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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
that are normally supplied.
If the supplied cables need extending, there are no special requirements for cables and junction
boxes in addition to normal electrical installation directives.
6.4.3.3 Earth fault measuring
Measurement of the monitored earth point is done with high ohms (> 200 kΩ). This resistance
keeps the earth point floating at half the battery voltage providing no earth fault occurs.
The monitored earth point is connected to input X7:2 “E.F.”.
NOTE: For EMC reasons, the monitored earth point must be located on the inside of the enclosure
where the I/O unit is located.
6.4.3.4 Battery temperature
Measurement of the battery temperature is done via an enclosed Pt-1000 sensor. It is used both to
monitor the temperature level and for temperature control of the float charging voltage. As the
sensor is a Pt-1000 model, bipolar measurement is sufficient, as opposed to the more common Pt-
100 which often needs four-pole measurement to ensure that conductor resistance does not
impact negatively on the measurement results.
Place the sensor where it best represents a mean value for the battery temperature.
Connect the sensor to input X9:1-2 “TEMP SENSOR”.
If the sensor cable needs extending, there are no special requirements for cables and junction
boxes in addition to normal electrical installation directives. The insulation class is determined by
the battery voltage.
The temperature sensor is an option and is therefore only installed where applicable. Check that
the parameters for temperature measurement are correctly set, see section 5.13.4.
6.4.4 Digital inputs
6.4.4.1 General
Closed input is the normal condition Open input is activated condition. This means that the inputs
that are not connected must be strapped instead!
WARNING! The digital inputs are powered from the rectifier's internal auxiliary voltage (around
12VDC). They must be connected to potential-free contacts only.
6.4.4.2 Blocking of equalizing charging
With the input “EQ. BLOCKED” in open position, equalizing charging is blocked. May, for
example, be used to prevent equalizing charging via a flow guard if the battery compartment's
evacuation fan is not working, or to prevent equalizing charging with a connected load.
Connect to input X9:3-4 “EQ. BLOCKED”.
6.4.4.3 Fuse monitoring
With the “FUSE FAULT” input in open position, the Distr.fuse fault is activated. Through series
connection of the auxiliary contacts (that break on alarm) any number of fuses can be monitored.
Connect to input X9:5-6 “FUSE FAULT”.
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