SusiAir PILATUS PORTER PC6, Maintenance Program

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Form No. ASI/MD-90 Revision 3 – July 2020 Page 5 of 8
NO. DESCRIPTION MECH. ENG.
5 Charging using CONSTANT POTENTIAL METHOD. (OFF WING)
Constant Potential Charging Method is the preferred method of charging the
battery and is used for normal recharging of batteries that have NOT been
subjected to deep discharge (an OCV less than 18 VDC).
Prior to connecting the battery, ensure that the power supply is OFF, set up the
equipment as shown in Figure 102, Charging Test Equipment Set up.
Turn on the DC Power Supply. Set the power supply’s current limit to the value
shown in Table 103 that corresponds to the desired charge time. Set the power
supply’s output voltage to 29.0 +/- 0.3 VDC.
Connect the battery to the Test Set Up and turn the power supply on. Charge the
battery until the charge current drops below 0.5 amperes.
*Alternatively, the battery may be charged for a fixed period of time that is
dependent on current limit set point of the power supply as indicated in Table 103
Below (e.g.10 Amperes for 8 Hours duration).
When the charge current drops below 0.5 amperes, *or the minimum charge time
specified below has been satisfied, remove the battery from the test set up. Allow it
to stand with no further charging or discharging activity for at least 4 hours before
conducting any further tests.
*Table 103. Current Limit Minimum Charge Time
Current Limit Set Point Minimum Time Required
40 amperes and above < 5 Hours
20 amperes 7 Hours
10 amperes 8 Hours