Operating the Converter 4-3
590 Series DC Digital Converter
Armature Voltage (VA CAL)
Set this using the 4-way switch, SW7. The switch sets voltage according to the table below.
VA Armature Volts VA (Volts)
Switch 150 175 200
1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
2 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0
3 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
4 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
A “1” indicates that the switch is ON.
The illustration on the previous page shows a VA CAL setting of 200V.
Note: Calibration up to 700V is possible with external stacks. Refer to Parker SSD Drives.
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.
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
Microtach/Encoder Feedback Option Board
The option board assumes a 1000 lines per rev encoder is being used. Speed is set directly by
the ENCODER RPM parameter. If you are using an alternative lines per rev encoder, you must
set the ENCODER LINES parameter on the MMI later in the Operating Instructions.
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
+
+
--
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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