Danfoss Turbocor TTS Series, Service Manual

Page: 274 / 282

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