Global S-8500, Руководство по эксплуатации

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Global Power Technologies 62
S-8500
Float Charging
A float charging application is when the TEG system will be running continuously or for long ex -
tended periods of time. The output voltage needs to be set to the float charging voltage, which
is lower than cycle charging voltage. The remote start is an option for remote SCADA controlled
starting and stopping of the TEG, in addition to on-site local operation; Auto functionality should
be turned off, since it is a cycling function. An example of float charging would be when the TEG is
run continuously over the winter season.
Cycle Charging
A cycle charge application is when the TEG system provides periodic charging to the battery sys-
tem. The output voltage needs to be set to the cycle charging voltage, which is higher than float
charging voltage. The remote start option is necessary, with Auto functionality turned on to start
the TEG at a set starting voltage associated with the battery depth of discharge and to stop the
TEG at a voltage associated with the amount of battery capacity recharged. Connect a second
temperature sensor to the TEG Controller board and also mount it on one of the battery posts. The
stop voltage set point is compensated by temperature, since battery capacity is affected by tem -
perature. The remote start option can also be used for remote SCADA controlled operation and
on-site local operation. Auto functionality operates when the TEG Controller board is in the remote
mode; see Appendix I1 for more operation details.
WARNING: If the second temperature sensor is not used, which will adjust
the auto stop voltage, then the battery may not be ideally charged according
to the manufacturer’s specifications.
The TEG can be either the primary charger in a TEG only system, or it may be the secondary
charger in hybrid system. The TEG output voltage is set to the cycle charging voltage in either
case.
The Auto Start voltage is typically set to the same value in either system; the TEG will be started
when the battery voltage has discharged down to this voltage. The life of the battery is affected
by the depth of discharge. If the auto start voltage set point is too high, this will result in the TEG
starting often.
The difference between a primary and secondary charger behavior is set by the Auto Stop set
point in the TEG Controller. The setting is application specific. The Auto stop voltage is typically
set higher for applications where the TEG is the primary charger, usually near to the cycle charg-
ing voltage. The Auto stop voltage is typically set to recharge up to a lower capacity of the battery
instead of full capacity when the TEG is the secondary charger. The TEG will be stopped when the
battery voltage charges up to this voltage.
The stop voltage is a charging voltage not a direct representation of the state of charge. The bat-
tery voltage will settle to a resting state when left without charging or discharging; to measure the
state of charge of a battery it must rest for a minimum of four hours before measuring the voltage.