Blog7 - EN

FFU Service - Fraunhofer Gesellschaft

With its various institutes Fraunhofer Gesellschaft belongs to the greatest Cleanroom Operators in Germany.

Yesterday a production shutdown was planned in a job-side in northern Germany, used by different companies to perform their annual maintenance. So the FFU System, delivered with EC-fans from Nicotra||Gebhardt and commissioned by vbk technology in 2013 was checked was well.

Uniquom - worldwide

From now on one of the greatest manufacturers of capacitor foil controls his ebmpapst EC-fans withModbus- and ebmBUS- Interface by anuniquom handheld.

Because of the Slovakian branch ordered directly we are glad about the 23rd country-link in ourinteractive customer map.

Compressor Racks for Blast Freezers

Together with our Partner KälteConceptwe finished a plant with several compressor racks for blast freezers, spiral cooling conveyors and frozen storages with cold and warm brine generation on a Siemens PLCS7-1500 CPU programmed with TIA-portal.

In total the plant consists of:

• - 4 R723 compressors, one controlled by Variable Frequency Drive (VFD) the other 3 compressors in a 2-step-control mode
• - 3 CO2 compressors for a blast freezer, one VFD-controlled
• - 1 compressor for frozen storage, VFD-controlled
• - defrosting, blast freezers and frozen storages with warm brine
• - 3 integrated rack controllers for demand oriented supply of the refrigerating capacity
• - demand oriented control of a R723 condenser
• - heat recovery for warm brine generation
• - controlled warm brine flow to reduce the thermal stress of the evaporator while defrosting
• - cold brine charge cycle with pump redundancy to compensate for different operation hours

Service uniqunet – FFUs in Cleanroomapplication

„Troubleshooting - Commissioning - Training“ were written at the P.O. of a big plant engineering company. They pleased us for support for commissioning a FFU-network with fans from ebmpapst with Modbus Interface at site and to train the operating staff afterwards.

After an address-conflict was eliminated in the FFU-network and no other abnormalities were found we did the programming of the uniqunet FFU-control device together with the end user. Now 3 FFU groups will be controlled according to the manufacturing process with different set-values in day/night mode.

Service uniqunet – FFUs in Cleanroomapplication

Test Set-up for uniqunet PCBs

A new test device allows the automatic test of the uniqunet PCBs before commissioning.

• In detail, the following steps will be performed automatically, after the 24V (=) power supply is applied:
• - Test of all created voltages at the PCB,
• - Functionality test of all digital In- and Outputs and adjustment of the analogue inputs.

The testing device is linked to an HTML-Web-surface at a PC from where it is controlled. An Arduino Microcontroller is working on the test board and makes the data processing for the PC-software. After the tests have been successfully a PDF is created and stored automatically.

Replace a defective Siemens PLC of a swimming hall Automation

Corrosion and other environmental factors required the replacement of a S7-313 PLC and its OP7 operating interface by a S7-314 with a touch panel KTP 400 Comfort done by our PLC technicians in the following steps.

• - Transmission of the old step 7 program to the new PLC
• - Programming of the visualization in TIA Portal
• - link of Step7 project to visualization with TIA Portal
• - Reconstruction of all PLC components and the new panel to the existing switchboard