Marantec MDF-D400 Hand Chain Mechanism MDF 30

The Marantec MDF-D400 Hand Chain Mechanism (MDF 30 – KE) is a manual emergency chain-drive system designed for MDF series industrial operators, particularly within the MDF 30 platform (≈300–420 Nm torque class, including D400 variants).

It provides ground-level manual operation via a continuous loop chain, allowing safe door control when:

• Power supply fails
• Electrical faults occur
• Maintenance or commissioning is required

This system is commonly referred to as “KE” (Kettenbetrieb – chain operation) and is a standard manual override option in MDF industrial drives.

Key Features

• Emergency hand chain mechanism (KE)
• Designed for MDF 30 series industrial operators (incl. D400 class)
• Enables floor-level manual operation
• Continuous loop chain for easy handling
• Can be converted from crank (KU) to chain (KE)
• Integrated safety interlock during manual operation
• Suitable for heavy-duty industrial doors

Marantec confirms MDF operators support:

• “Emergency operation via… hand chain ‘KE’” and easy conversion from crank to chain

Technical Specifications

(Based on MDF 30 / D400 operator configurations)

How It Works

• A chain wheel mechanism is integrated into the gearbox
• Pulling the chain:
  • Engages manual override
  • Rotates the worm gear
  • Moves the door shaft directly
• Electrical operation is typically interlocked/disabled during manual use

This allows full mechanical operation from ground level, even on large doors.

KE (Hand Chain) vs KU (Crank)

Typical Applications

• Industrial roller shutter doors
• Large sectional doors
• Warehouses and logistics facilities
• High-cycle industrial environments

Especially useful where:

• Operator is mounted high
• Frequent manual override may be required

MDF systems explicitly support “floor level hand chain system” for industrial use

Safety & Functional Notes

• Includes safety interlock switch during manual operation
• Works with:
  • Integrated safety catch (anti-drop system)
• Ensures:
  • Controlled movement of heavy doors
  • Safe operation during power outages

System Integration

The MDF 30 KE hand chain mechanism is:

• Factory-installed or optional on MDF operators
• Integrated with:
  • Worm gear transmission
  • Limit systems (AWG encoder or mechanical limits)
  • CS control units

Compatible across:

• MDF 30-30-12 (≈300 Nm)
• MDF 30-40-24 (≈400 Nm)
• MDF 30-42-12 (≈420 Nm / D400 class)

(The Company reserves the right to amend product specifications and information without notice.)