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5.3 Hall Effect Sensor Speed Adjustment
For this speed adjustment only Hall signals from the motor are sufficient.
The voltage from armature can be used as feedback when the motor doesn't have an Encoder. This mode
gives less precise operation, but is sufficient for lots of applications. (Minimum speed of 300Rpm in this
configuration) For such a configuration open solder bridge S9,close S4 and insert a RENC resistor in
accordance with the following formula:
Renc = 478000 / FHall.
WHERE:
FHall = K x RPM : 60 K = 1 For 2 pole motors
K = 2 For 4 pole motors
K = 3 For 6 pole motors
K = 4 For 8 pole motors
Example: Motor with 4 pole motor n=4000 RPM
FHall = 2 x 4.000 / 60 = 133,3
Renc = 478000 / 133,3 = 3585 Kohm
You use a resistor equal to 3,3 Mohm or 3,9 Mohm
WARNING: Be sure to take the RENC resistor off (if present). This resistor is for adjusting the encoder
scaling. This value is completely different from the formula used in Hall Effect Speed adjustment.
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