Installation Instructions

Table Of Contents

CPO-PC400-W/CPO-PC400-UW HVAC CONTROLLER

27 EN0B-0085 IE10 R0420

Connection to Field Bus Modules Powered by the Same Transformer as the CPO-PC400-

W/CPO-PC400-UW

This configuration is suitable for connecting FBAs which are all located in the same wiring cabinet as the CPO-PC400-

W/CPO-PC400-UW.

Fig. 18. Connection (L < 3 m) of RS485 interfaces 1, 2, or 3 (RS485 interface 1 shown) to a Field Bus

NOTES:

— N = max. 31 unit loads. Normally, in this case (i.e. with a bus length of max. 3 m), it is not necessary to employ

termination resistors.

— For communication cable lengths, transmission speeds, and termination, see “General Information on the

RS485 Standard” section on page 7. For fusing, see “Fusing” section on page 11.

GND

FBA #1

Isolaon

Barrier

5V_ISO

GND_ISO

RS485+

RS485-

110VAC/230VAC

24VAC

FBA #N

Field Bus +

Field Bus -

24VAC-COM

L < 3m

24VAC

Field Bus +

Field Bus -

24VAC-COM

24VAC

Shielding

Oponal

FGND

24V0

24V~

CH1+

CH1-

GND1

CPO-PC400-W/CPO-PC400-UW