Lucent Technologies Lineage
®
2000 ECS-6U Controller J85501E-1
Issue 4 August 1998
Product Description 2 - 9
113A2. DIP switches provide a visual verification of the
shutdown set point at all times.
For plants configured with the float/equalize feature, a separate
high voltage shutdown threshold is used when the plant is in
equalize mode. A separate group of DIP switches is used to
select the HV shutdown threshold for equalize mode. When the
plant is switched from float to equalize, the equalize high voltage
shutdown threshold becomes effective immediately. When the
plant is switched from equalize to float, the equalize high voltage
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.
For FT-Series G applications of the boost charge panel, the HV
float and equalize thresholds should have the same setting (see
“Boost Charge Circuit” in this section and Section 4, “Optional
Boost Charge Panel”).
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 4-6 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 and whether
or not the rectifier can accommodate the restart signal. The
restart signal consists of six sets of isolated contact closures, one
set of closures for each rectifier.
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 4-6 minute period. The timeout period