Electricity + Control March 2017

DRIVES, MOTORS + SWITCHGEAR

ROUND UP

Drives for auto-retrieval area at major pharmaceutical distributor

Pharmaceutical distributor and logistics service provider DSV Healthcare of Meadowview, Johannesburg is a showcase of SEW-EURODRIVE products, with a large quantity of drives in the automatic retrieval area alone. The four-year-old Meadowview facility is the result of extensive growth at DSV Healthcare, which distributes products to pharma- cies and hospitals throughout South Africa, as well as exporting to the rest of the continent. Maintenance Manager Peet van der Linde adds that the plan is to add the MOVITRAC LTP-B Eco HVAC drive units to its extensive spares inventory, as the company cannot af- ford any downtime on any of its systems. It is also planned to standardise on SEW-EURODRIVE products at the pharmaceutical distributor in the future, as its automated pick- and-place and sorting system, including cranes and conveyor belts, already uses gearmotors and drives from the German OEM. “In the automatic retrieval area alone, which has 16 levels and is 28 m high, we have a large quantity of drives from SEW-EURODRIVE. “The main benefit of standardising on SEW-EURODRIVE prod- ucts, apart from the quality and cost-effectiveness, is the aftermarket service and support that is offered,” van der Linde adds. In addition, the HVAC drives are extremely user-friendly in terms of installation and start-up, with a text-based screen guiding the user through the parameters. The new HVAC drives are an integral part of DSV Healthcare’s facility-wide Building Management System from Johnson Controls. The Medicines Control Council, which regulates the Medicines and Related Substances Act for the manufacture, distribution, sale, and marketing of medicines, requires the facility to maintain a constant humidity of 60% and a temperature of 22°C. “If the humidity and temperature level of our facility goes out of range, it becomes a reportable deviation after 24 hours.This means we end up with critical stock that cannot be distributed.Therefore it is vital that the internal environment be maintained within the prescribed parameters,” van der Linde comments. DSV Healthcare decided to opt for the MOVITRAC LTP-B Eco HVAC drive units from SEW-EURODRIVE following lightning damage of existing competitor units. Despite heavy storm conditions following the successful installation, the drive units have performed flaw- lessly, comments Mechatronic Sales Engineer Hendri Oosthuizen.

“These units were supplied to run the centrifugal evaporator fans for the client’s building air-conditioners.They offer exceptional reliability and longevity due to the fact that they are supplied with built-in line filters.” Oosthuizen notes that the design specifications were three-phase 400V supply, 15 kWHVAC drives, while the instal- lation requirements were IP55, analogue setpoint control, and relay feedback for running and alarm status. The main advantage of the new HVAC drive is that it is designed for maximummotor-control efficiency. Efficiency is improved by up to 4% compared to standard AC drives, while also reducing supply current total harmonics distortion (iTHD), improving the Real Power Factor, and reducing total input current, leading to installation cost- savings through reduced cable and fuse ratings and smaller supply transformer rating.The drives are also manufactured in accordance with RoHS, a European Union product directive applying to electron- ics manufactured within the EU, or imported from other countries. Additional features include intelligent standby. This parameter defines the time period whereby if the drive operates at minimum speed for greater than the set time period, the LTP-B HVAC output will be disabled, and the display will show ‘standby’.This parameter can be customised according to the customer requirements.Another feature is the energy-saving function. When enabled, the inverter automatically reduces the applied motor voltage at light loads.This inverter is also EN 61000-3-12 com- pliant, and has a wall-mounting design, an OLED multi-language plain text display, and interfaces for BACnet IP, EtherCat, DeviceNet, Profibus DPV1, ModbusTCP, and ProfiNet. The drive also has a programmable service-interval parameter for routine drive or systemmaintenance alerts, with the diagnostics menu including a handy read-only ‘time to service’ parameter.The OLED display flashes an indicator whenever a service is due. Meanwhile, the drive outputs are configurable for ‘service due’ indication, followed by a simple service ‘reset’ procedure. The Variable Speed Drive (VSD) service procedure is as recommended by SEW-EURODRIVE, with published checks for increased product life. Other features include fire mode, fan-belt break detection, a PID sleep/standby function, and a bypass control. While a qualified electrician is required in terms of the wiring, SEW-EURODRIVE is always willing and able to assist clients with

start-up if required. Oosthuizen adds that the inverters on the new HVAC drives boast an array of ‘smart’ features to assist with maintenance and service intervals for pumps and fans. Enquiries: Jana Klut. Email JKlut@sew.co.za

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