Automation Direct Stellar SR55 Series, Руководство пользователя

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Chapter 1: Mechanical Installation
Page 1–3 Stellar
®
SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
m
echANIcAl
I
NsTAllATIoN
Mounting
Mount the soft starter to a flat, vertical surface using the mounting holes (or slots) on its base
plate. The dimension drawings, shown in the “Dimensions” subsection of this chapter, give
mounting hole positions and overall dimensions for each SR55 model. Ensure that:
• The orientation of the unit has the “TOP” uppermost, and within the vertical range shown
on the dimension drawings� (Mount the unit within 30° of vertical, for both side-to-side and
front-to-back dimensions�)
• The location allows adequate front access�
• You can view and access the touchscreen�
SR55 soft starters are not intended for mounting in environments containing corrosive
gases.
Requirements for an Enclosure
For a typical industrial environment, an enclosure should provide the following:
•
A single location for the unit and its protection/isolation switch gear�
•
The safe termination of cabling and/or bus bars�
• Allow minimum clearance distances around soft starters as specified in the tables shown with
the dimension drawings�
• Means to effect proper air flow through the enclosure and maintain temperature and
humidity within the ranges specified in the Mechanical Specifications table�
Enclosure Ventilation
Enclosure Ventilation
When fitting SR55 into an enclosure, ventilation must be provided if the heat output
of the unit is greater than the enclosure will dissipate. Use the following formula to
determine the enclosure 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.
The power dissipation of the thyristors are at their peak when the SR55 is in energy-
saving mode (iERS), therefore causing the most heat generated from the starter.
Heat dissipated can be approximated with the formula:
Watts (SR55) = 1/2 x (SR55 current rating) x 3
Q = (4xW
t
) / (T
max
- T
amb
)
Q = Volume of air (cubic meters per hour - m
3
/h)
W
t
= Heat produced by the unit and all other heat sources within the enclosure (Watts)
T
max
= Maximum permissible temperature within the enclosure
(50°C for a fully rated SR55)
T
amb
= Temperature of the air entering the enclosure (°C)
(If you prefer to work in CFM, substitute °F for °C. Q is now in CFM)