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Programming 6-27MN792
Field Control Continued
Parameter Descriptions
MAX VOLTS
The voltage level at which field weakening begins. It is also known as “Spillover Bias”. The factory
setting value is 100% of the nominal value as set by the armature voltage calibration value. For
start–up this value can be set to a lower desirable level. It is advisable to return it to 100% for
normal operation.
Range: 0.00 to 100.00 %
BEMF FBK LEAD
The lead time constant of the back EMF feedback filter used for reducing armature voltage
overshoots when during fast acceleration through base speed.
Range: 10 to 5000
BEMF FBK LAG
The lag time constant of the back EMF feedback filter. If active, the ratio of lead / lag should always
be greater than 1 to give an overall lead action (reduces overshoot) and the ratio should be less
than 3 for stable control. The factory values 100/100 = 1 make the filter inactive.
Range: 10 to 5000
FLD. QUENCH DELAY
If dynamic braking is used, the field must be maintained for a period after the drive is disabled. The
field quench delay is the period of time that the field is maintained.
Range: 0.0 to 600.0
Seconds
FLD. QUENCH MODE
When 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 factory value of 50% can be modified through the “SYSTEM / Reserved” Menu
which is primarily for factory use only and requires the “super” password.)
Range: 0 : Quench
1 : Standby
Functional Description
Field Control
Phase Angle
Control
[169]
Field
Enabled
[170] Field Enable Enabled
Tag# Parameter Factory Setting
[209] FLD CTRL Mode Voltage
Supply Alarms OK
[186] Field Quench Mode Quench
Tag# Parameter Factory Setting
[185] Field Quench Delay 0.00 Sec
Quench
Standby
X / 2
Field Voltage VARS
+
Field Regulator RMS Volts
[210] Ratio Out/In 90.00%
+
Field Weak VARS
[174] FLD Weak Enable Disabled
[175] EMF Lead 2.00
[191] BEMF FBK Lead 100
[192] BEMF FBK Lag 100
[176] EMF Lag 40.00
[177] EMF Gain 0.30
PI
+
Clamp
-
Motor
BEMF Filter
[178] MAX Volts 100.00%
[179] MIN FLD Current 100.00%
Field Current VARS
[60]
Supply Field OutputRatio
460V
460V
230V
230V
90%
67%
90%
67%
410V
300V
200V
150V
Output In Voltage Mode
Drive
Enable
PI
-
+
-
[173] PROP Gain 0.10
[172] INT Gain 1.28
[171] Setpoint 100.00%
Field Demand
Field
Firing
Angle
+
[181]
[184]
[183]