Kikusui PAD-L III Series, Operation Manual

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PAD-L Maintenance 6-7
Mechanical zero of the voltmeter
3. Check that the POWER switch is OFF.
Mechanical zero adjustment is carried out with the POWER switch turned OFF.
4. Set the voltmeter pointer to "0" using the voltmeter zero-adjustment.
The voltmeter zero-adjustment is located below the voltmeter for TYPE III and
IV models and in the voltmeter for TYPE V models.
Warm-up
CAUTION
• Perform the warm-up with the cover in place. Applying power to
the unit for extended periods with the cover removed weakens the
cooling effect, potentially causing a failure.
5. Turn on the POWER switch.
6. Set the output voltage to the rated output voltage.
Warm up the unit, including the DVM, for an adequate period.
Removing the cover
7. Turn off the POWER switch, then turn off the switch for the switchboard.
8. Remove the cover. See 6.3.3 "Removing the cover".
Output voltage offset
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
NOTE
• On shipment from the factory, the output voltage offset is set so that a slight
negative voltage (approximately 0.2% of the rated voltage) is generated when
the V.
OS
variable resistor is turned to the extreme counterclockwise position,
in order to ensure 0 V output. If this voltage does not present problems, turn
the V.
OS
variable resistor on the front panel to the extreme counterclockwise
position and proceed to the next adjustment item.
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
9. Turn on the switch for the switchboard, then turn on the POWER switch.
10. Turn the VOLTAGE setting knob to the extreme counterclockwise
position.
11. Adjust the V.
OS
variable resistor on the front panel so that the DVM
displays 0 V.
Maximum variable range of constant voltage
12. Turn the VOLTAGE setting knob to the extreme clockwise position.
13. Adjust the RV20 variable resistor on the PCB A-200 so that the DVM
reading becomes the maximum voltage value shown in Table 6-1.
See Figs. 6-5, 6-6, and 6-7.