24V Dc Voltage Drop Calculation Example - Allen-Bradley Kinetix 5700 User Manual

1606-XLxxx
24V DC Control Power
Allen-Bradley
1606-XL
Powe r S u p p l y
(customer-supplied)
Input
AC Input Power
Kinetix 5700 Drive System
(front view)

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
21.3 m (70 ft)
2198-RP312
2198-S312-ERS4
Regenerative Bus Supply Single-axis Inverter
MOD MOD
Input Wiring NET NET
Connector
2
2
1
1
I/O
1 6 I/O
1 6
OK+
OK–
EN–
EN+
5 10
5 10
W
2
21mm (4 AWG-250 kcmil)
15-20 Nm (132-177 lbin)
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
DC Control Power Current Demand
Module
2198-RP312
2198-S312-ERS4
2198-D057-ERS4
Total current demand
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).
Rockwell Automation Publication 2198-UM002G-EN-P - February 2019
Size Multi-axis Shared-bus Configurations
2198-S312-ERS4
Single-axis Inverter
MOD
NET
2
1
I/O
1 6
5 10
- -
MBRK MBRK
+ +
V U W V U
21mm (4 AWG-250 kcmil) 2
15-20 Nm (132-177 lbin)
Qty Current Demand
1 9.1 A
2 4.6 • 2 = 9.2 A
2 2.3 • 2 = 4.6 A
22.9 A
Appendix C
2198-D057-ERS4
Dual-axis Inverters
24V DC Shared Bus
Control Power
MOD MOD
NET
NET
2
2
1 1
I/O-A I/O-B I/O-A I/O-B
1 6 1 6 1 6 1 6
5 10 5 10 5 10 5 10
UFB-A UFB-B UFB-A UFB-B
D+ D+ D+ D+
D- D- D- D-
MF-A MF-B MF-A MF-B
Calculate 24V
on page 396 for current values.
397