Zener SMARTSTART 6000 Series, Руководство пользователя

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Installation - Mechanical
Technical Manual: Smartstart
®
6000 IMI0042 rev D
Page 4
Mechanical Installation
The Smartstart
®
should be installed by qualified
electrical personnel only. The following should be
considered when installing the Smartstart.
Mount in a vibration free environment.
Mount vertically and away from heat radiating
sources.
Do not mount in direct sunlight or on hot surfaces.
Mount in a suitable enclosure for the environment
in which it is to operate, the total heat dissipation
must be considered.
Do not drill holes into the Smartstart
®
enclosure.
Do not allow metal shavings or any other
conductive material to enter the enclosure or
damage may result.
Heat Dissipation
The Smartstart
®
is cooled by temperature controlled
internal fans. Installing a bypass contactor will reduce
the heat dissipated and the ventilation required. Soft
Starters generally dissipate approximately 4.5watts per
Amp when operated without a bypass contactor.
The heat dissipated can be calculated by;
Continuous Duty:
P = (FLC x 4.5)
Bypass Duty:
P = (FLC x SC x 4.5 x t x N) / 3600
Where;
P
= Power dissipated in Watts
FLC = Nameplate FLC of Motor
SC = Average starting current
expressed per unit of FLC
t = Starting time
N = Number of starts per hour
When installing the Smartstart
®
in an enclosure or
switch board it is necessary to consider the heat
dissipated and then the ventilation required.
The following formula’s will assist in determining
whether ventilation is required and how much.
Ventilated Enclosure:
V = (3.1 x P) / T
Where; V = Airflow required in m3/hour
P = Power dissipated in Watts
T = Temperature differential in °C
(inside – outside)
Non Ventilated Enclosure:
A = P / ( T x k)
Where; A = Exposed surface area of cabinet
in m2
P = Power dissipated in Watts
T = Temperature differential in °C
(inside – outside)
k = Heat transmission constant
(5 for Painted metal)
> 75mm
> 75mm
> 20mm
>
7
5
m
m
>
7
5
m
m