BENCH TEST PROCEDURE: PPC- D
This procedure provides a basic bench test to check the
operation and calibration for the PPC-D. This procedure is designed specifically for
experienced electronic technicians.
Equipment
required: Digital
multimeter: 0-30 volt 500 ma power
supply
The PPC-D printed circuit board is coated with a water
resistant coating. Use a sharp pointed probe and enough pressure to pierce the
coating when making measurements.
1) Make sure there is
a jumper between BATTERY VOLT SENSE (+) and BATTERY (+) and one between BATTERY
VOLT SENSE (-) and BATTERY (-).
3) Unplug the
Temperature Compensation accessory if so equipped. Measure the resistance
between the outer and inner conductors of the temperature cable connector. It
should be between 4.46 KW and 4.95 KW at room temperature (25°C).
4) Measure the
resistance between the BATTERY (+) and SOLAR PANEL (+) terminals. It should be
open.
5) Check the diodes
connected to pins 6 and 7 of the MC1723
IC.
6) Set the power
supply to the nominal system voltage (12, 24, 36 or 48 volt), current limit to
500 ma.
7) Connect the power
supply (-) to the controller BATTERY (-) terminal. Connect the power supply (+)
to the controller BATTERY (+) terminal and to the controller SOLAR PANEL (+)
terminal.
8) Measure the
voltage at pin 11 of the MC1723 IC. It
should be about the power supply voltage.
If it is not, suspect the unit defective and return for repair.
9) Measure the
voltage at pin 6 of the MC1723 IC. It should be 7.7 +/- 0.2 volts. If it is not, unsolder and remove one
end of the diode on pin 6 and re-measure.
If the voltage is now correct, the controller should be sent in for
repair. If the voltage is still wrong, the MC1723 is bad.
10) If the controller
is in charge mode, go to step 14. If it is not, switch on and then off the
ARRAY circuit breaker. The controller should go into charge mode.
11) Measure the voltage
across the relay coil (smaller wires).
It should be between 8.0 and 13.0 volts. If it is not, suspect the 100
ohm power resistor, Xstr TIP 100(or 102).
12) Verify the
set-points by changing the power supply voltage up and down and observing the
activation.
13) Change the CHARGE
SET-POINT SELECT switch and power supply to verify other set-points. Repeat
steps 10-13. Refer to the specifications for set-point values.