Eurotherm 590+ Series, Product Manual, Page: 142 / 308

6-32
Programming Your Application
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 parameter for the
open loop voltage control mode.
FLD CURRENT VARS
Contains the parameters for the
closed loop current 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 ENABLED [169]
–
DISABLED
–
FIELD DEMAND [183]
–
0.00 %
– FLD. FIRING ANGLE [184] – 0.00 DEG
ENABLED
–
[170] FIELD ENABLE
–
VOLTAGE CONTROL
–
[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 SECS
–
[185] FLD. QUENCH
DELAY
–
QUENCH
–
[186] FLD. QUENCH MODE
–
MMI Menu Map
1
SETUP PARAMETERS
2
FIELD CONTROL
FIELD ENABLE
FLD CTRL MODE
FLD QUENCH DELAY
FLD. QUENCH MODE
MMI Menu Map
1
SETUP PARAMETERS
2
FIELD CONTROL
3
FLD VOLTAGE VARS
FLD. VOLTS RATIO
MMI Menu Map
1
SETUP PARAMETERS
2
FIELD CONTROL
3
FLD CURRENT VARS
4
FLD WEAK VARS
FLD. WEAK ENABLE
EMF LEAD
EMF LAG
EMF GAIN
MIN FLD. CURRENT
MAX VOLTS
BEMF FBK LEAD
BEMF FBK LAG
MMI Menu Map
1
SETUP PARAMETERS
2
FIELD CONTROL
3
FLD CURRENT VARS
SETPOINT
PROP. GAIN
INT. GAIN
MMI Menu Map
1
CONFIGURE DRIVE
FLD CTRL MODE
FLD. VOLTS RATIO
Parameter Descriptions
FIELD ENABLED Range: See below
Refer to the DIAGNOSTICS function block description, page 6-22.
0 : DISABLED
1 : ENABLED
FIELD DEMAND Range: xxx.xx %
Refer to the DIAGNOSTICS function block description, page 6-22.
FLD. FIRING ANGLE Range: xxx.xx DEG
(FLD.FIRING ANGLE)
Refer to the DIAGNOSTICS function block description, page 6-22.
FIELD ENABLE Range: See below
Unquenches field current loop.
0 : DISABLED
1 : ENABLED
FLD CTRL MODE IS Range: See below
(FLD.CTRL MODE)
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.
0 : VOLTAGE CONTROL
1 : CURRENT CONTROL
RATIO OUT/IN Range: 0.00 to 100.00 % (h)
(FLD.VOLTS RATIO)
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.