In Resistive Load Operation, The Output Voltage Is Not Regular - Cebora POWER ROD 1565 Cell Service Manual

CEBORA S.p.A.

3.3.6 - In resistive load operation, the output voltage is not regular.

For the following tests use a resistive load capable of withstanding the maximum power
source current. The appropriate values are shown in the table.
Process Resistive load
resistance
TIG 0.117 ohm
MMA 0.194 ohm
OUTPUT VOLTAGE TEST ON RESISTIVE LOAD.
Turn knob (A) in max. clockwise (to maximum), and adjust the current on any accessory
connected to the connector (H) to the maximum current value.
Output terminal – power source (-) and output terminal + power source (+) = voltage and
current values as shown in the table, adjustable both with knob (A) and by adjusting on the
accessory connected to the connector (H).
♦ Correct operation.
♦ Make sure that open circuit operation is working properly, performing the OPEN-CIRCUIT
OUTPUT VOLTAGE TEST, in par. 3.3.5, if necessary.
INTERNAL CURRENT REFERENCE TEST.
Temporarily disconnect any accessories from the connector (H). Power board (11), connector
CN1, terminals 5 (+) and 1 (-) = voltage adjustable from 0 to maximum (approximately +3.9
Vdc), by turning knob (A).
♦ Check the wiring between CN1 power board (11) and CN1 panel board (16).
♦ Check the supply voltages for the panel board (16), performing the PANEL
BOARD (16) POWER SUPPLY TEST, in par. 3.3.1, if necessary.
♦ With power source off, temporarily disconnect connector CN1 on power board
(11) and check the resistance between terminals 5 and 1 of CN1 on power board
(11). Correct value = approximately 200 Kohm. If 0 ohm (short-circuit) or
>Mohm (circuit broken), check the resistive network RR2 and its connection with
CN1 terminal 5, or replace the power board (11).
♦ Replace the panel board (16).
EXTERNAL CURRENT REFERENCE TEST.
Temporarily connect an accessory with potentiometer to adjust the current at the connector
(H). Power board (11), connector CN1, terminals 5 (+) and 1 (-) = voltage adjustable from 0
up to the value set with knob (A) (max. +3.9 Vdc), by turning the potentiometer on the
connected accessory.
3.302.113
NOTE
Maximum output
current
130 Adc
130 Adc
Correct?
NO
Correct?
YES
Correct?
NO
Power source
output voltage
+15 Vdc
+25 Vdc
YES
NO
YES
Condition
Start button pressed
Power source powered
20/11/02
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