Programming Your Application 6-27
590 Series DC Digital Converter
FIELD CONTROL
This function block contains
all the parameters for the field
operating mode. It is viewed
in three separate menus on the
MMI.
In the FIELD CONTROL
menu, you select the field operating mode: open loop
voltage control or closed loop
current control.
FLD VOLTAGE VARS
Contains the parameters for
the open loop voltage control
mode.
FLD WEAK VARS
Contains the parameters for
the closed loop current control
mode.
In certain applications of a DC
motor controller, high speeds
can only be achieved by reducing the field current and therefore the resultant torque. This is
termed as the Constant-Horsepower region or Field-Weakening region, and the speed at which
it begins is known as the Base Speed.
FIELD CONTROL
–
FIELD ENABLE [169]
–
DISABLED
–
FIELD DEMAND [183]
–
VOLTAGE
–
FLD. FIRING ANGLE [184]
–
0 DEG
ENABLED
–
[170] FIELD ENABLE
–
VOLTAGE
–
[209] FLD CTRL MODE IS
–
90.00%
–
[210] RATIO OUT/IN
–
100.00%
–
[171] SETPOINT
–
0.10
–
[173] PROP. GAIN
–
1.28
–
[172] INT. GAIN
–
DISABLED
–
[174] FLD. WEAK ENABLE
–
2.00
–
[175] EMF LEAD
–
40.00
–
[176] EMF LAG
–
0.30
–
[177] EMF GAIN
–
10.00%
–
[179] MIN FIELD CURRENT
–
100.00%
–
[178] MAX VOLTS
–
100
–
[191] BEMF FBK LEAD
–
100
–
[192] BEMF FBK LAG
–
0.0 SEC
–
[185] FLD. QUENCH DELAY
–
QUENCH
–
[186] FLD. QUENCH MODE
–
MMI Menu Map
1
SETUP PARAMETERS
2
FIELD CONTROL
FIELD ENABLE
FLD CTRL MODE IS
MMI Menu Map
1
SETUP PARAMETERS
2
FIELD CONTROL
3
FLD VOLTAGE VARS
RATIO OUT/IN
SETPOINT
PROP. GAIN
INT. GAIN
MMI Menu Map
1
SETUP PARAMETERS
2
FIELD CONTROL
3
FLD WEAK VARS
FLD. WEAK ENABLE
EMF LEAD
EMF LAG
EMF GAIN
MIN FLD CURRENT
MAX VOLTS
BEMF FBK LEAD
BEMF FBK LAG
FLD QUENCH DELAY
FLD. QUENCH MODE
Parameter Descriptions
FIELD ENABLE
Range: ENABLED/DISABLED
Unquenches field current loop.
FLD CTRL MODE IS
Range: VOLTAGE
CONTROL/
CURRENT CONTROL
There are two field control modes:
(a) Field Voltage Control is an open loop phase angle control to give a certain
voltage output.
(b) Field Current Control is a closed loop current control for accurate field
control or expansion to field weakening.
RATIO OUT/IN
Range: 0.00 to 100.00 %
This parameter controls the output voltage from the open loop voltage control. The ratio is
defined as the DC output voltage over the AC RMS input voltage.
The default setting is equivalent to a single-phase diode rectifier.
SETPOINT
Range: 0.00 to 100.00 %
Field current setpoint.
PROP. GAIN
Range: 0.00 to 100.00
This is the proportional gain adjustment of the field current PI loop. The default of 0.10 is
equivalent to a real gain of 10.
INT. GAIN
Range: 0.00 to 100.00
This is the integral gain adjustment of the field current PI loop.
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