GE Industrial Solutions Galaxy Vector Rack Mounted Controller J85501M-1 - Manual (Page 36)

Galaxy Rack-Mounted Vector Controller J85501M-1
3 - 8 Operation Issue 2 January 2008
System
Features
Load and Battery Contactor Features and Alarms
The Vector has two distinct circuits for controlling the state of
external Load and Battery Disconnect Contactors via the LVD1
and LVD2 terminals on the BUJ1 board. External contactor
driver circuits are not required.
Each contactor can be configured as none, load, or battery.
When configured as a battery contactor:
• The contactor is open when the plant voltage is less than the
respective low voltage battery disconnect threshold.
• The contactor is closed when the plant voltage is greater than
the respective low voltage battery reconnect threshold. At
power up, the contactor is closed and there is an 18 second
delay before the controller determines the correct state of the
contactor.
When configured as a load contactor:
• The contactor is open when the plant voltage is less than the
respective low voltage load disconnect threshold.
• The contactor is closed when the plant voltage is greater than
the respective low voltage load reconnect threshold.
Additionally, there must be no active ac failure and rectifier
phase alarms, since the load would immediately disconnect
after reconnecting. At power up, there is an 18-second delay
before the load is reconnected to allow the rectifiers to walk
in.
Refer to the Alarm Descriptions section for alarms associated
with these two contactors (Contactor Open and Contactor Fail).
Refer to the associated plant documentation for information on
connecting these Load and Battery Disconnect driver circuits to
the BUJ1 terminal connection board. Figure 4-1 provides
general connection information.
Thermal Compensation Features and Alarms
The Vector has a flexible Thermal Compensation feature which
provides voltage compensation from that level established by the
Plant Float Set-Point (FSP), dependent on the highest
temperature monitored by thermistors located at the plant
batteries. Thermal Compensation should only be enabled when
the controller is used in a plant containing “sealed” or valve
regulated “maintenance free” batteries. This feature requires the