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KraftPowercon Sweden AB, Hjalmar Petris väg 49, S-352 46 Växjö, Sweden, Tel: +46 470-705200, Fax: +46 470-705201,
www.kraftpowercon.com
4
FUNCTIONAL DESCRIPTION
4.1
GENERAL
PRX3 is a complete charging rectifier equipped with up to six rectifier modules of the type
PRM3 working in parallel with three-phase mains power feeding. The monitoring unit PCM2 is
built in for monitoring of both rectifiers, battery and other parts of the complete DC system. For
each rectifier module there are fuse links for both AC and DC that can be used as disconnection
for safe and easy maintenance and service.
Most of the function is associated with the monitoring unit which is described in the
Manual for
monitoring unit PCM2
. Only functions added on rectifier system level are discussed in this
section.
4.2
RECTIFIER MODULES
4.2.1
General
Only functions related to the rectifier module itself are specified here. For information about
general functions, see the
Manual for monitoring unit PCM2
.
4.2.2
Maneuvering and indications
The front panel holds pushbuttons for maneuvering and a number of indication
lamps.
There is no built-in mains breaker in the module. Instead, there is an ON-button
and a STBY-button, where STBY means that the module is turned off by being
put into a standby mode. The ON and STBY states are saved in a non-volatile
memory which means that even after a total main outage, the module will return to the state
that was present at the moment of the outage.
For detailed description of the front panel functions, see section 5
4.2.3
Voltage control
At normal operation, the rectifier module will regulate the output voltage according to a
setpoint provided by the monitoring unit.
The voltage reported from the module to the monitoring unit is measured on the “inside” of the
modules output blocking diode. Due to the diode voltage drop, it will therefore be slightly
higher than expected. The difference is dependent of the output current, but its size is about 1
V. The output voltage however, will always be correct because the monitoring unit measures
the voltage directly in the battery distribution board. By regulation of the setpoint, voltage drop
in both output diode and cables are compensated.
In case of an interruption of the communication between the module and the monitoring unit,
the module will continue with the last valid setpoint.
