7.UNITS B-70315EN/02
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7.6.2 Leakage Check and Discharge Aging
(1) See the oil window of the turbo blower to check whether the oil
level is in the 3/4 position between Hi and Low.
(2) Check for leakage.
(3) Perform discharge aging.
7.6.3 Adjusting the Oil Level Detection Signal
Follow the procedure below to make signal settings:
(1) Turn trimmer VR1 counterclockwise to the extreme end.
(2) Start the oscillator, perform internal discharge with the rated
output for 15 minutes, then place the oscillator in the base
discharge state.
(3) Measure the oil level output voltage Vso between VL1 and 0 V
(GND).
(4) Turn trimmer VR1 clockwise, and check that alarm No. 4106 is
issued, indicating turbo oil shortage.
(5) Monitor voltage Vc between VA1 and 0 V (GND), and set the
alarm level by adjusting trimmer VR1 so that the Vc value
satisfies the following equation:
Vc = Vso × 0.778
(6) Press the reset key of the CNC, and check that the alarm is reset.
(7) For the adjustment of the second turbo blower, replace VA1 and
VL1 with VA2 and VL2 in the above procedure, respectively.
Fig.7.6.3 Layout on the turbo PCB
VR2 VA2
VL2
0V
VR1 VA1 VL1