Tyco Electronics Galaxy SC Controller J85501F-1
7 - 29 Feature Descriptions Issue 13 February 2001
threshold. The Galaxy SC can perform load shedding with two different
voltage disconnect contacts.
Low Voltage
Battery Disconnect
(LVBD)
The low voltage battery disconnect feature disconnects the battery
sections associated with a contactor, when the plant voltage drops below
a user programmable disconnect threshold. The battery sections are
reconnected when the plant voltage is at or above the user
programmable reconnect threshold.
In addition, there is a high temperature disconnect threshold that is also
associated with battery contactors. With the intelligent controller,
battery sections can be created and associated with a disconnect
contactor, and a temperature. If any battery section temperature is higher
than the high temperature disconnect threshold, than that particular
battery disconnect contactor is opened. If the intelligent controller is not
present, or battery sections, or temperatures for battery sections are not
defined, the universal battery temperature probe is automatically
associated with the contactor. The contactor is closed when all battery
section temperatures associated with the contactor are at least 3 degrees
Celsius below the disconnect threshold.
If there are two battery disconnect contactors, the operator can
optionally open one contactor for battery maintenance. The operator can
then close the contactor, when maintenance is completed.
The operator can select any combination of contactor types or contactors
associated with UR1 and UR2.
When a contactor is defined as a battery or load contactor, the user
programmable alarms associated with contactor are immediately
disabled, and if applicable, a User Relay Conflict Warning is created.
The alarm is cleared when all alarms are disassociated with contactor.
The following items are associated with the LVD feature:
type BATTERY - contactor is a LVBD contactor
LOAD - contactor is a LVLD contactor
NONE - for contactor 1, UR1 may be used with
user programmable alarms
for contactor 2, UR2 may be used
with user programmable alarms
status CONNECTED - The contactor is closed.
CONNECTED(FAILED) - The contactor is
open, but was commanded to be closed.
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