New iP5A HVAC inverter

Second quarter 2006 Electrical switching & drive systems & components

LS Industrial Systems recently launched its new iP5A inverter, which is specifically intended for HVAC applications. Besides the usual square law torque curve for centrifugal fans and pumps, the series, available in the range 5,5 to 90 kW, has a number of important control features, some of which can eliminate the need for a system PLC.

An example of this is the multimotor control (MMC) algorithm. The drive can sequence control up to five motors in a pump station, including time-sharing. In this case the first motor runs in full PID mode. As the motor speed reaches maximum, the next pump is switched in, and so on, until all pumps are running during maximum demand periods. As demand reduces, the pumps are then sequentially switched out, until only the main pump is again running on PID control. The drive also has a sleep and wake-up function, useful in low demand situations, which can effect great energy savings.

In damp conditions, typical in pump stations, the iP5A, by means of multilevel PWM reduces the amount of current leakage to ground and therefore the chance of a system trip. As with all LS inverters, the iP5A is fully earth-leakage protected, even while running, eliminating catastrophic failure under these conditions, a situation so prevalent amongst many similar products.

Option boards are available for Profibus, DeviceNet and Metasys communications, while Modbus and RS485 are standard protocols. Other features such as preheating, flying restart, power dip ride through, auto energy saving, power consumption display and flux braking make the iP5A a remarkable piece of equipment. In creating the iP5A, LS Industrial systems has endeavoured to cover all the present requirements of the HVAC industry as well as those of the future.

For more information contact Keith Gross, LS Industrial Systems, +27 (0) 21 914 9034, Clive Shawe, Ana-Digi Systems, +27 (0) 11 658 1337, www.anadigi.co.za

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