Mitsubishi Electric
- Series: DH-AL series (MDS-EH / MDS-DH compatible)
- Model: DH-AL-30K
- Type: AC Line Reactor (input reactor for CNC power supply)
- Rated Capacity: 30 kW class
Purpose / Function
This component is not a drive or inverter. It is a passive inductive device installed on the AC input side of CNC power systems.
It is used to:
- Reduce harmonic distortion from CNC converter units
- Limit inrush current when switching ON
- Protect the MDS power supply rectifier section
- Improve power factor and stabilize the electrical supply
- Reduce stress and heating in the system
Compatible Systems
From Mitsubishi CNC specifications, DH-AL-30K is matched with:
- MDS-EH-CV-300
- MDS-DH-CV-300
Electrical Ratings (typical)
- Rated current: ~110 A
- Voltage class: 380–480 VAC (3-phase)
- Frequency: 50/60 Hz
- Application: Input side reactor for CNC converter unit
System Position
AC mains → DH-AL-30K reactor → MDS-EH / DH CV power supply → DC bus → servo/spindle drives
Key Point
- It is a pure passive coil (inductor)
- It does not convert or control power
- Its job is protection + filtering + power quality improvement
If you want, I can also give you a full pairing chart (7.5K to 75K DH-AL vs MDS CV units) or explain how to check if this reactor is faulty in a CNC machine (overheating, trips, alarms, etc.)