Tyco Electronics Galaxy SC Controller J85501F-1
Appendix G - 4 Glossary Issue 13 February 2001
Coup de Fouet The initial portion of the battery discharge is known as the Coup de
Fouet, or “the whip.” During the Coup de Fouet, the plant voltage
rapidly decreases several volts, and then slowly rises. The depth of the
dip in plant voltage is dependent upon the rate of discharge, the number
of hours of battery reserve, the battery type, and battery health. Refer to
the battery product manual for information on the lowest voltage during
the Coup de Fouet.
The controller recognizes the Coup de Fouet event, based on the start of
the Battery on Discharge (BD) alarm.
Rectifier On
Threshold
The rectifier on threshold is a secondary threshold below the Battery on
Discharge (BD) threshold, that turns on all remaining rectifiers in the
Standby mode. This includes rectifiers that are turned off by the
operator, engine sequencing, or external TR signals.
The rectifier on threshold does not turn on rectifiers immediately after
the Battery on Discharge Alarm begins, because of the Coup de Fouet
or dip in plant voltage. The Coup de Fouet duration is user
programmable, and is called the Rectifier On Delay.
The rectifier on threshold should be at or below the BD alarm threshold,
and at or above the VLV alarm threshold. Refer to the battery product
manual for information on the rectifier on threshold and Coup de Fouet
duration.
Adjustable
Selective High
Voltag e
Shutdown
The controller is equipped to detect a high voltage condition on the plant
bus. Such a high voltage condition is typically caused by
lightning-induced transients on the commercial AC power lines. A
rectifier failure might, however, cause an individual rectifier to increase
its output voltage.
To prevent high voltage from damaging the connected
telecommunications load, the controller will shut down rectifiers that
deliver high voltage power.
When the controller detects an increase in the plant voltage above a
preset threshold, it immediately issues an HV alarm to the external
alarm system. HV is considered a Power Major alarm, by default.
Simultaneous with reporting the alarm, the controller sends a shutdown
signal to all rectifiers.
In addition, boost or BTP mode is terminated and the plant is
automatically placed in float mode. Since the output of all rectifiers are
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