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While a 820A motor is running and the motor current is 820A, heat dissipation can be calculated as:
When a bypass contactor is used this changes the previous calculation to:
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.
Forced Ventilation
5.3.1
Use the following arrangement for forced ventilation of the ASTAT-XT's enclosure:
ASTAT-XT
Calculating the Enclosure Size, for Non-Ventilated Metal Enclosure
Area [m
] =
0.12 x Total heat dissipation [Watts]
2
60 – External ambient temperature [ºC]
where:
Area [m
] represents the surface area that can dissipate heat (front, sides, top).
2
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.
Main PCB and Optional PCBs
5.4
Main PCB
location
QTx0008-QTx0072
Remove top cover and
display to access the main
PCB.
• Installation
48
Ploss=3x1.3x820+150=3,198Watt≈3.2kW
Ploss=3x1.3x0+150=150Watt≈0.15kW
General purpose
enclosure
Fan at air outlet
ventilates
Remove top cover of the control module to access the main PCB, optional PCBs
ASTAT-XT
QTx0085-QTx1400
and fan control jumpers.
Non-ventilated
enclosure
Fan circulates existing
air.
Fan
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