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2.2. General description
Figure 2-1
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Control switch
1) Control unit box
2) Rotor shaft
3) Motor
4) Housing
5) Brake
6) Electrical control
7) Transmission
8) Limit switch
The electric chain hoist meets the requirements of the EC Machinery
Directive and the relevant EN and FEM standards.
Housing and cover are made of a sturdy aluminum die casting. Fins on
the motor ensure optimum cooling. The chain box can be attached to the
compactly constructed housing. A drilled hole is provided for both the
power supply cable gland and the control cable. The lugs, or optionally
the suspension hooks, are attached to the flange ring.
Tractel electric chain hoists are driven by asynchronous motors. For two-
speed models a pole switching version of the motor is fitted.
The braking system consists of a DC-operated spring loaded brake.
When there is no current, the pressure spring generates the braking
torque.
For functional reasons, the slip clutch is installed in front of the brake
system and integrated into the rotor shaft. It protects the hoist from
overload and takes on the function of an emergency end stop for the
highest and lowest hook positions.
A gear-type limit switch is fitted to limit the highest and lowest hook
position. As an option, emergency stop contacts with positive separation
can be retrofitted downstream.
Electric chain hoists are fitted with a 42 V contactor control as standard.
The emergency stop contactor that is usually installed separates all three
mains power phases when the red button is pressed.
The high tensile Profile Steel Chain corresponds to grade DAT (8SS)
according to DIN EN 818-7. The chain wheel is hardened. The load hook,
which complies with DIN 15401, is fitted with a safety catch.
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The two-or three-stage, closed spur gear units are usually helically cut.
The gears are mounted on roller bearings and run greased.
The standard equipment fitted to the electric chain hoist includes a
control switch (up/ down with emergency stop).
3. Start-up
DANGER!
Mechanical adjustments may only be performed by authorised
specialists.
CAUTION!
Operating staff must carefully read the operating instructions of the
electric chain hoists before its initial operation and carry out all checks.
Only when safe operation has been established may the device be
put into operation. Unauthorised persons may not operate the device
or carry out work with it.
The operator must create an inspection pass when starting-up the
electric chain hoist. The inspection pass contains all the technical
data and the date of start-up. It provides a record of all servicing and
maintenance work.
3.1. Transport and assembly
The safety directions for handling with loads should be followed (see
chapter 1.3) when transporting and assembling the electric chain hoist.
Electric chain hoists must be assembled by qualified staff, always
bearing in mind the accident prevention directions in chapter 1.2. Before
assembly the electric chain hoist must be stored in an enclosed room or
covered area.
Should the electric chain hoist be destined for operation outdoors, then
it is recommended that a protection cover is erected to shield it from the
effects of the weather.
Wherever possible, the electric chain hoist should be transported in
its original packaging. The goods delivered should be checked for
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