Yaskawa VS-626 MC5 - Manual (Page 238)

User Constants
8.2.7 Protection Constants: L
- 30
Constant
Number Page
Control Methods Change
during
Opera-
tion
Factory
Setting
Setting
Range Description
Name
Constant
Number Page
Flux Vector Open Loop
Vector
Change
during
Opera-
tion
Factory
Setting
Setting
Range Description
Display
L8-17
Carrier frequency re-
duction selection
0: No carrier frequency reduction
1: With carrier frequency reduc-
tion
2: For factory adjustments
3. For factory adjustments
If the metallic noise (carrier
i ) t d f th t
0 to 3 1 A - 59 L8 17
L--Spd IGBT Prtct
(
noise) generated from the motor
at low speeds (less than 6 Hz)
becomes a problem, set L8--17 to
0 and L8--19 to 1.
However, do not set L8--17 or
L8--19 to 0 when using open--
loop vector control.
0 to 3 1 A - 59
L8-19
OL2 characteristics
seleciton at low
speeds
0: OL2 characteristics at low
speeds disabled.
1: OL2 characteristics at low
speeds enabled.
If using OL2 to trip at low speeds
(less than 6 Hz) even though the
load is light, set L8--17 to 1 and
L8--19 to 0
0 1 0 A A - 59
OL2 Chara @ L--Spd
L8--19 to 0.
However, do not set L8--17 or
L8--19 to 0 when using open--
loop vector control.
Do not set L8--19 to when using
a 400 V class (185 to 300 kW)
Inverter.
8