Danfoss Turbocor TTS Series Service Manual page 274

Figure B-23 Compressor Voltage Troubleshooting Flowchart (Sheet 2)
274 of 282
M-SV-001-EN Rev. G
Install DC Bus Test
Harness – Refer to
Installation of the
DC Bus Test Harness
Disconnect J2 and
J3/J4 outputs from
Re‐install Top Cover,
then re‐apply mains
Verify the DC bus
through the Test
Is DC bus voltage
Isolate power,
remove cover, test
all SCRs, and refer to
SCR Verification
Replace all three
SCRs and re‐install No SCRs pass test?
Top Cover
Replace Soft Start
and re‐install Top
A
1.9.1
J3 Potted DC‐DCs
J4 Open‐Frame DC‐DCs
DC‐DC
power
Harness
Applicable for
Potted DC‐DCs only
Verify the 15VAC
Yes through the test
correct?
harness
No
15VAC present?
4.18.2
No
Yes
Cover
Yes
B