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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
For mains power failure, the battery voltage starts to drop. When the voltage
drops below
Level 1
a time measurement starts. The time, t1, when the
voltage is below this level is then measured and used to calculate the time,
t2, for the coming equalizing charging.
When the mains voltage returns, the battery voltage starts to increase.
Level2
is the limit value from which the time t2 for equalizing charging starts to be
counted.
K
is the factor used to calculate the time t2 for equalizing charging as per t2 =
K x t1. The factor can be set in the range 1 - 20. The normal value is 5. The
time t2 is limited to a maximum of 24 hours.
5.13.7
Lowest possible voltage level, Uminimum
There are a number of parameters that affect the rectifier output voltage, such
as temperature control, battery test etc. It may therefore be difficult to know
for sure how far the voltage can drop.
In order to ensure the rectifier output voltage never falls below a critical limit,
you can specify here a guaranteed minimum level. This setting then overrides
all other parameters such as the lower voltage limit for example.
5.13.8
Highest possible voltage level, Umaximum (HVSD)
This level is intended as an emergency safeguard to protect the load from
harmful overvoltage. The setting is communicated to the rectifier which then
takes care of the protection function by itself by shutting down if the limit is
exceeded (High Voltage Shut Down).
The HVSD function is selective which means that for parallel rectifier modules, only the module
that causes the overvoltage will trip. This is ensured by the individual module only tripping under
the condition that the module supplies current that exceeds around 25 % of its rated current.
Note that the charging voltage (float charging and equalizing charging) will be limited to
maximum 1% below U
maximum
even if the charging voltage is set to a higher level.
5.13.9
Parameters for RI compensation
If for some reason you decide to connect measurement conductors for the
battery voltage closer to the rectifier instead of close to the battery, you can
compensate for the consequential resistive voltage drop using the “RI
compensation” parameter. Up to 3 % voltage drop can be compensated for.
5.13.10
Parameters for external alarm
Via the input “EXT. FAULT” (see section
6.4.4.5) there is the option of
monitoring an external unit. Here you can specify the most appropriate alarm
text to use in the event of an alarm. The alternatives are,
1.
External fault
2.
Inverter fault
3.
Fault in DC/DC
4.
Alarm via alarm panel
5.
External blocking
Adjust
level1, start of
time metering
110.7V
________________________________
Ready
Adjust
level2, charge time
starts to count
121.5V
________________________________
Ready
Adjust
time factor K for
calc. of charge time
05
________________________________
Ready
Adjust
lowest permitted
voltage level
099.0V
________________________________
Ready
Adjust level
Umaximum
(HighVoltageShutdown)
129.6V
________________________________
Ready
Adjust
RI compensation
0.0%
________________________________
Ready
Select alarm text:
EXTERNAL FAULT
INVERTER FAULT
DC/DC FAULT
ALARM PANEL ALERT
EXTERNAL BLOCKING
________________________________
Ready
