J. T. Eaton Liquid-Cooled Drives LCX9000 - Manual (Page 15)

LCX9000 Liquid-Cooled Drives User Manual
MN04005001E For more information visit: www.EatonElectrical.com 1-3
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 1-1 presents 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.