4-6 Operating the Drive 590 Series DC Digital Drive
Analog Tacho Calibration Option Board
NOTE This option is not required if armature voltage or encoder feedback is to be used.
The board fits on to a 10-way connector. It also requires the connecting link wire to the control
board. This link is inherent but must be connected for operation.
The board supports AC and DC analog tachos with a calibration range of 10 to 209V (see note):
• For AC tacho feedback, use terminals G1 and G2 with the selector switch in the AC position.
• For DC tacho feedback, use terminals G3 and G4 with the selector switch in the DC position
Calculate the tacho voltage by multiplying the required maximum speed by the tacho calibration
factor, e.g. motor speed 1500 rpm and tacho calibration factor 60V per 1000 rpm is 90V.
The tacho calibration volts are set using the 2 in-line switches (10-way). The switches set Volts in
units and tens. The hundreds are set by the 1-way switch. The illustration above shows a setting
of 90V.
This product may be fitted with a new version of the Analog Tacho Calibration Board:
ORIGINAL: The original option has part number AH385870U001 and the tacho calibration volts are set using the 2 in-line switches (10-way). The switches set
Volts in units and tens. The hundreds are set by the 1-way switch. The illustration shows a setting of 90V. When setting switches for AC tachos,
calibrate the switches for √2 x voltage feedback required, i.e. √2 x 90V = 127V. This adjusts the rms value received from an AC tacho into the required
peak value.
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
1
10
0
100
AC
DC
G1 G2 G3 G4
AC
DC
link wire
1 2 3 4 5 6 7 8 9 10
0 1 2 3 4 5 6 7 8 9
+
+
--
ORIGINAL – AH385870U001
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