87
Power Supply Wiring
Section 3-5
Supplying I/O Power
from Multiple Sources
Supplying I/O power from multiple power supplies instead of from one power
supply enables reducing the line current, reducing the voltage drop, and
decreasing the size of the cable. Using multiple power supplies should also be
considered to increase system safety when power supply errors occur.
3-5-7
Other Precautions
Power Supply Errors
The location of power supplies and the grouping of Slave Units should be con-
sidered based on whether the overall system is to be stopped when a power
supply error occurs.
If it is necessary to prevent the overall system from stopping to ensure system
safety, consider placing power supplies in more than one location and con-
sider the way Slave Units should be grouped when supplying power.
Cost Considerations
Also consider the power supply methods in light of the total cost, including the
following items:
The capacity and number of power supplies, Cable thickness (allowable cur-
rent) and length (voltage drop), System safety, and Wiring work.
1
3
2
I
1
I
2
I
3
4
I
4
Load
Design the wiring so that a sta-
ble power supply voltage is sup-
plied to the end load.
If a stable power supply voltage cannot sup-
plied to the end load, place the power supply
in the middle of the network.
Slave
Slave
Slave
Slave
Load
Load
Load
Power supply
(24 VDC)
Power supply
(24 VDC)
Slave
Power supply
(24 VDC)
Slave
Slave
Slave
Power supply
(24 VDC)
Summary of Contents for CRT1 - 10-2008
Page 2: ...CRT1 Series CompoNet Slave Units and Repeater Unit Operation Manual Revised October 2008...
Page 3: ...iv...
Page 5: ...vi...
Page 9: ...x...
Page 15: ...xvi...
Page 23: ...xxiv Conformance to EC Directives 6...
Page 51: ...28 Slave Unit Models Section 1 2...
Page 123: ...100 Connecting External I O for Slave Units Section 3 6...
Page 365: ...342 Temperature Input Units Section 7 5...
Page 381: ...358 Expansion Unit Specifications Section 8 2...
Page 418: ...395 Repeater Unit Section 10 2 Dimensions 42 3 50 3 1 27 5 95 mm...
Page 419: ...396 Repeater Unit Section 10 2...
Page 424: ...401 CX Integrator Section 11 1...
Page 575: ...552 Current Consumption Summary Appendix D 552...
Page 581: ...558 Index...
Page 583: ...560 Revision History...