4-8 Operating the Drive
DC590+ Series DC Digital Drive
NEW: The new option has part number AH500935U001 and is mounted in the same manner as the
original. The connecting link wire to the control board is still required and must be connected
for operation.
It is configured by setting its 10-way switch and single 2-position switch.
Calibration of the new AH500935U001 version
On this new version of the option the full-speed tachogenerator voltage is configured by
adding
together the values from any number of the individual selection switches (on the 10-way
switch).
CALIBRATED FULL-SPEED VOLTAGE = 10V + SUM OF SWITCHES SELECTED
NOTE Individual switch values will be included if the switch is set to the right.
In the example AH500935U001 shown above (with three switches selected):
Calibrated full-speed voltage = 10V + (50V + 20V + 10V) = 90V
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:
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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