112 of 132
M-SV-001-EN Rev.E
• If all voltages are within (+/- 10%) the PWM is
draining energy.
• If any of these voltages are not within (+/- 10%)
another component is draining energy.
Troubleshooting
4.5.2.4 Determining
if Inverter is Draining
Energy
4.5.2.5 Determining if
Compressor I/O Board is
Draining Energy
4.5.3 Determining the
Cause of Blown Soft Start
Fuses
1. Remove the Service Side Cover.
2. Test the Backplane voltage at the +24V test
point.
3. While measuring the +24V test point voltage,
give the compressor the demand to run.
• If the +24V reading drops below 22VDC at
the moment the demand to drive is given, the
Inverter is faulty.
• If the +24V reading does not change at the
moment the demand to drive is given, another
component is draining energy.
See Section 3.15.3.1.
1. Verify the Soft Start fuses (see Section 3.4.3.2).
2. An open F1 fuse may indicate a problem with
the DC/DC.
a. Using the DC Bus Test Harness, verify the DC/
DC Converter high voltage input (see Section
3.9.3.1).
b. Verify the DC/DC Converter (see Section 3.9.3).
c. Verify the PWM (see Section 3.16.3).
d. Verify the bearings (see Section 3.17.3).
3. An open F2 fuse may indicate a problem with
the DC/DC Converter.
• Verify the DC/DC Converter 15VAC input
resistance (see Section 3.9.3.3).
4. An open F3 fuse may indicate a problem with
the Soft Start Circuit Board.
a. Verify the SCRs and SCR gates. (see Section
3.5.3).
b. Replace the fuse.
c. Reapply power.
d. If the fuse fails again, replace the Soft Start.
5. An open F4 or F5 fuse may indicate a problem
with the Soft Start Transformers, Soft Start Circuit
Board, or DC/DC Converter.
a. Verify the DC/DC 15VAC input resistance (see
Section 3.9.3.3).
b. Verify the SCRs and SCR gates (see Section
3.5.3).
c. If no faulty component is identified, replace the
fuse and reapply power.
d. If the fuse fails again, replace the Soft Start (see
Section 3.4.4).
NOTE
Refer to Section 3.4.3 for details on verifying Soft Start fuses.
NOTE
When replacing the F3 Nano fuse, use the original rated fuse or higher, up to the 1.0A Nano fuse, on all Soft Start versions. Do not
use a lower rated fuse than the original.
Summary of Contents for Turbocor TT-300
Page 2: ...THIS PAGE INTENTIONALLY LEFT BLANK...
Page 4: ...4 of 132 M SV 001 EN Rev E THIS PAGE INTENTIONALLY LEFT BLANK...
Page 12: ...12 of 132 M SV 001 EN Rev E THIS PAGE INTENTIONALLY LEFT BLANK...
Page 61: ...61 of 132 M SV 001 EN Rev E Compressor Components Figure 56 Stator Thermistor R T Curve 1...
Page 120: ...120 of 132 M SV 001 EN Rev E THIS PAGE INTENTIONALLY LEFT BLANK...
Page 130: ...130 of 132 M SV 001 EN Rev E Notes...
