Mechanical Installation; Mounting; Requirements For An Enclosure; Enclosure Ventilation - Automation Direct Stellar SR35 Series Quick Start Manual

SR35 Quick-Start Guide

Mechanical Installation

m
ounTIng
Fix the unit to a flat, vertical surface using the mounting holes (or slots) on its
base-plate. The mechanical outline diagrams, shown on
dimensions and mounting hole positions for each model. Ensure that:
• The orientation of the unit has the 'TOP' uppermost
• The location allows adequate front access
• You can view the keypad display
• Do not install other equipment that generates significant heat close to the soft
starter
r
equIremenTs for an
For a typical industrial environment, an enclosure would provide the following:
• A single location for the unit and its protection/isolation switch-gear
• The safe termination of cabling and/or busbars
• Means to effect proper air flow through the enclosure if the heat output of the unit is
greater than the cabinet can dissipate
e
nClosure
When installing the SR35 soft starter into a cabinet, ventilation must be provided
if the heat output of the unit is greater than the cabinet can dissipate. The heat
dissipated can be approximated with the formula:
• Starting: Watts (SR35) =
• Running: Watts (SR35) = 04 x running amps
Use the following formula to determine the fan requirement. An allowance has been
incorporated into the formula so that the figure for Q is the air delivery in the fan
suppliers' data.
• Q = (4 x W
• Q = Volume of air (cubic meters per hour - m
• W =
t
Heat produced by the unit and all other heat sources within the enclosure (Watts)
• T = Maximum permissible temperature within the enclosure
max
• T = Temperature of the air entering the enclosure (°C)
amb
a d
lTITude eraTe
Altitude above sea level 1000m (3281ft).
Above 1000m, derate by 1% of SR35 i.e. per 100m (328ft) to a maximum altitude of
2000m (6562ft).
a T
mbIenT emperaTure
-20°C (-4°F) to 40°C (104°F).
Above 40°C, derate linearly by 2% of SR35 i.e. per °C to a maximum of 60°C (140°F).
4
e
nClosure
V
enTIlaTIon
(start current(A)) x (start time(s)) x (number of starts per hour) ÷ 1800
) ÷ (T - T )
t max amb
(40°C for a fully rated SR35)
(If you prefer to work in CFM, substitute °F for °C Q is now in CFM)
d
eraTe
Stellar® SR35 Series Soft Starter Quick Start Guide – 1st Ed – 07/09/2020
page 6, give the
3
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