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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
PCM2 is designed to monitor and to a certain extent control a direct current system that is based
on batteries, rectifiers and distribution.
The main functions are:
Monitoring of system parameters such as voltage, current, earth fault resistance,
temperature, and others.
Alarm management through analysis of own measurement data, automatic tests and
collection of data from external units.
Alarm indication in clear text on display, LED for general alarm and relay outputs for
external alarm handling.
Control of the charging process such as equalizing charging, temperature control float
charging voltage and tests with lowered voltage (battery circuit test).
Operator communications via display, push buttons and LEDs for alarm indication.
A special case is when PCM2 is only used for monitoring without the option of communications
with the rectifier. A number of rectifier dependent functions are then superfluous or have no
relevance. This is described in more detail in connection with the parameter that controls this
function, see section 5.14.4.
4.2 OPERATOR PANEL
The operator panel is the unit used as the user interface. This contains a graphic display, push
buttons, LEDs for alarm indication and an internal microprocessor. It is connected firstly to the I/O
unit via a RJ45 cable, and secondly to the rectifier via a RJ11 cable.
As an option it is possible to connect another operator panel for use in a control room, for
example.
4.3 I/O UNIT
The I/O unit contains an adapter for the external connections required for the monitoring unit. This
also contains circuits for digital inputs/outputs, measurement circuits, power supply and
microprocessor. It is connected to the operator panel via a RJ45 cable.
4.4 FUNCTIONS
4.4.1 Float charging
Float charging is the normal operating mode determined by the battery. The voltage level is set
according to the battery manufacturer instructions.
The rectifier's float charging voltage may have temperature control. This is providing that the
monitoring unit is fitted with an external temperature sensor for measurement of the battery's
ambient temperature (see section 6.4.3.4). This control is based on a number of parameters based
on information from the battery manufacturer, see section 5.13.4.
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