Eaton EFX48 e-Fuse Series - Page 97

EFX48 e-Fuse System Operation
Copyright © 2019 Eaton Corporation. All Rights Reserved.
IPN March 2019
97
When the ac has returned after an outage the following conditions need to be met before a fast
charge is allowed :
Fast Charge Qualification Conditions Must be true
System AC fail alarm condition not active

Fast charge is enabled

No strings pending or tripped

Equalisation is not being performed

Rect fail alarm or Multi rect alarm condition not active

Rectifier Comms alarm condition not active

System Overcurrent alarm condition not active

System Overload alarm condition not active

Bus voltage on return of AC must be less than the trigger
threshold voltage

If Fast Charge is enabled and a string is tripped or rectifier single/multiple comms lost
state is active then the fast charge is prevented; the fast charge is not performed and a
time/date stamped entry entered in the Event Log.
If the conditions for the Fast Charge are met, a time/date stamped entry is entered in the
event log, the rectifier voltage is raised to the fast charge voltage and kept there until either
the maximum time duration is reached or the bus voltage is at the fast charge voltage and
charge current has reduced to the terminate current setting, at which point the fast charge
ends, the bus voltage is returned to the normal float voltage, and a time/date stamped
entry is entered in the event log. The fast charge active condition will be active during the
test, and if configured the fast charge active alarm will be present.
If during a fast charge any string button state is changed, ac fails, fast charge is disabled,
the system overcurrent alarm becomes active, a string trips or any rectifier fails then fast
charge is terminated, a time/date stamped entry entered in the event log and the process
will wait for the qualifying conditions to be met and the fast charge process to become
active once more.
The reported ‘battery Fast Charge State ‘ will be off if fast charge is disabled and if enabled
will be waiting /active /prevented /aborted /failed /complete with
prevented/aborted/failed/complete held for 1 hour after being set unless the fast charge
enable state is toggled from on to off to on, or another fast charge is started after which it
will return to waiting/active.
During fast charge the system high float and high load alarm thresholds are both raised
above the fast charge voltage setting by the difference between fast charge level and
nominal bus voltages. On completion of the fast charge process the thresholds are held at
that level until the bus voltage is 0.25V less than the unforced high float setting.