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Loveton Circle P.O. Box 1155 Sparks, Maryland 21152 |
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FAQ List of frequently asked questions:
- Which nominal pressure is required for JDN Air Hoists?
- In which areas can JDN Air Hoists be operated?
- Which duty cycles have JDN Air Hoists?
- How many starts and stop with full load are permitted?
- What is the operational temperature?
- What are the benefits by using air hoists?
- How are JDN Air Hoists protected against overload?
- Which protection class have JDN Air Hoists?
- How does the JDN Vane Motor work?
- What to do in case of malfunctioning?
- Which hoist is suitable for my application?
- How to identify a spare part?
- How can I classify gases and vapours to Explosion Groups and Temperature Classes?
- How to compare UL Division System and ATEX Zone System?
- What does the EX-Marking on JDN Hoists mean?
- What do zones 0, 1, 2 and safe area mean?
- How to order spare parts?
- More help required?
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, Winches 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)
- JDN Air Winches Profi Lifter 1200/2000 and Profi Puller 1800/3000 in Standard Versions: EX II 2 GD IIA T4(X) / EX II 3 GD IIB T4(X)
- With increased spark protection (For these versions harnesses with special corrosion protection are available. The rope-end fastenings for the load hook and the load hook itself are copper-plated, the rope is galvanized and compressed): II 2 GD IIB T4(X)
- JDN Air Winches Profi Lifter 500/800: 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?
This
Animation
visualizes how we get our air hoists to move.
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 |
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 |
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( ): 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:
- Likelihood of presence in an area of explosive gas atmosphere when equipment is under operation
- Ignition related properties of explosive gas atmosphere
- Maximum surface temperature under normal operating conditions of equipment
- 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@jdn.de
enabling us to improve our FAQ chapter.
Your JD NEUHAUS Team