6-28 Programming Your Application
590 Series DC Digital Converter
FLD. WEAK ENABLE
Range: ENABLED/DISABLED
Activates the additional motor back emf PID loop for field weakening (field spillover) control.
EMF LEAD
Range: 0.10 to 50.00
With field weakening control enabled, a PID loop is brought into operation. This is the lead time
constant adjustment of the field weakening PID loop.
With a default of 2.00, real time constant = 200ms.
EMF LAG
Range: 0.00 to 200.00
This is the lag time constant adjustment of the field weakening PID loop
With a default of 4.00, real time constant = 4000ms.
EMF GAIN
Range: 0.00 to 100.00
This is the gain adjustment of the field weakening PID loop.
With a default of 3.00, real gain = 30.
MIN FLD CURRENT
Range: 0.00 to 100.00 %
The field weakening loop reduces the field current to achieve speed control above base speed. At
top speed the field reaches a minimum value. The Min Fld Current should be set below this
minimum value to allow reasonable margin for transient control near the top speed but not lower
than 6% as this could then cause the "Field Fail" alarm to operate.
MAX VOLTS
Range: 0.00 to 100.00 %
Maximum volts is the voltage level at which field weakening begins. It is also known as
"Spillover Bias". The default value is 100% of the nominal value as set by the armature voltage
calibration value. For commissioning purposes this value can be set to another (lower) desirable
level. Subsequently, it is advisable to return it to 100% for normalisation.
BEMF FBK LEAD
Range: 10 to 5000 (ms)
This is the lead time constant of the back emf feedback filter which is used for reducing
armature voltage overshoots when accelerating fast through base speed.
BEMF FBK LAG
Range: 10 to 5000 (ms)
This is the lag time constant of the above feedback filter. If the filter is active, the ratio of lead /
lag should always be greater than 1 to give an overall lead action which reduces the voltage
overshoot and less than, typically, 3 for stable control. The default values 100/100 = 1 cancel
each other and make the filter inactive.
FLD QUENCH DELAY
Range: 0.00 to 600.00 SECS
If dynamic breaking is used the field must be maintained for a period after the drive is disabled.
The field quench delay is the period of time which the field is maintained for.
FLD. QUENCH MODE
Range: QUENCH/STANDBY
After the field quench delay has expired, the field can be entirely quenched or put into a standby
mode at 50% of rated current or volts depending whether in current or voltage control mode
respectively. (The default standby value of 50% can be modified through the "SYSTEM /
Reserved" Menu which is primarily for factory use only and requires the “super” password.)
FIELD ENABLE
Refer to the DIAGNOSTICS function block description, page 6-
18.
FIELD DEMAND
Refer to the DIAGNOSTICS function block description, page 6-
18.
FLD. FIRING ANGLE
Refer to the DIAGNOSTICS function block description, page 6-
18.
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