17 – 256 HEIDENHAIN Service Manual iTNC 530
17.1.2 UV 105, UV 105 B
Possible
causes of error
Supply voltage to U and V missing
Fan has failed
Fuse on board of the UV 105 (B) released
UV 105 (B) defective
DC-link voltage missing
Fuse on the protective PCB has blown
(connected to the conductor bar of a Simodrive system)
Troubleshooting
UV 105 (B)
When checking the UV 105 (B) power supply unit, proceed as follows:
Control of the LED
READY UV
The LED READY UV on the front panel of the UV 105 B indicates the readiness of the unit.
5 V on auxiliary
terminal
8 Measure whether the 5 V voltage on the auxiliary terminal of the UV 105 (B) is available.
Function of the
fan
8 Check, whether the fan of the UV 105 (B) is running.
If it does not, this might indicate that ...
No supply voltage for the UV 105 (B) is available.
Fuses in the UV 105 (B) have released.
The UV 105 (B) is defective.
The fan itself might be defective.
Checking the
supply voltages
8 Measure carefully, whether 400 Vac ±10 % are available on U and V of connector X31 (on the
bottom of the UV 105) or the connector on the front panel (UV 105 B).
8 If connected:
Measure carefully, whether a dc-link voltage on the conductor bars of the UV 105 or on the
connector on the front panel of the UV 105 B is available (the voltage depends on the inverter
system).
Danger of electrical shock!
High voltages and currents
If you have the HEIDENHAIN test adapter with the corresponding ribbon cable, you can
connect it parallel to the 50-line ribbon cable of the UV 105 (B) and measure the
corresponding low voltages.
See “Test Adapter” on page 29 – 562.
See “X69: NC power supply and control signals” on page 27 – 481.
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