Campbell Scientific CR1000KD CR800 and CR850 Measurement and Control Systems - Page 419
Adjusting Charging Voltage
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Section 10. Troubleshooting Charging Regulator with ac or dc Transformer Test Disconnect any wires attached to the 12V and G (ground) terminals on the PS100 or CH100 charging regulator. Unplug any batteries. Connect the power input ac or dc transformer to the two CHG terminals. Polarity of the inputs does not matter. Only the transformer should be connected. Set the charging-regulator power switch to OFF. Connect the transformer to mains power. Transformer Test Determine whether the transformer output is ac or dc voltage (labeling on the transformer usually identifies the output voltage type). Set a voltmeter to read that type of voltage. Measure transformer output across the two transformer leads by No placing a voltmeter lead on one CHG terminal, and the other lead on the other CHG terminal. Is the output 17 to 22 volts? Yes Taking care not to short the transformer leads, remove the leads from the charging regulator. Measure transformer output across No the two leads. Is the output 17 to 22 Vac / Vdc? Yes Reconnect the power source (transformer / solar panel) to the CHG terminals on the charging regulator. Measure the voltage No between the two CHG terminals. Is the voltage ≥ 17 Vdc / Vac? Yes The transformer is damaged and should be replaced. 5-kΩ Load Test 1) Place a 5-kΩ resistor between a 12V terminal and a G (ground) terminal on the charging regulator. 2) Switch the power switch to ON. No 3) Measure the DC voltage across the resistor. Is the measured voltage 13.3 to 14.1 V? Yes Measure the voltage between the two pins in a battery-connection receptacle. Is the voltage 10.0 to 15.5 Vdc? 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-Watt 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. No 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. Yes See Adjusting Charging Voltage (p. 419) to calibrate the charging regulator, or return the charging regulator to Campbell Scientific for calibration. Obtain Repair Authorization The charging regulator is damaged and should be repaired or replaced. Test Completed The charger is functioning properly. Remove the 50-Ω resistor. 10.5.3.4 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 Warranty and Assistance (p. 3) for information on sending items to Campbell Scientific. 419