Marantec MDF-D400 Emergency Hand Crank Kit

The Marantec MDF-D400 Emergency Hand Crank Kit (KU) is a manual emergency operating accessory designed for MDF series industrial door operators, including models in the ~400 Nm torque class (e.g. D400 range).

It enables direct manual operation of the door via a crank handle when:

• Power supply fails
• Control system faults occur
• Maintenance or commissioning is required

This system is primarily used on:

• Springless sectional doors
• Industrial roller shutter doors

Marantec specifies that MDF operators support “emergency operation via emergency hand crank ‘KU’ (1-sided or 2-sided)”

Key Features

• Manual crank operation (KU system)
• Designed for MDF industrial operators (incl. D400 torque class)
• Enables direct mechanical drive of gearbox shaft
• Available in:
  • 1-sided crank (standard)
  • 2-sided crank (KU-KU) for larger systems
• Compact, space-saving design (mounted directly on operator)
• Can be converted to hand chain (KE) if required

Technical Specifications

(Consolidated from MDF series + D400 class configurations)

How It Works

• The crank connects directly to the gearbox input shaft
• Turning the crank:
  • Rotates the worm gear
  • Drives the door shaft
  • Opens or closes the door manually

Unlike chain systems:

• Requires operator access (not ground loop)
• Provides more direct torque control

KU (Crank) vs KE (Chain)

Marantec confirms both systems are standard emergency options for MDF drives

Typical Applications

• Industrial roller shutter doors
• Springless sectional doors
• High-cycle industrial installations
• Compact installations where chain drop is not practical

Safety & Functional Notes

• Used only when:
  • Power is off
  • Operator is disengaged or safe to operate
• MDF systems include:
  • Integrated safety catch (anti-drop)
• Requires:
  • Proper training for safe manual operation
  • Awareness of door weight (especially springless systems)

System Integration

The MDF-D400 Emergency Hand Crank Kit is typically:

• Supplied factory-installed or as an option
• Matched to:
  • MDF operator size (e.g. 220 Nm, 420 Nm variants)
• Compatible with:
  • AWG (encoder) or MEC (limit switch) systems
  • CS control units