C
Co
on
ns
stta
an
ntt F
Frre
eq
qu
ue
en
nc
cy
y D
De
ette
ec
cttiio
on
n L
Le
ev
ve
ell
Range: 0.0 - 400 (Hz)
n
n 5
5 3
3
Factory Setting: 0.0
Establishes the frequency level used as a reference when programming a multi-
function output terminal or contact to change state at Frequency Detection (see
page 32).
C
Co
on
ns
stta
an
ntt S
Slliip
p C
Co
om
mp
pe
en
ns
sa
attiio
on
n G
Ga
aiin
n
Range: 0.0 - 9.9 (%)
n
n 5
5 4
4
Factory Setting: 0.0
As load increases, the motor slip value increases and motor speed decreases. The
slip compensation function maintains motor speed even if load varies. When drive
output current is equal to motor rated current (n
n 3
3 1
1 ), the slip compensation
frequency is added to the output frequency.
This constant sets the slip compensation gain, in increments of 0.1%. When the gain
is “ 1.0 ”, the output frequency is increased by 1% of the n
n 2
2 6
6 (Maximum voltage
frequency) setting at rated current. A setting of “ 0.0 ” results in no slip
compensation.
The slip compensation value is calculated as follows:
nn5
54
4 =
Motor synchronous RPM — Motor nameplate RPM
x 100%
Motor synchronous RPM
Example:
Desired frequency is 45 Hz
Motor slip = 3% at full load
(n
n 5
5 4
4 = 3
3 .. 0
0 )
Actual output frequency at
full load = 46.35 Hz
NOTES:
1) Slip compensation is disabled
during the following conditions:
• When motor rated current
(n
n 3
3 1
1 ) is set to “ 0.0 ” Amps;
• When Fout < Fmin (n
n 2
2 9
9 );
• During regeneration.
2) In the constant horsepower
region [ Fout ≥ Fmax. (n
n 2
2 6
6 ),
the slip compensation
frequency is increased
automatically as shown
at right.
51
V
f
46.35 Hz actual output
3% frequency
boost
corresponding
voltage boost
45 Hz command
SLIP COMPENSATION
FREQUENCY
OUTPUT
FREQUENCY
n26
n24
n24 x n54
n26 x n54
OUTPUT FREQUENCY x
n54
for more: efesotomasyon - Yaskawa drive