Blog empresa Dynatech

13 August, 2020

Dear Customers,

Dynatech is pleased to announce the certification of the DA (single acting) and DA-UD (bi-directional) electromechanical activation systems. The links to download both certificates, as issued by the Notified Body TÜV SÜD ATISAE, are provided below:

- DA electromechanical activation system (single acting)

- DA-UD electromechanical activation system (bi-directional)

These new electromechanical systems have been designed to activate the current ASG and ASG UD progressive safety gears, which are well known to our customers.

There have been no changes in the qualification approval for these safety gears; with the same range of use and technical and dimensional features.

Linking the DA and DA-UD electromechanical activation systems with the ASG and ASG UD mechanical safety gears has resulted in the eASG (single acting) and eASG UD (bi-directional) electromechanical safety gears. We believe that naming them this way makes things much simpler.

As can be seen on the certificates, there are 2 electromechanical activation subtypes: one with a single coil and PWM (Pulse-Width Modulation) and another with a double coil: one for resetting and the other for retention.

Dynatech is going to market the dual coil subtype only.

How should the electromechanical safety gear be connected to the rest of the electronic components?

In theory, it is very simple. The 2 reset coils (1 for each side) have to be managed by the controller.

The 2 retaining coils (1 for each side) must be managed by the SIL3 electronic encoder or overspeed governor, as this controls the safety line.

What advantages does the electromechanical safety gear have over the conventional type?

Although the electromechanical safety gear needs to be commanded by an SIL3 category electronic encoder or overspeed governor (therefore, the cost of these must be added), many other components associated with a conventional safety gear are not required: overspeed governor, tensioning pulley, driving bar (linkage).

In addition, other components – in the lift shaft itself – are not required; such as the floor magnets, limit switches and even the buffer, in the case of EN81-21.

All this entails both a saving in material as well as installation costs, so we believe the final cost should be cheaper.

And, of course, maintenance costs will also be reduced by having fewer items in constant motion.

Very important: user safety will increase significantly, as the response time of the safety gear– if triggered – is immediate; this does not happen in the conventional, mechanical configuration of safety gear + overspeed governor.

What advantages does our electromechanical safety gear provide?

- In normal daily use of the lift, consumption will be very low as only the retaining coil will operate.

This coil keeps the engagement rollers in their set position, allowing the lift to move. If the lift is not used for a certain period of time, the controller can be programmed to switch the retaining coil off, whereupon the energy consumption will drop to zero (in Sleep or Stand-by mode). In this state, the rollers rest on the guide rail so, if there is a UCM, they will come into operation.

When a user presses the call button, the reset coil retracts the rollers towards the retaining coil to hold them in their set position. All this takes place long before the user enters the lift.

- Because of the performance of the double coil, Dynatech can improve the safety of lift installers during the installation process in the shaft. We are working on an option to be able to offer it in the shortest possible time.

It is based on the “dead man” technology used in trains and is an electronic box with a battery to power the electromechanical safety gear coils. This box has a button which has to be pressed constantly so that the rollers stay in their set position and allow the hoist to lift or lower the frame (this can be that of the lift itself, thus saving time).

Once the person stops pressing the button, the retaining coil is disconnected and the rollers will make contact with the guide rail.

If this happens because the installation process needs to be continued, the rollers will be in Stand-by and not interlock. However, if it happens by accident and the frame keeps moving, the safety gear will engage and stop the frame.

- Another of the main advantages of our electromechanical safety gear is that each status (set, stand-by or engaged) has its corresponding contact that monitors it on both sides. If you have remote technical assistance, using your control, you will be able to both monitor the safety gear status and operate it, even from your office.

Quite simply, there is nothing like it.


We are currently working to add these new products into our product range on both our website and ERP.

It is all so new, that we are still translating the use and maintenance instructions and certificates themselves into the different languages we usually offer.

However, while we are finishing this process, if you want us to forward these instructions to you or if you need any additional information, please contact us and we will be happy to help you.

Thank you very much for trusting in Dynatech.

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