UPS - Knowledgebase. What is a Manual Hard Bypass Switch and why are they necessary? UPS installations often include a manual wrap-around hard bypass switch, also referred to as maintenance bypass switch, or MBS. The manual bypass switch allows the UPS to be de-energized without interrupting power to the critical load.
The manual bypass switch provides a safe easy means for a trained service technician to perform routine maintenance, inspections and repairs to the UPS. This is done by manually transferring the load to the bypass power source using a make-before-break switch or breakers. Once the UPS is successfully serviced, the load can be safely transferred back without any power interruption. All manual hard bypass switches must be operated in the correct sequence or loss of load and damage to the UPS can result.
What are the differences between an internal and external manual bypass switch? Rotating the switch from normal to bypass will connect the load directly to the bypass power source allowing the UPS to be shutdown for maintenance.
Once maintenance is completed the bypass switch is rotated back to the normal position reconnecting the critical load to the conditioned UPS power source. Pros: The UPS can be easily bypassed and shut off for servicing by following the correct sequence. The UPS is not totally isolated from the AC power source and cannot not be physically removed or replaced without interrupting power to the load. Commonly, the separate enclosure is wall mounted or in a matching sidecar cabinet to the UPS.
Similar to the internal bypass switch, the UPS load can be seamlessly transferred between the UPS and bypass power source. This allows the UPS to be de-energized for service and even physically removed or reinstalled without interrupting power to the critical load. External rack mount manual bypass switches are typically used on UPS and Inverters that are designed to also be mounted in racks. All internal components are de-energized.Transitioning Galaxy VM UPS into Maintenance Bypass - Schneider Electric Support
This is the most desirable bypass configuration for service accessibility and safety. Manual Bypass Switches.An uninterruptible power supply is an in-line power protection device that sites in the critical power path from your mains building incomer to your power distribution points.
As such it is imperative that the UPS system can be bypassed without disruption to any connected loads. Uninterruptible power supplies come in three different design topologies that are classified as standby, line interactive and on-line double-conversion. On-line UPS are the most popular for critical power protection and incorporate a built-in automatic bypass.
A sensing circuit monitors the output waveform of the UPS and compares this to a sinewave. If the output waveform is seen to distort due to an overload condition or a failure within the UPS itself, the load is automatically transferred to the bypass supply normally connected to the mains power supply.
The UPS automatic bypass may be relay or static switch based.
In a relay-based transfer switch there may be a short break in supply as the load is transferred from the output of the UPS to the mains power supply. The most common type of UPS maintenance bypass is the static switch variety. The rela-based bypass is a cheaper alternative and can be found in smaller on-line UPS systems sub 1. Three phase and some smaller UPS systems will also incorporate a maintenance bypass switch. The switch will be breaker based and must be manually pushed into position to activate.
In maintenance bypass, the UPS can be safely serviced and inspected, though the system itself still has live components and the load is powered through the UPS and connected mains power supply. When the UPS service is completed, the maintenance bypass switch can be used to put the UPS back into full on-line protection. An external bypass can also be installed. This is a separate box normally wall or rack mounted and connected to both the UPS input and output supplies. The bypass is manually activated and when the output is switched to bypass, the load is supplied directly from the raw mains power supply.
In bypass mode, the UPS can be safely powered down without interruption to the connected loads and removed for UPS service work or swapped out. When the operation is completed and the UPS reconnected the bypass can be turned or switched to put the load back onto UPS output.
External maintenance bypass switches are commonly used with UPS systems in critical power protection installation as they prevent downtime and the need to power down connected loads servers and comms systems.
Home UPS Systems. A bypass switch is a non-essential addition to an uninterruptible power supply system that, while not integral to UPS operation, is definitely useful in the event of maintenance or repair. The core items you need in order to be protected in the event of power failure are a UPS and a battery to supply the power, under standard operation this should be all that is required. However, if there is a fault or you need to remove a unit for repair, a bypass switch ensures that power continuity is maintained in the event of a failure.
You can find our range of UPS Bypasses here. A maintenance bypass switch of the external variety will need to be bought separately in most instances and fitted by one of our technicians. If your electrical systems are mission-critical, for example in manufacturing or healthcare, we will likely advise fitting an external switch when you first purchase your UPS system and which product is the best fit for your needs.
Our strength lies in our ability to work with you to determine your exact needs for power protection for both now and in the future, and then create a bespoke solution to match your needs and your power strategy in the future.
As a UPS Systems customer, you can be assured of the greatest level of service during planning, installation and commissioning of your project as well as being provided with the best level of after-sales care available.
Static Bypass is the line which effectively joins the input supply to the output and continues to support the load without going through the UPS system. A properly designed system should enable this to be performed without loss of power to the load. A manual bypass switch is used to remove the UPS system from the circuit for servicing or maintenance or if it is no longer working correctly.
An automatic transfer switch functions in the same way as a manual, but will also switch the UPSs load to mains electric automatically if the UPS experiences an internal failure. As a static inverter is a more specialised version of a UPS system it works the same way, the Bypass switch allows a static inverter system to be bypassed if there is an issue or maintenance is required. Total Harmonic Distortion THDi is a measurement of the harmonic distortion and is the ratio of the sum of the power of all harmonic components to the power of the fundamental frequency.
THDi is also used to characterise the power quality of electric power systems and the linearity of audio systems. There are two main types of bypass switch that serve similar but distinct functions. These are the static bypass switch and the external maintenance bypass switch. UPS Repair. Remote Monitoring. Battery Replacement.
Generator Installation. Load Bank Testing. Impedance Testing. Site Survey. Micro Data Centre. Edge Data Centre. Modular Data Centre. Industry 4. Internet of Things. Design and Build. Air Conditioning. Fire Suppression. Server Racks.The operation is fairly simple. The output from the UPS is then connected to another switch UPS Output and the output of this feeds the load with a secondary connection feeding the output of the Bypass Switch.
Although this sounds confusing if you follow the red lines on the bypass panel above you should be able to figure it out. Although this layout has three switches, other configurations are available with a single switch with usually 3 positions — Normal, UPS Bypass, Bypass. When we want to bypass the UPS then this is simple.
We just turn the bypass switch from off to on — right? Wrong, very wrong. Because then what happens is the input mains supply is now directly connected to the UPS output which usually results in a destroyed inverter and a popped fuse with the resultant drop in load power that we were trying to avoid in the first instance.
Now you may think this is obvious but it does happen as — in the example above — there are no warnings on the panel, and particularly with single switch panels there can be an assumption that there is some sort of safety guard — there is not!
Sometimes you do this by switching the unit off and it automatically bypasses. Sometimes you need to turn a breaker on the back of the unit. Once the UPS is in bypass, you can then safely turn the bypass switch on the box from off to on.
Then you can switch off the input and output breakers. Load is now provided with power directly from the mains and the UPS has no power feeding it.
The UPS can be taken out of circuit for service. The first one is obvious. If you get a power disturbance whilst in bypass the UPS is not offering the load any protection.
This of course can result in downtime. When bringing a unit up from bypass there is the pitfall of an in-rush current tripping the supply fuse. This is more prevalent when the unit has an isolation transformer fitted and the electrical supply circuit breaker is not a Type C or D breaker. However a trip has happened to me on several occasions with transformerless products. What transpired is the internal capacitors were fully discharged resulting in a current spike during switch on, which although limited through a start up protection circuit was still high enough to trip a sensitive breaker.
For these scenarios a hot tip is before applying power to the UPS, start it up from battery. This charges up the capacitors internally. You can then switch off and quickly reconnect power to start up or allow the unit to synch with the incoming supply. In any event the bypass procedure must be undertaken with absolute care, and site users must be aware that any bypass operation is not foolproof and there is always the risk of downtime, particularly during power down and power up moments.
Ok Read more.Your list of items surely helped. This is an oustanding article. Does anyone know how exactly to create an ad like number 20. One of the most comprehensive I have read on the subject of FB marketing, Bravo. All great tips at one place. Can you shed some light on fb page verification process and how to make fb do it fast.
This is really helpful. Can you please help me. SIncerely,Bryan Your tips on FB promotion has been very very insightful. I just lauched a FB page and would need this great ideas to engage with my audience. Really helpful informaion for a newbie like me.
About to a FB advt, but cancelled it to read some tips beforecreating my first advt. Now I can create the ad.
Interesting post, but you seem to be missing a really big part of the picture. Every time you promote a post Facebook changes your pricing structure, charging you more to reach the same amount of people. Am sure i will try all these, facebook is not an easy one to use for marketing.
Can't wait to share this with my son that is just beginning a face. Glad to have found your post and i will try all of them to see which works. I am working with a couple partners openign a start up. We are looking to advertse on facebook. This list has given me some great tips and ideas going forward. Great insights, refreshing read. In this post, we'll be covering. Page Likes are a safe place to start in Facebook marketing.
Promote a deal to Facebook users with Facebook Offers 4.Flatline performs type inference, and will in general figure out the proper optype for the generated fields, which are subsequently summarized by the dataset creation process, reaching then their final datatype (just as with a regular dataset created from a datasource).
In case you need to fine-tune Flatline's inferences, you can provide an optype (or optypes) key and value in the corresponding output field entry (together with generator and names), but in general this shouldn't be needed. Samples Last Updated: Monday, 2017-10-30 10:31 A sample provides fast-access to the raw data of a dataset on an on-demand basis.
When a new sample is requested, a copy of the dataset is stored in a special format in an in-memory cache. Multiple and different samples of the data can then be extracted using HTTPS parameterized requests by sampling sizes and simple query string filters.
That is to say, a sample will be available as long as GETs are requested within periods smaller than a pre-established TTL (Time to Live). The expiration timer of a sample is reset every time a new GET is received. If requested, a sample can also perform linear regression and compute Pearson's and Spearman's correlations for either one numeric field against all other numeric fields or between two specific numeric fields.
You can also list all of your samples. You can also use curl to customize a new sample with a name. Once a sample has been successfully created it will have the following properties. Through the status field in the sample you can determine when the sample has been fully processed and ready to be used.
Thus when retrieving a sample, it's possible to specify that only a subset of fields be retrieved, by using any combination of the following parameters in the query string (unrecognized parameters are ignored): Fields Filter Parameters Parameter TypeDescription fields optional Comma-separated list A comma-separated list of field IDs to retrieve. A sample might be composed of thousands or even millions of rows.
Thus when retrieving a sample, it's possible to specify that only a subset of rows be retrieved, by using any combination of the following parameters in the query string (unrecognized parameters are ignored). BigML will never return more than 1000 rows in the same response. However, you can send additional request to get different random samples. Filtering Rows from a Sample Parameters Parameter TypeDescription.
As with inclusion, it's possible to include or exclude the boundaries of the specified interval using square or round brackets Example: ".
Understanding UPS Maintenance Bypass Arrangements
One of the limits can be omitted. This can be useful, for instance, when you're performing various GET requests and want to compute the union of the returned regions. You'll want this only when unique is set to true, otherwise all those extra values will be equal to 1.
When index is also set to true (see above), the multiplicity column is added after the row index. Useful when paginating over the sample in linear mode.
Once you delete a sample, it is permanently deleted. If you try to delete a sample a second time, or a sample that does not exist, you will receive a "404 not found" response.
However, if you try to delete a sample that is being used at the moment, then BigML. To list all the samples, you can use the sample base URL. By default, only the 20 most recent samples will be returned. You can get your list of samples directly in your browser using your own username and API key with the following links.
You can also paginate, filter, and order your samples.We have unfinished business here. This city has a well-known magical influence on Muscovites. Espresso Martini Fest, London Aug 10-12 (DrinkUp. Just like our other festivals, all you need to do is grab a. Wait, that would be too embarrassing going back to.
London Mezcal Week, Sept 11-17th (Drinking Trends) We love Mezcal, and so should you. Well besides being the most characterful, most artisanal, and most interesting spirit out there, Mezcal is a whole heap of fun. Moscow Bar Show, 05-07 Sept, St Petersburg (Moscow Bar Show) We are the Moscow Bar Show, and we are staying in St. Close Window Loading, Please Wait.
To provide access without cookies would require the site to create a new session for every page you visit, which slows the system down to an unacceptable level. In general, only the information that you provide, or the choices you make while visiting a web site, can be stored in a cookie. For example, the site cannot determine your email name unless you choose to type it.
Allowing a website to create a cookie does not give that or any other site access to the rest of your computer, and only the site that created the cookie can read it.
Beware Maintenance Bypass Switches. What you need to know.
Since the launch of the Shell Optimax brand in 2001, the use of premium fuels has grown and they now account for a significant part of European fuel sales in selected markets.
Fuel retailers are interested in differentiated fuel offerings. This brief examines the penetration of premium petrol and diesel in key European markets and reviews the major premium fuel providers.
An overview of the leading premium fuel brands and their availability, both in terms of site numbers and as a proportion of total company sites.
Premium fuel penetration by market, in volume terms and as a proportion of total petrol and diesel sales. Information on the main promotional activities and marketing campaigns of the key premium fuel retailers. Predictions on the penetration of premium petrol and diesel volumes across selected European fuel markets to 2010.
Although most major oil companies in Europe have a premium fuel offering, the proportion of their service stations selling premium fuel varies. Oil companies have led focused marketing campaigns to encourage the consumption of premium fuels. Marketers do not use the same message for premium petrol and premium diesel. Environmental protection is the core marketing message of premium diesel promotions whilst improved engine care is the core marketing message of premium petrol promotions.
The penetration of premium fuels varies greatly by market. Measure the availability of premium fuel brands across Europe, both in terms of total site numbers and proportion of company sites. Uncover the core marketing messages and channels used by retailers to promote premium fuels.