Campbell CR3000 Micrologger, Operator'S Manual

Page: 522 / 644

Section 10. Troubleshooting
522
10.9.3.4 Adjusting Charging Voltage
Note Campbell Scientific recommends that a qualified electronic
technician perform the following procedure.
The procedure outlined in this flow chart tests and adjusts PS100 and CH100
charging regulators. If a need for repair or calibration is indicated after following
the procedure, see Assistance
(p. 5)
for information on sending items to Campbell
Scientific.
Adjusting Charging Circuit
1) Place a 5 kΩ resistor between a
12V
terminal and a
G
(ground) ground terminal
on the charging regulator. Use a voltmeter to measure the voltage across the 5 kΩ
resistor.
2) Connect a power source that supplies a voltage >17 V to the input
CHG
terminals
of the charging regulator.
3) Adjust pot R3 (see FIGURE: Potentiometer R3 on PS100 and CH100 Charging
Regulators
(p. 523)
) so that voltage across the 5 kΩ resistor is 13.3 Vdc.
Can the output voltage be set to 13.3 V?
No
Yes
50 Ω Load Test
1) Switch the power switch to
OFF
.
2) Disconnect the power source (transformer / solar panel).
3) Remove the 5 kΩ resistor
4) Place a 50 Ω, 1 W resistor between a
12V
terminal and a
G
(ground) terminal on
the charging regulator.
5) Reconnect the power source and then switch the power switch to
ON
.
7) Measure the voltage across the ends of the resistor.
Is the voltage 13.0 to 14.0 Vdc (13.3 if circuit just adjusted)?
8) Switch the power switch to
OFF
.
NOTE The resistor will get HOT in just a few seconds. After measuring the voltage,
switch the power switch to
OFF
and allow the resistor to cool before removing it.
Get Repair Authorization
The charging regulator is damaged and should be repaired
or replaced.
No
Yes
Test Completed
The charger is functioning properly. Remove the 50 Ω resistor.