4.3 Chain drive
The special Demag chain is of high strength ageing-resistant material with a high degree of surface hardening,
galvanised with additional surface treatment. The dimension tolerances of this chain have been precisely adapted
to the chain drive. We therefore urgently recommend that the Demag special chain be used to ensure safe operation.
The maximum service life of the chain can only be reached, if the specified regular lubrications are appropriately
carried out. When a chain is replaced, always the entire chain drive is replaced. For this purpose a chain set that
can easily be replaced is available.
The chain set offers the following benefits:
● the optimum duration of service is ensured for the chain;
● reliable decision for replacing the individual chain drive components;
● reduction in service costs by replacement in one installation process; it is not necessary to dismantle the motor
or the gearbox.
4.4 Housing
The housing of the chain hoist is of strong light-weight die-cast aluminium. The fan cover on the motor, the service
cover, the electrical equipment cover and the movable chain collector box are of particularly impact-resistant plastic
material.
4.5 Electrical equipment
4.5.1 Control
The chain hoist is provided with a 24-V contactor control system. The contactor control system is supplemented by
an electronic system with programmed functions. This electronic system detects the control commands that are
tripped by the operator with the control pendant. Permissible control commands generate switching commands for
the contactors to control the hoist motor. The electronic system monitors the control sequence specified by the
operator based on the speed feedback from the drive shaft, the operating limit switch contacts and, if applicable,
from the thermal contacts of the motor. In the event of any discrepancies, the chain hoist is automatically brought
to a safe status and warning or error messages are generated. The positively disconnected emergency stop contact
of the control pendant immediately opens the circuit for the contactor supply so that the motor is de-energized and
the brake is applied.
As standard, the control system features the following characteristics:
● Operating limit switch for lifting and lowering (DC-Com 1 - 10 reeving 1/1 optional, DC-Com 10 reeving 2/1 as
standard);
● Plug-type connections for control pendant, power supply, motor connection, brake, operating limit switches;
● Connection for the E 11 - E 34 trolley control system;
● 7-segment display for operating hours, operating status and error messages;
● Infrared interface for wireless transmission of service data;
● Replaceable contactor with socket for DC-Com 10.
● Signal transmission in steps with 24 V tri-state signals for controlled DC chain hoists (half-wave evaluation);
For manual control, Demag control pendants are connected via plug-in connectors. For Demag DC chain hoists
without electric trolleys, the compact DSC optimised for this application is used, the DSE-10C for applications with
electric trolleys.
For integrating the DC chain hoist in existing installations with contactor control, please note the information in the
brochure DC electrical accessories ⇒ Tab. 3, Page 7. For controlling pole-changing AC motors (with or without
brake) of cross and long travel units the Polu box with integrated contactor control is required, see brochure Elec‐
trical accessories Polu box ⇒ Tab. 3, Page 7.
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