Etap Soft Starter

[Liliane Hubright]

Asoft starter is a device used to reduce the load and torque in the powertrain of the motor during startup. Using a soft-starter reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the system. ETAP includes modeling of the following motor soft-starters:

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The key to achieving this is the use of certain components that allow the current flow to be controlled gradually in the different phases, usually a series of silicon controlled rectifiers (SCR), or thyristors.

This is the circuit in charge of controlling, monitoring and protecting the components of the power supply circuit, in addition to the user interface circuits that can be configured according to each application.

When a gate pulse (firing pulse) is applied to a set of thyristors, they open (ON) and allow current to flow to energize the motor in the corresponding phase. The angle of each pulse is what determines how much current can pass and for how long.

This ability of the thyristors to control the variation of the firing angle makes it possible to generate an effective voltage at the output that increases gradually and continuously until it reaches the nominal voltage of the network.

Both the angle of the firing pulse and the duration of the current flow are controlled by the user through the control circuitry by setting certain parameters to limit current flow. In this way is how soft starters:

However, the need to install a starter on a motor will depend on the characteristics of such a motor and its susceptibility to damage by receiving current and heat in excessive amounts during the starting phase.

Fans are often kept operational for long periods of time, but can also greatly benefit from a smooth, progressive starting phase to help extend their lifespan. This is especially important when the correct operation of a fan is key to preserving food or delicate pieces.

These types of pumps are often damaged due to the strong pressure that builds up in the pipes during starting and stopping. Soft starters can significantly reduce the risk of damage by allowing a controlled increase in pressure.

A sudden, rough start can put undue stress on conveyor or transmission belts and cause them to break or slip out of their guides. A smooth start can ensure that the straps stay in place and last longer, as well as protect the items being carried and other pieces.

This 3-phase asynchronous motor starter finds applications for fan, pump, compressor, ball mill, and crusher motors, among others. This allows it to find applications in fields as diverse as metallurgy, petroleum, fire, mining, water supply, municipal, food, cement, petrochemical, etc.

Soft starters are control and protection devices that can significantly reduce the chances of malfunctioning of motors and various machinery by protecting them from sudden voltage surges and overheating, thus helping to significantly increase the lifespan of these devices.

CHINT soft starters have been designed for flexibility and scalability, as well as offering additional built-in features and functions that will allow you to reduce your energy and maintenance costs. Find out the high-quality products that CHINT can offer you here.

The entire process takes less than a minute. At this point if you press the shift buttons on either shifter, it should cause the rear derailleur to shift up/down. If you hold both shift buttons together, then the front shifter should react.

They are wired though to your shifters, rather than being another wireless component. So the wires run from the shifters (left and right) to an individual blip. Blips are also used on triathlon bikes.

The blips attach to one of two ports on each shifter. So in theory you could have two buttons on each side (for a total of three shifters per side, or six shifters per bike). Just stick the cable in the port and then go ahead and place it where you want.

In my experience, eTAP responds just as quickly (or quicker) than any well maintained mechanical set. I know a lot of people want to weigh in on this and dissect it to all eternity. Within my FAQ section I offer my (probably humorous) analysis of speed to shift.

SRAM RED eTAP is the first electronic shifting system to use the ANT+ Shifting device profile to transmit gear status information. As of today, April 13th, 2016, two different companies have released support for eTAP: Garmin with the Edge 520/1000 & Wahoo Fitness with their ELEMNT.

You can see the battery status displayed on a standard data page. In the case of Garmin, they list the lowest battery out of the eTAP four (compared to Wahoo not having a data field on the main page, but instead showing each battery individually via the settings). So a bit of Apples to Oranges.

Extra shifters: Both systems allow secondary shift points, aka blips in eTAP lingo. Note that these blips are actually wired to your main shifters in eTAP on a road bike (though the junction box on a tri bike). In Di2 they go into a central junction box.

Weight: Exact weights will vary depending on how many blips (shift points) you install, as well as length of brake cabling. But in general eTAP will be slightly lighter (barely) than Di2. Note that sometimes sites forget to include the brake cabling/housing.

Cost: Generally speaking (again, depending on the exact components you select), eTAP will be a little cheaper. Especially once you add in aspects like the Di2 ANT wireless transmitter.

My hope is that when the time comes that a vulnerability is found (and eventually, there will be one), that SRAM moves just like any other software company would to get people to update their units via wireless firmware update. After all, they did include that USB updater stick with every kit.

of course i did! it works brilliant. bare in mind that a 50/33 front and a 11/30 cassette is not the same as 34 front and 32 rear. you can compare this with 34 front / 30,5 rear. it works flawless no adjustments to make. i also added the quarq powermeter and all is working perfect als under pressure.

Great review thanks. The one issue not addressed is availability. There seems to be a shortage especially for us here in South Africa. Do you have any idea when the tri system will be easily available?

With all things in the SRAM ecosystem, there is a very good possibility of a recall. That should be factored into a buying decision if you only got a single bike to ride. While the recall is free, the process takes weeks. You may not be able to get out on your bike during your recall, and reinstalling a wired groupset is a pain in the ass.

I do get the purpose of them, on a road bike setup at least, but in that sense they are no different to the di2 satellite shifters that you can get (climbing, sprint). And again, those different di2 options seem to be designed so that they ergonomically work in a much more natural fashion, and are visually attached to look much cleaner.

Thank you Ray

I already own Red eTap Groupset and I agree it is as simple as it can get. Very impressed with performance and still no chain drop or any kind of issue. I even test a new DuraAce shimano cassete / chain and it works flawlwesly

It seems the clearance of the front derailleur and crank arm due to its size its very small.

I do noticed during installation using my red crank the driver side arm is very close to FD cage (only 2mm) when is is set outwards. This could be an issue with other types of cranks which may contact the cage.

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