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Chapter 11
Troubleshooting
11-10
Table 11.E
Test Point Descriptions
Test Point
Description
TP2
Resolver:
TP7
Triangle:
TP8
PWM B:
TP9
PWM A:
TP10
PWM C:
TP11
+5V DC
TP12
Signal Common
TP13
+12V DC
TP14
–12V DC
TP15, 16
IALPHA and IBETA:
TP17
IT Ref:
TP19
Buffered Output:
TP20
Buffered Output:
TP21
Ext Current Limit:
TP28
Signal Common
TP29, 30
IA, IB Feedback
TP31
Signal Common
TP50
ABS Rotor:
TP51
9V Ref:
TP52
Microprocessor Reset:
TP40
Sine (wt):
TP41
Sine (wt) Sine (theta):
TP42
Sine (wt) Cosine (theta):
TP60
Display Reset:
TP61
Test Result:
8.000 kHz sine wave 3.0V RMS
Triangle oscillator 2.5kHz , 5.5 volts peak
Phase B transistor turn on signal
Phase A transistor turn on signal
Phase C transistor turn on signal
Sinusoidally varying DC level representing the current
command to the current loop scaled for 2.5V peak =
rated motor current
Voltage representing current reduction amount
Velocity input
Torque input
Indicates the external current limit command
(3V = rated)
Buffered motor current feedback signals scaled for 2.5
volts peak = rated motor current
Signal used to detect resolver loss. Nominal value =
2.596V. Trip point is approximately 0.8V.
Signal feeding output d/a's reference
Momentarily ground to reset microprocessor
4.0 kHz 2.0 Vrms sine wave used for A Quad B
2.0 Vrms modulated waveform used for A Quad B
2.0 Vrms modulated waveform used for A Quad B
Ground to reset display microprocessor
Indicates a pass or fail result from a self test initialization
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