J. D. NEUHAUS PROFI 25TI, Original Operation And Assembly Instructions

Page: 20 / 72

powered by air!
Page 20
APPLICATION
APPLICATION
AREA OF APPLICATION
For permanent stationary outdoor operation, hoists must be
protected against weathering and the maintenance intervals must
be shortened.
ATTACHMENT POINTS
DANGER!
The attachment points for JDN Air Hoists must be
designed to safely withstand the expected forces.
Ensure that your JDN Air Hoist is capable of alignment
under load, otherwise inadmissible additional stresses
may occur.
DANGER!
The supporting structure of the air hoist must form a
rigid mounting. Vibration damages the chain and can
lead to chain fracture. Furthermore, external vibration
must on no account be transmitted to the hoist
(e.g. by the suspended load).
ENERGY REQUIREMENTS
For air pressure, air quantity and connections, see the table
Technical data, page 65ff.
Air pressure specifications
One of the ways in which JDN Air Hoists are identified is by the
nominal pressure (overpressure) indicated on the device. The
nominal pressure specification is intended to indicate a system
pressure (main air supply) of the same magnitude.
The system pressure of the main air supply applies to a connected
air host provided that it is not switched on. After switching on, the
system pressure drops to the actual pressure. The actual pressure
(operating pressure) changes, depending on the size of the load as
well as on the direction of the movement of the load (lifting and
lowering).
In addition, the actual pressure depends on the cross-
section and length of the hose.
For this reason, when calculating the performance of the air hoist,
we have allowed for a 10% drop in nominal pressure when lifting
the maximum load specified for the hoist.
Specifically: An air hoist designed for 6 bar achieves the specified
performance values at an actual pressure of 5.4 bar.
DANGER!
There is a risk of overloading when working with
system pressures exceeding 6 bar. The pressure
must therefore be limited to 6 bar.
JDN Air Hoists must be operated with a sufficiently clean and dry air
supply (it may be necessary to install an upstream air dryer to meet
these requirements).
Do not operate JDN Air Hoists with other gases (if necessary, check
with the manufacturer).
The air supply must fulfil the relevant quality requirements (see
Operating conditions, page 17).
If, as an alternative, the motor is lubricated by means of the air
supply, the following quantities of lubrication oil are required:
Oil content:
10 mg per m
3
air consumption.
The oiler, integrated in the upstream service unit in this case,
provides the required oil content in the air supply (see Service
unit, page 48).
When ambient temperatures at the operating site are at or
below 0°C and when the hoist is operated for longer periods
(e.g. several minutes) ensure that the air supply is not too
moist, otherwise there is a risk that the air lines, control valve,
motor and brakes will ice up.
You can prevent icing by installing an upstream air dryer. It may be
sufficient to feed lubricating oil with anti-icing additive (see
Lubricants, page 28) into the air supply (see Service unit, page
48).