Danfoss Turbocor TTS Series Service Manual page 273

Figure B-22 Compressor Voltage Troubleshooting Flowchart (Sheet 1)
With an appropriately rated
meter, verify all 3 phases of
voltage before the mains
All three phases of voltage
No
present after mains fuses?
Verify and, if
needed,replace
Fuses – Refer to
to Electrical Isolation
Terminal Block Fuse
Replacement 4.3
Start
Carefully remove
Mains Input Cover
fuses
Yes
Electrically isolate
compressor – Refer
1.7
Remove the Top
Cover
Inspect all
electronics for
visible damage
Are there any signs
Yes
of visible damage?
Replace damaged
components
No
Verify Soft Start
fuses (Closed‐Top
Soft Start Only)
Replace fuse and
Are the Soft Start
refer to Determining
fuses within No
the Cause of the
specification?
Blown Fuse 5.5.2.6
Yes
Verify IGBT cable to
the IGBT connectors
are installed
correctly
Verify DC‐DC
resistances
Replace DC‐DC and
bearings – Refer to
PWM Verification
M-SV-001-EN Rev. G
End
Are resistances
Yes
correct?
No
verify PWM and
4.27.3
A
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