Rockwell Automation 1608M MegaDySC Installation Instructions 400 A - Manual (Page 16)

18 Rockwell Automation Publication 1608M-IN001A-EN-P - September 2013
Chapter 3 Communications
CBI Contacts
(Input Circuit Breaker) Relay K1 activates on any input circuit breaker shunt-trip signal ("CBI-ST").
Heatsink over-temperature, cabinet over-temperature, SCR Failure, Blown-Fuse
or Open-Door indicators will all assert the CBI ST signal to open the input
circuit breaker, removing power from the MegaDySC. When this signal is
present, Relay K1 is activated and its Normally-Open contacts close. Note that
this is not a position indicator for the CBI circuit breaker: the CBI ST signal will
be present for only one (1) second when the shunt-trip command is asserted. The
Input breaker CBI will not automatically reclose after any shunt trip operation;
user intervention is required to manually reset the system to operational status.
Remote Seamless Bypass
Command-EPO A normally-open PLC contact, relay contact, or push-button contact may be
connected between TB1/14 and TB1/15. Contacts must be rated for at least
120V AC at 25 mA. Note that 120V AC is present at TB1/15 when the
switchboard is energized. Close the contact to initiate an automatic seamless
bypass operation: CBB will close, then CBI and CBO will open, removing power
from the MegaDySC cabinet; voltage sag correction will then be disabled.
This feature may be utilized as an Emergency Power Off (EPO) function for the
MegaDySC cabinet. Power to the output loads or output distribution panel, if
present, will not be interrupted. Note that the automatic bypass functionality
requires that nominal AC power is present at the switchboard input terminals.
Contact Ratings The CBB aux. contacts (Terminals 10B-12B of TB1) are rated at 6A @
600VAC, 0.5A @ 125VDC or 0.25A @ 250VDC. The DC ratings are for non-
inductive loads only. The K1 contacts (Terminals 1B - 6B of TB1) are rated at
10A @ 110VAC Resistive, 7.5A @ 110VAC Inductive, 10A @ 24V DC resistive
and 5A @ 24V DC inductive.
WARNING: Remove power from the DySC system prior to connecting any alarm
notification device. Access to the terminal contacts risks exposure to a potential
arc flash and/or electrocution hazard unless power to the switchboard is
removed.