Rockwell Automation 284 ArmorStart User Manual - Manual (Page 443)

24V DC Control Design Considerations F-3
Figure F.3 Centrally Located Power Supply Distribution
Therefore, both runs can be #14 AWG. The controllers on section 3
are considered to have no length since the power supply is very close
to the units.
24V DC Power Supply Capacity Sizing
The 24V DC power supply current rating required for an ArmorStart
system can be calculated by the following formula:
Example – Calculation of 24V DC Power Supply Requirements
Size the power supply for Example 1 – Conveyor Line Configuration.
Each starter has a .1A customer load.
I supply = 10*.17 +5*.710 + 5*.063 + 0*.425 + 10*.1
I supply = 1.7+ 3.55 + .315 + 0 + 1 = 6.57A
Conveyor
Section 1
Conveyor
Section 2
Conveyor
Section 3
Conveyor
Section 4
Conveyor
Section 5
24 vDC
Power
Supply
# 14 AWG # 14 AWG
D1
D2
24V DC
Power
Supply
D3
D4 D5
Distance 1 Distance 2 Distance 3 Distance 4 Distance 5 Equivalent Distance
Run 1 + 50 ft (15 m) + 50 ft (15 m) * 2 150 ft (46 m)
Run 2 + 0 ft (0 m) * 3 + 50 ft (15 m) * 2 + 50 ft (15 m) 150 ft (46 m)
I supply = N*.25A + K*3A + J*.3A + L*.425A + M
N = No. of 280/281 ArmorStart units with the HOA plus 283 ArmorStart units
K = No. of ArmorStart (280,281and 283) that will be commanded start simultaneously, K = 1 minimum
J = No. of ArmorStart (280,281and 283) that will be commanded to hold in at any time
L = No. of 284 ArmorStart Units
M = Current drawn by customer loads