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Prepared for Extremes

FAQ - List of frequently asked questions back

Which nominal pressure is required for JDN Air Hoists?

JDN Air Hoists work at a nominal pressure of 6 bar (85 psi). The hoists are designed in such a way that the full load can be lifted at 5,4 bar (76,5 psi) that a possible loss at the hose is compensated. On request special version for 4 bar (58,02 psi) are available.

In which areas can JDN Air Hoists be operated?

JDN Air Hoists and cranes are - contrary to electrically operated - suitable for application in hazardous areas as the driving medium air opposite to electricity does not produce any sparks.

  • JDN Air Hoists and Crane Standard Versions:
    EX II 2 GD IIA T4(X) / II 3 GD IIB T4(X)
  • With increased spark protection (bottom block and load hook are copper plated by galvanisation; brass safety catch): EX II 2 GD IIB T4(X)
  • With increased spark protection for explosion group IIC (additionally the running wheels of trolleys and travelling gears are made of bronze): EX II 2 GD IIC T4(X)
  • JDN-Air Hoists of the Economy Line mini: EX II 3 GD IIA T4(X)
Which duty cycles have JDN Air Hoists?

JDN Air Hoists are working with air as supply medium. The air at a working pressure of appr. 6 bar (85 psi) is expanded in the motor. The expansion of air leads to a decrease of the air temperature, which cools the motor. On the latest generation of the PROFI and mini series the air flows through channels within the gear box and so also the gear train is cooled.
Due to this feature there is no down time and the rating is 100% duty cycle instead of electric hoists.

  • No limits with reference to operation time (100% ED)
  • Ideal for large lifting heights
How many starts and stop with full load are permitted?

There is no limitation in starts/stops per hour.

What is the operational temperature?

Air hoists are insensitive with respect to high and low temperatures (70°C at motor, 150°C on chain and hook).

What are the benefits by using air hoists?
  • True vertical lift on all sizes
  • Easy handling
  • Accurate speed control with high torque
  • Low weight compared to electric hoists
How are JDN Air Hoists protected against overload?

JDN Air Hoists PROFI comply the machine directive and therefore have an overload protection on all products with SWL´s starting from 1000 kg. The sophisticated control ensures that in case of overload the hoist stops. To unlock the stopped hoist it has to be lowered by the pendant control to release the latched overload device.

  • The pneumatic motor simply stops without any damage·
  • No overheating in stall torque or jamming
  • No special protection facilities like PTC elements required
  • With pneumatics, for short term pressure can be increased within the maximum load of the hoist (not allowed for normal use)
Which protection class have JDN Air Hoists?

On electric equipment the compartment or case is classified according to IP or NEMA. For example means IP 68 a housing safe against dust ingress and submersible for a certain time acc. to manufactures specification.
An Air Hoists is an open system which is by nature sturdy and insensitive against dirty, aggressive and humid environment. The supply air blows out any ingress. So this makes the air hoist a unique and reliable tool in harsh environment and incomparable to electric hoists.

How does the JDN Vane Motor work?
What to do in case of malfunctioning?
Fault Possible cause Remedy
Lifting not possible Overload protection has shut off Lower hook briefly, limit load to permissible load carrying capacity, then lift again
Air pressure too low Increase air pressure to the required value
EMERGENCY STOP switch is pressed When the danger has passed, release the EMERGENCY STOP switch
Hand control is faulty Have hand control repaired
Only very slow lifting is possible Brake does not release fully Set air pressure to the relevant value, Check seal of brake piston and change seal if necessaryCheck the adjustment of the brake piston (see spare-parts-list)
Brake lining worn or uneven Replace brake lining
Motor cover bolts loose Tighten bolts
Air supply hoses are leaking or loose Check connections of air supply hose and control hoses and connect properly
Cross section of air line too small Use air line with sufficiently large diameter (check air pressure)
Dirt in the service unit
*Filter blocked
Clean the service unit, ensure better air quality
Silencer is clogged Replace the silencer elements or clean, improve air quality if necessary
Motor vanes worn Replace motor vanes
Motor has run dry Lubricate motor, Check oiler*
Control valve on motor Have the control valve repaired
Excessive running on during braking Brake disc and/or brake piston Replace brake disc and/or brake piston
Loud chain noise at chain sprocket Chain dry
Chain worn
Lubricate chain
Replace chain with new JDN chain
Chain sprocket worn Replace chain sprocket, check chain guide, replace if necessary
Wrong chain drawn in Identify chain and replace with JDN chain if necessary
Lifting or lowering speed reduced at higher lifting heights or motor comes to a standstill Adjustment of brake piston too tight Correct adjustment of brake piston. At high ambient temperatures perform adjustment with the device warmed up accordingly

*if available

Which hoist is suitable for my application?

The mini widens the range of application in the light duty sector as a handy, flexible and universally deployable hoist making it an ideal tool for the most different handicraft workshops. Carrying capacities: 125 kg up to 980 kg

JDN Air Hoists PROFI Series are very robust and therefore suitable for tough industrial applications even in continuous working processes. According to requirement there are various control systems. For traversing loads there are different trolleys to meet your special demands.Carrying capacities: 250 kg up to 100 t

JDN Air Hoists M and B series are designed for operating in mines.

How to identify a spare part?

Take the according spare part list of your product and find the asembly for which the spare is required.On the bottem left of the page you will find a spare part drawing number.Inside the spare part drawing chapter you will find the referenced drawing helping you to identify the required spare part.

How can I classify gases and vapours to Explosion Groups and Temperature Classes?

The table gives you a short overview acc. to ATEX. Please refer to your operation manual and relevant standards for more information.

ExGroup Temperature class
T1 T2 T3 T4 T5 T6
ignition temperature
> 450°C 450-300°C 300-200°C 200-135°C 135-100°C 100-85°C
Maximum admissible surface temperature of the operating devices
450°C 300°C 200°C 135°C 100°C 85°C
II A Acetone
Ammonia
Aniline
Benzole
Benzol
Chloride
1,2-Dichlor
Benzole
Acetic Acid
Natural Gas
Ethane
Ethyl Acetate…
(Ethyl Alcohol)
(Ethylene Glycol)
i-Amyl Acetate
n-Butane
n-Butyl Alcohol
1-Butylene
1,2-Dichlorethane
Di-i-Propyl Ether
Natural Gas
Acetic Anhydride
n-Propyl Acetate
n-Amyl Alcohol
Benzine/Gasoline
Diesel Fuel
Heating Oil
n-Hexane
Jet Propulsion
Fuel
Acetaldehyd    
II B Cyan
Hydrogen
(Ethyl Bromide)
(Carbon Monoxide)
(Nitro Benzole)
City Gas
Butadiene-1,3
Dioxane-1,4
Divinyl Ether
(Ethyl Alcohol)
Ethylene
...
Dimethyl Ether
** Hydrogen
Sulphide
Ethyl Ether    
II C ** Hydrogen ** Acetylene       **Carbon
Disulphide

( ): The measured values for classifying the media in brackets into explosion group or temperature class are near the next group or class and are therefore mentioned in both.
**: media getting very easily into ingition
*1 (Methanol = Methylalcohol)

How to compare UL Division System and ATEX Zone System?

Both, Division and Zone System classify areas based on:

  1. Likelihood of presence in an area of explosive gas atmosphere when equipment is under operation
  2. Ignition related properties of explosive gas atmosphere
  3. Maximum surface temperature under normal operating conditions of equipment
  4. Protection methods against possible ignition of surrounding atmosphere by use of electrical equipment
Comparison of area classification
Division Zone
Division 1:
Where ignitable concentrations of flammable gases, vapours or liquids can exist all of the time or some of the time under normal operating conditions
Zone 0:
Where ignitable concentrations of flammable gases, vapours or liquids can exist all of the time or for long periods of time under normal operating conditions.
Zone 1:
Where ignitable concentrations of flammable gases, vapours or liquids can exist some of the time under normal operating conditions.
Division 2:
Where ignitable concentrations of flammable gases, vapours or liquids are not likely to exist under normal operating conditions.
Zone 2:
Where ignitable concentrations of flammable gases, vapours or liquids are not likely to exist under normal operating conditions.
Comparison of ignition related properties of the explosive gas atmosphere:
Division 1 and 2 Zone 0, 1, 2
A (acetylene) IIC (acythelene & hydrogen)
B (hydrogen)
C (ethylene) IIB (ethylene)
D (propane) IIA (propane)
What does the EX-Marking on JDN Hoists mean?

All hoists are marked with the EX-Markings acc. to the ATEX standard.

What do zones 0, 1, 2 and safe area mean?

Acc. to ATEX every operator of a plant has to classify the hazardous areas of the plant into ZonesThe image illustrates simplified the zones of explosives atmospheres:

Zone 0
Permanent explosive atmosphere

Zone 1
Zone 1 hazardous area is classified as an area where an explosive atmosphere is likely to occur during normal operation. These conditions would be expected to be present for between 10 and 1000 hours per year.

Zone 2
In zone 2 hazardous area an explosive gas is not likely to occur during normal operation but if it should occur for some reason it would only exist for a short time. A potentially explosive atmosphere will occur for less than 10 hours per year.

Safe Area
Non hazardous area, no explosive atmosphere

How to order spare parts?

For correct handling of your spare part order the part number of the according spare part list is required. For us it is quite helpful to have the serial number of the hoist mentioned on the nameplate.

More help required?

If your question is not answered within the FAQ chapter please contact JDN or our local representative.
As we are trying to update this information for your further assistance kindly let us have your feedback at info(at)jdn.de enabling us to improve our FAQ chapter.
Your JD NEUHAUS Team

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