Form No. ASI/MD-90
Revision 3 – July 2020
Page 7 of 8
NO.
DESCRIPTION
MECH. ENG.
5
Charging using CONSTANT POTENTIAL METHOD. (OFF WING)
Second Charge Only Required if Open Voltage Measured was Between 25.55
VDC and 20.00 VDC. See Figure 103 Flowchart.
If not applicable identify the columns N/A.
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.
6
ONLY If during Open Voltage Circuit Test the Voltage measured is less than
20.00VDC then perform the following procedure.
Charging using CONSTANT CURRENT METHOD (OFF WING)
Constant current charging is NOT the preferred charging method of charging the
battery and is generally only used for charging batteries that have been subject to
deep discharge (OCV less than 20.00).
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.
Record the Battery OCV __________________ Volts. (Test reading).
Turn on the DC power supply.
Set the power supply’s current limit to 3.8 +/-0.5 amperes
Set the power supply’s output voltage to 40.0 +/- VDC
Turn the power supply off.
Connect the battery to the Test Set Up and turn the power supply on. Charge the
battery at 3.8 amperes for 30 Minutes.
After 30 Minutes with the battery still charging, measure the battery terminal
voltage (charge-on voltage), compare the reading with the ‘Test reading’ that was
performed just prior to the Constant Current Charging sequence.
Record the charge – on Voltage _______________Volts.
7 This step determines if the battery has sulphated to the point of being
unrecoverable if the on-charge voltage is greater than 29.0 VDC, and the voltage
at the start was less than or equal to 22.5 VDC.
STOP the charge and reject the battery.
BATTERY REJECTED? YES / NO
Circle One
Summary of Contents for PILATUS PORTER PC6
Page 2: ...MAINTENANCE PROGRAM PILATUS PC 6 DOCUMENT NUMBER SAP 27 REISSUE 2 REVISION 1 JULY 2020...
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Page 231: ...Form No ASI MD 71 Revision 3 July 2020 Page 2 of 4 FIGURE 1...
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