J. T. Eaton LCX9000 user manual Storage and Shipping, Maintenance, Technical Data

LCX9000 Liquid-Cooled Drives User Manual

January 2007

Storage and Shipping

If the drive is to be kept in storage before use, make sure that the ambient conditions are acceptable:

Storing temperature	-40 – 158°F (-40 – 70°C) (no cooling liquid inside cooling element
allowed below 0º)
Relative humidity	<96%, no condensation

If the storage time exceeds 12 months, the electrolytic DC capacitors need to be charged with caution. Therefore, such a long storage time is not recommended.

CAUTION

Always remove all cooling agent from the cooling element(s) before shipping to avoid damage caused by freezing.

Maintenance

In normal conditions, Cutler-Hammer Liquid-Cooled drives are maintenance-free. However, if the drive is used in conditions with temperatures below the freezing point and the liquid used for cooling is likely to freeze, be sure to empty the cooling element if the drive must be moved or if it is taken out of use for a longer time.

It may also be necessary to clean up the coolant ducts in the cooling element. Contact the factory for more information.

The instructions for the cooling system provided by its manufacturer must be followed.

Technical Data

Figure 1-1presents the block diagram of the liquid-cooled drive. Mechanically, the product consists of two units, the Power Unit and the Control Unit. The power unit can contain one to six modules (cooling plates), depending on the drive size. Instead of air, liquid-cooled drives use liquid for cooling. A charging circuit is embodied in the drives.

An external three-phase AC-choke (1) at the mains input together with the DC-link capacitor

(2)form an LC-filter. In drives, the LC-filter together with the diode bridge produce the DC-voltage supply to the IGBT Inverter Bridge (3) block. The AC-choke also functions as a filter against High Frequency disturbances from the mains as well as against those caused by the drive to the mains. In addition, it enhances the waveform of the input current to the drive. In chassis with multiple parallel line-rectifiers (CH74) AC-chokes are required to balance the line current between the rectifiers.

The power drawn by the drive from the mains is mostly active power.

The IGBT Inverter Bridge produces a symmetrical, three-phase Pulse Width Modulated AC-voltage to the motor.

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