Operating the Converter
4-5
590+ Series DC Digital Converter
FLD.CTRL MODE
Set the field control mode to Field Voltage or Field Current control. Refer to Chapter 6:
“Programming Your Application” - Field Control for further information. By default, the drive
is operating in Voltage Control mode.
FLD.VOLTS RATIO
Enter the calculated ratio into the parameter given by the equation:
The default setting of 90% is the maximum value obtainable,
i.e. field output = 0.9 x Vac
Selecting Speed Feedback
AUXILIARY POWER ONLY IS CONNECTED AT THIS STAGE
Using the Operator Station, select the correct speed feedback option.
The default is ARM VOLTS FBK.
The selections are ARM VOLTS FBK, ANALOG TACH, ENCODER
and ENCODER/ANALOG.
Note:
Refer to Chapter 13: “Standard and Optional Equipment” - Speed Feedback Option
Boards for further information.
Speed Feedback Option Boards
Analog Tacho Calibration Option Board
WARNING!
Do not fit this Option Board with the drive powered-up.
Note:
This option is not required if armature
voltage or encoder feedback is to be used.
The board plugs into the front of the drive.
Mount it on the 10-pin connector correctly.
This will allow the locating pegs to align with
the mounting holes. 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 200V:
x
For AC tacho feedback, use terminals G1
and G2 with the selector switch in the AC
position.
x
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. 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.
Note:
Do not set the calibration volts to greater than 200V, the maximum terminal block rating.
FIELD VOLTS
RMS AC INPUT VOLTS
100 x
MMI Menu Map
1
CONFIGURE DRIVE
SPEED FBK SELECT
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
+
+
-
-
