4.24.2.3 Input Resistance Measurement
1. Isolate the compressor power as described in Section 1.8 Electrical Isolation on page 22.
2. Unplug all connectors to the DC-DC Converter.
3. Using a multimeter set for resistance measurements, place the multimeter leads in the J1, HV DC input
plug terminals. Refer to Figure 4-229 Potted DC-DC on page 206 and Figure 4-230 Open Frame DC-DC
on page 206. The result should not be 0.0Ω. The result can be open (infinity) or >150kΩ depending on
the polarity of the test leads.
4. Reverse the multimeter leads on the J1 plug terminals. The result should not be 0.0Ω. The result can be
open (infinity) or >150kΩ.
5. In the Potted DC-DC, Place the multimeter leads in J4, 15VAC input terminals. The result should be
>1MΩ.
NOTE
l
J4 (15VAC input) is only for the Potted DC-DC Converter
l
If resistance is low, allow time for it to rise
6. Reverse the multimeter leads on the J4 terminals. The result should be >1MΩ.
4.24.2.4 Output Resistance Measurement
1. Isolate the compressor power as described in Section 1.8 Electrical Isolation on page 22.
2. Unplug all connectors to the DC-DC Converter.
3. Using a multimeter set for resistance measurements, place the multimeter leads on the J2, 250VDC
output terminals. Refer to Figure 4-229 Potted DC-DC on page 206 and Figure 4-230 Open Frame DC-
DC on page 206. The result should be a rising or falling value, not static, zero, or infinity.
4. Reverse the multimeter leads on the J2 (250VDC output ) terminals. The result should be a rising or
falling value, not static, zero, or infinity.
5. Place the multimeter leads in the middle row of the J3, 24VDC output terminals for the potted DC-DC
Converter or J4 for the open frame DC-DC Converter. Refer to Figure 4-228 J3/J4 - 24VDC Output
Connector. The result should be a rising or falling value, not static, zero, or infinity.
Figure 4-228 J3/J4 - 24VDC Output Connector
6. Reverse the multimeter leads on the 24VDC output terminals and measure the resistance. The result
should be a rising or falling value, not static, zero, or infinity.
NOTE
Should the output resistances show unexpected values, re-verify each output more than once. The best verification is identifying the
correct Output Voltages are present when Input Voltage is correct.
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Summary of Contents for Turbocor TT Series
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