Blog - EN

Extension of a FFU Plant

3 ago we reported of the accomplishment of a larger FFU-Plant in Eastern Europe. Almost 2000 EC-FFUs with proprietary RS485-Interface have been running since then without any issue.

As the costumer sent us the FFU-Server for the job, we took to opportunity to do a complete system update. From now on the GUI is running no more java based, but on different web browsers.

Power-OFF at FFU Plants

Following the last maintenance of a FFU-plant, voltage OFF/ON tests cycles caused that the EC fans from Nicotra||Gebhardt no longer reached their speed setpoints in a certain time, so that at several EC-drives speed control errors occurred. This kind of self-monitoring serves to ensure product safety so that units with a possible defect, such as a blocked impeller, do not keep trying to reach the set speed and switch themselves off.

The operator of the plant was once again advised with the following hints: “If cyclic OFF/ON tests are absolutely necessary, the FFU power circuits may be excluded. If this is not possible, the FFUs should be stopped before acting. This can be done either from the GLT or from the FFU-server.”

Since neither heavy tools nor spare parts were needed for the appointment, the climate-friendly train journey was a good choice.

Cleanroom-Supplier from Taiwan visits Vogtland

Since more than 10 years General Ventitech Co. Ltd. has been our partner in Taiwan. No matter if support while building FFU-servers for cleanroom applications or the adaption of older EE-fans to latest control networks, or even the normal hardware business of control devices for EC-fans, it has become way more than business, it’s friendship.

CEO Schilling Yu (2nd from the left) and staff members at vbk technology

FFU Control without JAVA

Since round about 3 years the FFU-Server of one of our biggest cleanroom customers has been running on a virtual basis. The actual FFU-Server runs as service, but the graphical-user-interface (GUI) at java-based Internet Explorer. While the server part was more or less permanently improved over the years and utterly accepted by our customers, the GUI caused more and more complains. That part was using Internet Explorer based on JAVA-scripts. Sometimes MS edge took simple over the command and suppressed the old JAVA-GUI.

As the actual FFU-Server-core does not care about its GUI, the scheduler or the Inline I/O interacting and even the total OPC-Control by an overlaid FMS are still in charge, some customers even did not take note about the “deactivated” GUI, but it’s not nice, anyhow. Since a few months there is a solution for this. By a small program all functions of the GUI are presented in any Browser no matter if Edge, Chrome or Firefox. So our customers expect no more surprises if they are going to check the FFU-control.

uniqunet® - Trademark

From now on the trademark uniqunet is registered under file number 30 2023 008 408.1.

FFU-Control ebmpapst Modbus 5.0.1 lite

Normally the commissioning of “smaller” cleanrooms with our EC-control devices runs smoothly, that even completely new customers are able to manage this with a bit telephone support no matter if the FFUs uses ebmpapst-, NicotraGebhardt-, Rosenberg- or Ziehl Abegg-drives. But not so at a Biotec enduser in northern Germany end of January. Unfortunately more than one single issue existed that causes some trouble. Firstly a wrong cable PIN of the RJ45 (green/white instead of orange/white) was used that NetA and NetB of the main backbone was no more a twisted pair. Furthermore due to whatever reason the Modbus communication was not that fast and swift as usual.

As beside of a very few revisions hatches the whole cleanroom was completely sealed the search for the root cause for the pretty sluggish communication was not found. Finally a proper termination (RT = 120 Ohm) at the end of the modbus-rtu-line of 400m length lead to better system response times that the customer was satisfied even if the technicians loves to understand such things completely.