MCCB Modbus Communications

MCCB Modbus Communications

Certain LS MCCBs can be ordered with communications to allow interfacing with a modbus RS-485 network.

Overview

Wiring
Terminals C1 (TRx+) and C2 (TRx-) is the communication bus connection points on the ETM type MCCBs. 22~26AWG twisted pair wiring is recommended.


Terminals 01 and 02 are the bus connection points on the digital OCR.


Power Requirements
MCCBs require an external 24VDC supply when utilizing communications.
  1. For MCCBs with a digital trip relay (OCR) and the communication option.... Power consumption is 2VA per MCCB.
  2. For MCCBs with the electronic trips (ETM33, ETM43) and the communication option, 24VDC is required on the P1(+) and P2(-) terminals. Power consumption is .7VA per MCCB.
For DC power, VA is directly equal to Watts. 

Registers
See attached spreadsheet for list of registers.