Rockwell Automation Publication 2198-UM002G-EN-P - February 2019 397
Size Multi-axis Shared-bus Configurations Appendix C
24V DC Voltage Drop Calculation Example
In this example, the 24V DC power supply is 21.3 m (70 ft) away from the
Kinetix 5700 drive system. The drive system includes one 2198-RP312
regenerative bus supply, two 2198-S312-ERS4 single-axis inverters, and two
2198-D057-ERS4 dual-axis inverters. The inverters supply power to six non-
brake motors.
Figure 207 - 24V DC Voltage Drop Example System
Follow these steps to calculate the voltage drop for your drive system. The
system conditions remain the same, but the wire gauge (AWG) is increased to
reduce the voltage drop.
1. Determine the 24V DC control power current demand.
In this example, the total current demand is 22.9 A. See Calculate 24V
DC Control Power Current Demand on page 396 for current values.
2. Determine the voltage drop across the wire that is used to supply 24V
power to the drive system (voltage drop = current draw • resistance of
the wire).
MOD
NET
2
1
1
I/O
6
5
10
OK+
OK–
EN–
EN+
1606-XL
Power Supply
Input
Allen-Bradley
MOD
NET
2
1
1
I/O
6
5
10
MBRK
+
-
21mm (4 AWG-250 kcmil)
15-20 Nm (132-177 lbin)
2
W V U
MOD
NET
2
1
UFB-A UFB-B
D+
D-
MF-A MF-B
D+
D-
1
I/O-A
6
510
1
I/O-B
6
510
MOD
NET
2
1
1
I/O
6
5
10
MBRK
+
-
21mm (4 AWG-250 kcmil)
15-20 Nm (132-177 lbin)
2
W V U
MOD
NET
2
1
UFB-A UFB-B
D+
D-
MF-A MF-B
D+
D-
1
I/O-A
6
510
1
I/O-B
6
510
Kinetix 5700 Drive System
(front view)
24V DC Shared Bus
Control Power
2198-D057-ERS4
Dual-axis Inverters
2198-RP312
Regenerative Bus Supply
2198-S312-ERS4
Single-axis Inverter
1606-XLxxx
24V DC Control Power
(customer-supplied)
AC Input Power
Input Wiring
Connector
2198-S312-ERS4
Single-axis Inverter
21.3 m (70 ft)
Module Qty Current Demand
2198-RP312 1 9.1 A
2198-S312-ERS4 2 4.6 • 2 = 9.2 A
2198-D057-ERS4 2 2.3 • 2 = 4.6 A
Total current demand 22.9 A
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