Manual

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 97
CGCM Unit Configuration Chapter 4
Dead Bus Limits
The dead bus limits define the acceptance windows for generator frequency and
voltage used by the CGCM unit when closing the breaker into a dead bus. The
following Configuration tab fields specify the acceptance windows. These fields
set the related tags in the Configuration table.
• Min Frequency - Tag DeadbusGenFreqLoLimit, expressed in Hertz
• Max Frequency - Tag DeadbusGenFreqHiLimit
• Min Voltage - Tag DeadbusGenV_LoLimit, expressed in volts
• Max Voltage - Tag DeadbusGenV_HiLimit
Rotation
• Generator – Specifies the generator phase rotation. Configuration table
tag GenRotABC_ACB_Select stores this value. 0 = ABC, 1 = ACB
• Bus – Specifies the bus phase rotation. Configuration table tag
BusRotABC_ACB_Select stores this value. 0 = ABC, 1 = ACB
IMPORTANT
Table 4 provides a guide for adjusting phase offset for wiring
configurations shown in Chapter 2
, Installation. Other wiring
configurations are possible. It is your responsibility to determine and
verify phase offset values for wiring configurations that are not depicted
in this manual.
Table 4 - Phase Offset Guide
Generator Bus Phase Shift Offset in CGCM Synch Tab
Single phase (line-to-line) Dual breaker (line-to-neutral) -30
Single phase (line-to-line) Four-wire wye -30
Open delta Dual breaker (line-to-neutral) -30
Open delta Four-wire wye -30
Three-wire wye Dual breaker (line-to-line) -60
Three-wire wye Dual breaker (line-to-neutral) -30
Three-wire wye Four-wire wye -30
Four-wire wye Dual breaker (line-to-line) -30
Four-wire wye Single (connected line-to-line) 30
Four-wire wye Open delta 30
Four-wire wye Three-wire wye 30
IMPORTANT
Prior to Host FRN 4.9, regardless of the setting of the
DeadbusGenFreqLoLimit parameter, the CGCM unit disables
synchronization when the generator frequency is below 45 Hz.