7200 TROUBLESHOOTING
E - 6
5.0 Resolver Errors
For all resolver errors, check the cable first and make sure that D-subconnector is
securely connected to the back of the ACU. Also verify that shield lines are
connected to the ACU, but OPEN at the resolver. Shield lines should not short to
each other. [Refer to Table 4-4 (in Section 4.0 of this manual) to ensure that
shielding pairs are installed correctly.]
The following resolver DC resistance readings are listed as a checklist. It is
important that the S lead pairs match each other. If measuring from the D-
connector end, there will be some extra cable resistance.
• Two-speed:
- R1-R2: 17 ohms
- S1-S3: 152 ohms
- S2-S4: 152 ohms
- S11-S13: 562 ohms
- S12-S14: 562 ohms
• Standard (2500 Hz @ 4.4 V RMS)
- R1-R2: 19 ohms
- S1-S3: 6.8 ohms
- S2-S4: 6.8 ohms
• High accuracy (400 Hz @ 11.8 V RMS)
- R1-R2: 120 ohms
- S1-S3: 475 ohms
- S2-S4: 475 ohms
5.1 Resolver Readout Bobble
If the resolver readout bobbles, especially in the last few bits on the RDC status
display, there may be insufficient excitation voltage (this problem is common with
the two-speed resolvers). Use an oscilloscope to measure the AC component on
the S2 or S3 lead (it is recommended that the bottom of the appropriate transient
suppressor be used as a tie point; refer to the appropriate drawing in Section 8.0).
As the spatial angle of the resolver shaft changes, the sine wave should peak at 2
V RMS [5.65 V peak-to-peak (p-p)]. Higher voltages will cause saturation of the
RDC's and should be avoided. Lower voltages will reduce the signal to noise level.
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