SC300 Handbook
34
Copyright © 2007-2018 Eaton Corporation. All Rights Reserved.
IPN 997-00012-03 B2 Issue B2 July 2018
Configuration
Set the following parameters.
Parameter Description Where to find:
Fast Charge
Voltage
The SC300 will charge the batteries at up to this
voltage until the end of fast charge.
SC300: Control Processes >
Fast Charge
DCTools/Web: Control
Processes > Fast Charge
Boost If this is enabled, the SC300 will set rectifiers
elevated charge voltage until the Fast Charge
Voltage is reached. This provides for a slightly
faster recharge.
Voltage Threshold If the bus voltage drops below this value during
an ac supply failure, then Fast Charge starts when
the ac supply is restored. Fast charge can also be
started based on the Start Ah Threshold.
Start Ampere
Hours Threshold
If Ah Discharged exceeds this value during an ac
supply failure, then Fast Charge starts when the
ac supply is restored. The threshold is given as a
percentage of installed C10 battery capacity. Fast
charge can also be started based on the Voltage
Threshold.
Recharge
Percentage (%)
The ratio of ampere-hours recharged to the
ampere-hours discharged. Fast Charge stops
either when the Ah recharged equals the Ah
discharged x Recharge Percentage, or after
Maximum Duration. Recharge Percentage only
applies if Stop Ah Threshold is set to zero.
Maximum
Duration
Set Maximum Duration so that the battery will
fully charge but not overcharge.
Stop Ah Threshold This value is set so that Fast Charge will stop
before the battery is fully charged. This is used
when Fast Charge is used to control a generator
and the generator should be stopped before the
battery is fully charged (thereby saving fuel).
Stop Ah Threshold is the discharge percentage at
which the charging stops, e.g. 10% means that
Fast Charge will stop when the battery is 90%
charged. If Fast Charge is not used to control a
generator then this value should be set to zero.
Battery Capacity The rated 10 hour capacity of the installed
battery strings. Zero means no battery is
installed.
SC300: Battery > Battery >
Battery Capacity
DCTools/Web: Batteries
Fast Charge may also be used to trigger the Generator Control Output. See details on page 78.
To avoid excessive fuel use or shortened battery life, it is important that the settings are correct in
a hybrid generator/battery power system (cyclic charge/discharge).
• Voltage Threshold should be set so that when a fully charged battery is
discharged, the Start Ah Threshold is reached before the Voltage Threshold.
• Maximum Duration should be set so that in a typical recharge, Ah Discharged
reaches zero before Maximum Duration is reached.
• Master Configuration files will typically meet these requirements, but the values
must be checked against battery discharge/recharge curves in the cyclic
application.
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