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32 Functional description
UM5C05C P0745680 Standard 6.00 October 2001 Emerson Energy Systems
4.1.3. Monitoring and control circuits
The monitoring and control circuits offer the following characteristics :
• soft start
• rectifier fail alarm ( RFA )
• control for local and remote equalize ( EQL )
• temporary release ( TR )
• thermal shutdown ( THSD )
• input ac monitoring
• local and remote high voltage dc shutdown ( HVSD )
• local and remote HVSD reset
• fan failure detection
4.1.4. Output capacitors
The output capacitors will be completely discharged ( < 2 V ) two minutes
after the ac power has been removed and the rectifier has been
disconnected from the batteries or the parallel rectifiers.
4.2. Description of the front panel
4.2.1. Breakers
DC circuit breaker
A dc circuit breaker is provided to protect against current overload and to
manually disconnect from the power plant.
When the breaker is in the 0 ( OFF ) position, an RFA is triggered and the
remote sense leads RG+ and RC– are internally disconnected. The rectifier
will continue to operate, allowing the adjustment of the FLT, EQL and
HVSD set points.
AC breaker
The input ac circuit breaker can be used to locally turn the rectifier ON or
OFF. The local ON / OFF control overrides any remote control signals
( for example, TR ). Putting the breaker to OFF causes an RFA to be
issued and the RFA LED to light up, as long as the rectifier output is
connected to batteries.