34
4 CONNECTIONS
4.4 Supplying Power to a Bridge Module
■
Description of the conditions 2) and 3)
• Vm: Supply voltage for the bridge module
Voltage: 21.6 to 27.6VDC (24VDC - 10 to + 15%), ripple voltage 0.5Vp-p or lower
Recommended voltage: 26.4VDC (24VDC + 10%)
•
V(V): Cable-to-cable voltage drop
V(V) = Transmission cable supply current I(A)
Cable resistance R(
)
Cable resistance R(
) = Cable length (m)
Conductor resistance (
/m)
2
Wire diameter 1.25mm
2
Conductor resistance 0.015
/m
Wire diameter 0.75mm
2
Conductor resistance 0.025
/m
■
Calculation example
The example shows how to check whether the total length of 100m is sufficient to configure a system in the following
conditions.
[Condition]
• Non-isolated slave module (Input ASLINKER)
Number of I/O points: 2 points
Module current consumption: 15mA
Number of modules: 24
• Connected load (three-wire sensor)
Three-wire sensor current consumption: 13mA
Number of sensors: 2
Power supply voltage: 24VDC
10%
• Wire diameter of transmission cables (DP, DN)
Wire diameter: 1.25mm
2
• Power supply for the bridge module
Power supply voltage: 24VDC
[Calculation result]
Condition 1)
(Ihin(A)
m) = I(A)
The maximum transmission cable supply current
(0.015 + (0.013
2))
24 = 0.984A
1A
Satisfied
Condition 2)
Vm(V) -
V(V)
20V
24 - (0.984
100
0.015
2) = 24 - 2.95 = 21.05V
20V
Satisfied
Condition 3)
Vm(V) -
V(V)
The lowest allowable voltage of the connected load
The lowest limit of the allowable voltage range for connected load = 24 - 24
0.1 = 21.6V
21.05V < 21.6V
Not satisfied
The calculation results 1) to 3) above show that no system can be configured.
However, a system can be configured by changing the power supply for the bridge module to 24.55VDC or higher.
Содержание AnyWire NZ2AW1C2AL
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