- closed loop vs. open loop vs. hybrid technology
- sinking vs. sourcing I/O
- load to rotor inertia ratio
IP ratings: the true letter of the law!
- 1st position solid objects or materials
- 2nd position liquids (water)
- 3rd position mechanical impacts (commonly omitted as not part of IEC 60529)
|Level||Object size protected against||Effective against|
|0||—||No protection against contact and ingress of objects|
|1||>50mm||Any large surface of the body, such as the back of a hand, but no protection against deliberate contact with a body part|
|2||>12.5mm||Fingers or similar objects|
|3||>2.5mm||Tools, thick wires, etc.|
|4||>1mm||Most wires, screws, etc.|
|5||Dust protected||Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity to interfere with the satisfactory operation of the equipment, complete protection against contact (dust proof)|
|6||Dust tight||No ingress of dust, complete protection against contact (dust tight)|
|Level||Protected against||Testing or||>Details<>|
|1||Dripping water||Dripping water (vertically falling drops) shall have no harmful effect||Test duration 10 minutes. Water equivalent to 1mm rainfall per minute|
|2||Dripping water when tilted up to 15°||Vertically dripping water shall have no harmful effect when the enclosure is tilted at an angle up to 15° from its normal position||Test duration 10 minutes. Water equivalent to 3mm rainfall per minute|
|3||Spraying water||Water falling as a spray at any angle up to 60° from the vertical shall have no harmful effect||Test duration 5 minutes. Water volume: 0.7 liters per minute. Pressure 80-100kPa|
|4||Splashing of water||Water splashing against the enclosure from any direction shall have not harmful effect||Test duration: 5 minutes. Water volume: 10 liters per minute. Pressure 80-100kPa|
|5||Water jets||Water projected by a nozzle (6.3mm) against enclosure from any direction shall have no harmful effects||Test duration: at least 3 minutes. Water volume: 12.5 liters per minute. Pressure: 30kPa at distance of 3m|
|6||Powerful water jets||Water projected in powerful jets (12.5mm nozzle) against the enclosure from any direction shall have no harmful effects||Test duration: at least 3 minutes. Water volume: 100 liters per minute. Pressure: 100kPa at distance of 3m|
|7||Immersion up to 1m||Ingress of water in harmful quantity shall not be possible when the enclosure is immersed in water under defined conditions of pressure and time||Test duration: 30 minutes. Up to 1m of submersion (condensed description)|
|8||Immersion beyond 1m||The equipment is suitable for continuous immersion in water under conditions which shall be specified by the manufacturer. However, with certain types of equipment, it can mean that water can enter but only in such a manner that it produces no harmful effects||Test duration: continuous immersion in water. Depth specified by manufacturer, generally up to 3m|
What IP means for my application
You will want to consider if the motor will:
- be used outdoors?
- need to be fully submerged?
- be subjected to wash down conditions?
IP65 rated motors:
- are not certified for outdoor applications, without additional protection from the elements.
- are not fully water submersible.
- are not food grade, with wash-down requirements.
Integrated motors with IP65 rating
- Packaging applications where various materials are being conveyed.
- Form, fill, and seal machines where product is being dispensed and sealed.
- Liquid dispensing and pumping applications in medical devices and life science.
- Printing and labeling machines, especially barcode and 2D label applications for track and traceability in the medical device and life science areas.
- 3D printing systems.
- Machine tool opportunities that could include water jet cutting, laser cutting, tool changers, etc.
- Assembly and test systems with three and four axis pick and place gantry.
- Hydraulic and pneumatic cylinder replacement.
Testing to ensure IP65 protection
Let’s review!In the lines above we have covered what IP ratings mean for protection levels and testing criteria. We have also, more importantly, covered what ratings do not mean in the case of IP65. Applying an IP-rated motor in a system is no different than applying a non IP-rated motor, as both require the correct fit for the application to operate successfully. IP ratings do not negate the need for consideration of the environment in which the device will be applied, including the possibility of additional protection. Exercising their grey matter to understand IP ratings, engineers can make intelligent design decisions. Good decisions, such as selecting appropriately rated devices, result in applications operating as expected in specified environmental conditions.
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