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Table 7-1: Pre-Calculated Values for Vref
Motor Phase Current
(Amps)
2.0
2.5
2.8
3.0
3.5
3.8
4.0
4.5
4.7
8)
(VDC)
.688
.86
.9632
1.032
1.204
1.3072
1.376
1.548
1.6168
Adjustment of Motor Phase Current
The motor phase current is set by adjusting resistors VR1-VR6 for the voltage level
calculated from the above formula (1) or Table 3. VR3, VR4, VR6 are the coarse
adjustment resistors. VR1, VR2, VR5 are the fine adjustment resistors. See Fig.__ for
location of test points and adjustment resistors.
Figure 8-1: Adjustment of Motor Phase Current
The following steps are used to set
for each axis.
1. Calculate
for each axis using the above formula.
2. Turn on the power
3. Connect a voltmeter (set for
) between TP1 (X) and GND and adjust VR1
and VR3 for the desired voltage (
).