BENSHAW RSi GM2 Series - Slip Compensation Operation

Learning Advanced Features
890054-00-00
GM2 Series VFD
107
Slip Compensation Operation
Slip refers to the variation between the set frequency (speed) and actual motor rotation speed.
During operation a set frequency, the slip will vary as the load changes. As the load increases, slip
will increase. Slip compensation is used for loads that require compensation of these speed
variations.
Group
Code
Name
Setting
Setting Range
Unit
dr
09
Control mode
2
Slip Compen
-
-
14
Motor capacity
2
0.75 kW (0.75 kW
based)
0–15
-
bA
11
Number of poles
4
2–48
-
12
Rated slip speed
90 (0.75 kW based)
0–3000
Rpm
13
Rated motor
current
3.6 (0.75 kW based)
1.0–1000.0
A
14
Motor noload
current
1.6 (0.75 kW based)
0.5–1000.0
A
16
Motor efficiency
72 (0.75 kW based)
64–100
%
17
Load inertia rate
0 (0.75 kW based)
0–8
-
Slip Compensation Operation Setting Details
Code and
Features
Description
dr.09 Control Mode
Set dr.09 to 2 (Slip Compen) to operate in slip compensation mode.
dr.14 Motor Capacity
Set the capacity of the motor connected to the inverter.
bA.11 Pole Number
Enter the number of poles from the motor name plate.
bA.12 Rated Slip
Enter the slip RPM’s from the motor name plate. This may be shown
in Hz. If so, convert to RPM’s. Slip frequency may also be calculated.


=Rated slip frequency


=Rated frequency
=Number of the rated motor rotations
=Number of motor poles
bA.13 Rated Curr
Enter the rated current from the motor name plate.
bA.14 Noload Curr
Enter the measured no-load current at the rated frequency. If no-load
current is difficult to measure, enter a current equivalent to 30–50%
of the rated motor current.
bA.16 Efficiency
Enter the efficiency from the motor rating place.
bA.17 Inertia Rate
Select load inertia based on motor inertia.
Configuration
Function
0
Less than 10 times motor inertia
1
10 times motor inertia
2–8
More than 10 times motor inertia