Lucent Technologies Lineage
®
2000 ECS-12 Controller J85501D-2
2 - 8 Product Description
Issue 3 August 1998
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.
The high voltage alarm contacts can be tested by pressing switch
SW104 (see Figure 4-2 for location). When SW104 is pressed,
the HV, PMJA, PMJE, and PMJV alarms on the office alarm
terminal blocks are activated, the NORM LED on the front panel
is extinguished, and HV is sent to the CP2 Microprocessor
Option Board if the controller is so equipped. The alarm remains
as long as the switch is held, and normal operation resumes when
the switch is released. This test switch does NOT send an HV
signal to the rectifiers, so no rectifiers will be shut down, and the
rectifier restart signal will NOT be issued.
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, 3, 7, 8, and 9.
The other set is connected to rectifiers 4, 5, 6, 10, 11, and 12. In
this way, different types of rectifiers with restart circuits that are
otherwise incompatible may be combined (in groups of six) in
one plant. Different rectifier types may not be mixed within one
group of six rectifiers. See “Mixed Types of Rectifiers in One
Plant” in this section for further details.
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.
