Lucent Technologies Lineage
®
2000 ECS-6 Controller J85501D-1
2 - 8 Product Description
Issue 6 August 1998
shutdown threshold remains effective for 2-4 minutes, after
which the float high voltage shutdown threshold becomes
effective. This delay is necessary to avoid nuisance HV alarms
and shutdowns that would occur if the float threshold became
effective while the battery voltage was slowly dropping from the
equalize voltage to the float voltage. This feature is basically
transparent in normal plant operation, but could be
misinterpreted as a failure in the HV detection circuit if not taken
into account during acceptance testing or troubleshooting.
The available threshold settings correspond with the range of
float and equalize voltages that might be encountered in nominal
24V and 48V applications. A listing of the actual settings
appears on Figure 4-3 and on a label on the controller itself.
Automatic
Rectifier Restart
A high voltage shutdown from the controller is typically
followed by an automatic restart signal. When the controller
detects that one or more rectifiers have responded to its HV
signal by shutting down, there is a 3 to 5 second delay, after
which the controller issues a restart signal to all rectifiers.
Rectifiers that have shut down may or may not respond to the
restart signal, depending on the nature of the failure.
The restart signal consists of two sets of clean contact closures.
One set of closures is connected to rectifiers 1, 2, and 3. The
other set is connected to rectifiers 4, 5, and 6. In this way,
different types of rectifiers with restart circuits that are otherwise
incompatible may be combined (in groups of three) in one plant.
See also “Mixed Types of Rectifiers in One Plant” in this
section.
After the controller issues the restart closures, they stay in effect
for the next 4 to 6 minutes and then they reopen. The controller
does not issue a new restart signal in response to any additional
high voltage events in that 4 to 6 minute period. The timeout
period is intended to prevent multiple shutdown/restart cycles
during heavy lightning storms that would otherwise stress the
power equipment.
Rectifiers that have not shut down are not affected by the restart
signal from the controller and continue to run normally.
Rectifiers that have restarted in response to the signal will
resume normal operation unless lightning activity continues or
they are actually faulty units. In either case, if the plant voltage
goes high again during the 4-6 minute timeout, the shutdown
