55 • Installation
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Area [m
2
] =
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:
a. Using additional ventilation
b. Using a bypass contactor
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.
6.3.1 Forced Ventilation
Use the follo
wing arrangement for forced ventilation of the RVS-DN’s enclosure:
RVS-DN
General purpose
enclosure
Fan at air outlet
ventilates
RVS-DN
Non-ventilated
enclosure
Fan circulates
existing air.
Fan
6.3.2 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 RVS-DN and other control devices
in the enclosure. If the RVS-DN is started frequently you should use average power.
6.4 Main PCB and Optional PCBs
RVS-DN 8-72A
Remove top cover and display to
access the main PCB.
RVS-DN 85-3000A
Remove top cover of the control module to access the main
PCB, optional PCBs and fan control jumpers.
0.12 x Total heat dissipation [Watts]
60
External ambient temperature [ºC]
Main PCB
location
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