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REGULATOR OPERATION
The MC-620 regulator’s microprocessor controlled charging system uses a sophisticated, multi-stage profile to deliver
maximum charging output, while protecting the batteries from overcharging damage. When the regulator is first turned on, the
processor performs a quick one-second self diagnostic assessment. Following that diagnostic, the MC-620 initiates the selected
battery charge program. Note that the Factory-set default values mentioned below correspond to the UFP battery program
which is enabled by default. The battery program is as follows.
1.
Start Delay.
Controls time between regulator activation and the start of charging. Factory set at one second. User
adjustable with dLc (See page 16)
2.
Soft Ramp.
Gently increases target voltage from current battery resting voltage to the Bulk Charge stage target at a fixed
rate of 0.16 volts per second. This stage typically takes 1-2 minutes to complete.
3.
Bulk Charge.
The most aggressive of the charging stages. Target voltage is held to a preset level for a set time period,
both of which are specified by the battery program selected. Factory-set values are 56.4 Volts for 0.3 hours (18 minutes),
and are adjustable with bv and b1c, respectively (See page 16).
4.
Calculated Bulk Charge.
Target voltage is maintained at Bulk level. The regulator calculates battery condition by
constantly monitoring field duty cycle, battery sense voltage, and an internal timer. Depending on these conditions, the
regulator will stay in Calculated Bulk stage between 2 seconds and a fixed 6 hour time limit. If the 6 hour limit is exceeded it
will automatically transition to the following stage. The field duty cycle target (FBA) is user adjustable. Factory set default is
65% (See page 17).
5.
Ramp to Absorption.
Gradually changes the target voltage from the current battery sense voltage to the Absorption
Charge stage target at a fixed rate of 0.08 volts per 7 seconds. This stage typically takes 1 minute to complete.
6.
Absorption Charge.
The alternator output is held at a set voltage for a set time period, specified by the battery program
selected. Factory-set values are 55.6 volts for 0.3 hours (18 minutes) and are adjustable with Av and A1c, respectively (See
page 16).
7.
Calculated Absorption Charge.
Target voltage is maintained at the Absorption Charge level. The regulator calculates
battery condition by constantly monitoring field duty cycle, battery sense voltage, and an internal timer. Once all conditions
are met, the regulator will transition to the next stage. The time duration of this stage is between 2 seconds and 6 hours,
depending upon battery condition. If the 6 hour limit is exceeded the regulator will automatically transition to the following
stage. The field duty cycle target (FBA) is user adjustable. Factory set default is 65% (See page 17).
8.
Ramp to Float.
Gradually changes the target voltage from the current battery sense voltage to the Float Charge stage
target at a fixed rate of 0.08 volts per 3 seconds. This stage typically takes about 1 minute to complete.
9.
Float Charge.
The alternator output is held at a preset voltage for a set time period, again, specified by the battery program
selected. Factory-set defaults are 55.6 volts for 0.3 hours (18 minutes), adjustable with Fv and F1c, respectively (See page
16 & 17).
10.
Calculated Float Charge.
Target voltage is maintained at the Float level. The regulator can respond to an increased
charge demand by reverting to the Absorption Charge stage if the conditions warrant. The battery condition is judged
by constantly monitoring field duty cycle, battery sense voltage, and an internal timer. The regulator will stay in the
Calculated Float charge stage a minimum of 2 seconds and up to 6 hours. If the 6 hour limit is exceeded the regulator will
automatically revert to the absorption charge stage. The field duty cycle threshold (FFL) is user adjustable. Factory set
default is 65% (See page 17).
1 sec. 60 sec.
18 min.
Up to 6 hrs. 18 min.
Up to 6 hrs.
18 min.
Up to 6 hrs.
18 min.
Up to 6 hrs.
18 min.
Up to 6 hrs.
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