GE Industrial Solutions ASTAT XT - Manual (Page 48)

48 • Installation
Area [m 2 ] =
While a 820A motor is running and the motor current is 820A, heat dissipation can be calculated as:
Ploss=3x1.3x820+150=3,198Watt≈3.2kW
When a bypass contactor is used this changes the previous calculation to:
Ploss=3x1.3x0+150=150Watt≈0.15kW
It is obvious that using a bypass contactor can significantly reduce energy consumption.
You can reduce the amount of heat in an internal enclosure by using a bypass contactor and/or using additional
ventilation.
Important Note: If the motor is started frequently, the cabinet should be designed for greater heat dissipation.
You can reduce the enclosure heating by adding ventilation.
5.3.1
Forced Ventilation
Use the following arrangement for forced ventilation of the ASTAT-XT’s enclosure:
General purpose
enclosure
Fan at air outlet
ventilates
Non-ventilated
enclosure
Fan circulates existing
air.
Fan
Calculating the Enclosure Size, for Non-Ventilated Metal Enclosure
where:
Area [m
2 ] represents the surface area that can dissipate heat (front, sides, top).
Total heat dissipation [Watt] represents the total heat dissipation of the ASTAT-XT and other control devices in the
enclosure. If the ASTAT-XT is started frequently you should use average power.
5.4
Main PCB and Optional PCBs
QTx0008-QTx0072
Remove top cover and display to
access the main PCB.
QTx0085-QTx1400
Remove top cover of the control module to access the main PCB, optional
PCBs and fan control jumpers.
ASTAT-XT
ASTAT-XT
0.12 x Total heat dissipation [Watts]
60 – External ambient temperature [ºC]
Main PCB
location