50
Service Manual
Plus
MICROSPEED
RDT (Kohm) = Kdt x n x 9,7 _ 8
1000 x Vref
RDT (Kohm) = 10 x 3000 x 9,7 _ 8=21.8 Kohm
1000 x 10
The drives are provided with the RDT resistance mounted on
board.The drive is adjusted for 3000 rpm with a tachometer costant
10v/1000 rpm referred to 10V reference.
If you desire to change this resistor, just open the cover of the
drive, then change the value of the resistor.
To calculate it,please use the following equation:
Example: KDT=10, n=3000, Vref=10
Where:
Rdt
is the value expressed in Kohm with a power rating of 1/8 or
1/4w.
Kdt
is the tachogenerator costant
n°
is the max speed express ed in RPM.
Vref
is the max voltage reference expressed in Volts.
When the RDT resistor is mounted adjust the fine speed by using
the VEL potentiometer located in front of the drive.
Clockwise
...............Increases the speed.
CounterClockwise
..Decreases the speed.
The range adjustments are +/- 20 %.
5.3 Speed adjustment with tacho feedback
Adjustments
VEL
BIL
ACC
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