LINE CALCULATION
To set the product and the intensity of the MOBILIS ELITE line, two parameters must be considered
simultaneously:
The voltage drop on line, which must be below the permissible value
The product current capacity, which depends on the ambient temperature and on the duty
cycle factor.
The following data must be known:
• Maximum intensity in continuous operation
• Type of receivers (cage or slip-ring motors, electronic starters, resistors)
• Receiver start-up intensity
• Maximum ambient temperature
• Maximum distance between a receiver and the nearest feeding point
• Permissible voltage and voltage drop in continuous operation and at start-up
• Type of current
• Running cycle of the receiver (duty cycle)
You can find out immediately the most suitable intensity by connecting to our website
www.fels.fr
and using our on-line "
Mobilis Price Calculator
".
For help in calculation by our Customer Service Department, fill out the
Consultation Sheet
.
For manual calculation, follow the procedure below.
1.
INTENSITY IN CONTINUOUS OPERATION
Take into account the number of receivers which run simultaneously and calculate the
corresponding intensity:
I
N
= I
1
+ I
2
+ … + I
n
The intensity may be worked out from the power of the receivers.
In a three-phase system, this gives:
𝐼𝑛 =
𝑃𝑢
𝜂. 𝑈. √3. 𝑐𝑜𝑠𝜑
Where:
I
n
: absorbed current (in Amperes)
P
u
: power output of the receiver (in Watts)
η : receiver efficiency (between 0.6 and 0.96 for
a cage motor)
U : operating voltage (in Volts)
cos
ϕ
: power factor
Mobilis line calculation
www.fels.fr
|
T +33(0)3 88 67 10 60
|
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Edité le 04/01/2017
Page 10/223