590 Series DC Digital Drive Operating the Drive
4-7
IMPORTANT
The calibrated full-speed voltage is 10V greater than the sum of switch values selected.
This AH500935U001 board continues to support both AC and DC analog tachos with a calibration range of 10 to 200V.
• For AC tacho feedback, use terminals G1 & G2, with selector switch in the AC position (left). Calibrate the switches for √2 x full-
speed voltage required, i.e. √2 x 90V = 127V. This adjusts the r.m.s. value received from an AC tacho into the required peak value.
• For DC tacho feedback, use terminals G3 & G4, with selector switch in the DC position (right).
NOTE Do not set the calibration volts to greater than 200V, the maximum terminal block rating.
Calibration for Voltages greater than 200V
For full speed tacho voltages greater than 200V, an external resistor, value RE, is required in series with
the tachogenerator connection to terminal G3.
Set the switches on the Tacho Calibration Option Board to give a value of 200V, as shown opposite.
RE then is given by the formula:
RE
(tachovolts 200)
5
k=
Ω
The power dissipation of this resistor is given by the formula
W = (tacho volts - 200) x 5 milliwatts
1
10
0
100
1 2 3 4 5 6 7 8 9 10
0 1 2 3 4 5 6 7 8 9
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