Slip Compensation - YASKAWA V7 Technical Manual

5.22 SLIP COMPENSATION

n111 : Slip Compensation Gain
Slip compensation is used to increase motor speed to account for slip; the drive accomplishes this by
automatically boosting output frequency, with a corresponding boost in output voltage.
The slip compensation gain (n111) determines how much compensation frequency is added. If using
the Drive in Open Loop Vector, typically no adjustment is necessary. The equation below illustrates
how the compensation frequency is generated.
NOTE: A slip compensation gain setting of 0.0 disables slip compensation.
Compensation Frequency =
n110 : Motor No-Load Current
Motor no-load current (n110 ) is set as a percentage of motor full-load current (n036 ). It is used as
shown in the slip compensation equation.
n112 : Slip Compensation Primary Delay
Time Constant
Parameter n112 can be increased to improve stability or decreased to improve response to load
changes.
n113 : Slip Compensation Selection
During Regen
Parameter n113 determines whether the slip compensation gain will be enabled or disabled during
regeneration.
Setting Description
0 Disabled - No slip compensation will be added when regenerating
1 Enabled - Slip compensation will be added when regenerating
Output Current –
Slip Compensation Equation
46.35 Hz actual output
45 Hz command
V
5-34
Factory setting: See Table A3-1
Range: 0.0 to 2.5
(n110 * n036)
100
n036 – (n110 * n036)
100
1.35 H
frequency boost
corresponding
voltage boost
f
Factory setting: See Table A3-1
Range: 0 to 99%
* n106 * n111
Factory setting: 2.0 sec.
Range: 0.0 to 25.5 sec.
Factory setting: 0
Range: 0 or 1.