EnForcer™ SCR Service Manual I.B. 1561
21
You can check the battery voltage during start rate on a discharged battery. The battery voltage should gradually
increase to 2.37 volts/cell (v/c) with the charging current at 16% of the charger nameplate rating. Example: If you are
using a 550 AH charger, the charging current during start current mode will be 16% of 550, which is 88 amperes.
The output voltage at the battery terminals can be checked during constant voltage mode. The battery voltage should be
steady at 2.37 v/c ± 1%, and the charge current should gradually decrease.
The battery voltage can be checked during finish current mode. The battery voltage should measure at least 2.37 v/c at a
constant current of 4.5% of the charger nameplate rating.
Termination Methods
There are five choices for termination methods. These termination methods apply mainly tor flooded batteries with the IEI charge
profile.
1. dvdt
2. Time-voltage
3. Both dvdt or time-voltage (whatever occurs first)
4. Proportional
5. amp-hour
dvdt
The dvdt termination algorithm looks for a flattening of the battery voltage after the charge cycle enters into finish rate. In particular,
when the battery voltage does not increase greater than 10 mV/cell over a 30 minute period, the dvdt requirements are satisfied. The
minimum time for dvdt termination is 50 minutes after gassing voltage is reached. Please note that the above values are default charger
values and can be adjusted by modifying the service parameters extended dvdt and delta voltage dvdt.
Time-Voltage
A set time-after-gassing voltage period that charge cycle terminates. The default value in service parameters is 5 hours.
Both
Charge cycle completes when either time-voltage or dvdt termination methods, as described above, occurs.
Proportional
Charge cycle completes when the time after gassing reaches a set percentage of the start rate time before gassing. The default
setting in service parameters is 40%. As an example, the charge cycle will terminate when the time after gassing is 40% of the start rate
time.
Amp Hour
Charge cycle completes after set amount of amp-hours returned are reached. Note that an amp-hour return of greater than 150%
of charger nameplate amp-hours will result in a high amp-hour fault.
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