Yaskawa VS-626 MC5 - Manual (Page 197)

7.3 Common Functions
- 59
Carrier Frequency Reduction Selection: L8--17 (fot SPEC: F)
User
Change
during Setting Factory
Valid Access Levels User
Constant
Number
Name
during
Opera-
tion
Setting
Range Unit
Factory
Setting Open Loop
Vector
Flux Vector
L8-17
Carrier frequency reduc-
tion selection 2
0 to 3 -- 1 A
D Settings
Setting Function
0 No carrier frequency reduction.
1 With carrier frequency reduction.
2 For factory adjustments.
3 For factory adjustments.
D If metallic noise (carrier noise) from the motor is a problem when carrier frequency is reduced (less
than 6 Hz), set L8--17 to 0 (no carrier frequency reduction), and L8--19 (OL2 characteristics selection
at low speeds) to 1 (enabled).
D Do not L8--17 and L8--19 to 0 at the same time when using V/f control open loop vector control.
OL2 characteristics Selection at Low Speeds: L8--19 (for SPEC: F)
User
Change
during Setting Factory
Valid Access Levels User
Constant
Number
Name
during
Opera-
tion
Setting
Range Unit
Factory
Setting Open Loop
Vector
Flux Vector
L8-19
OL2 characteristics
selection at low speeds
0 1 -- 0 A A
D Settings
Setting Function
0 OL2 characteristics at low speeds disabled.
1 OL2 characteristics at low speeds enabled.
D When using OL2 to trip at low speeds (less than 6 Hz) despite a light load, set L8--17 to 1 (with carrier
frequency reduction) and L8--19 (OL2 characteristics selection at low speeds) to 0 (disabled).
However, do not set 18--19 to 0 for 400 V class, 185 to 300 kW Inverters.
D Do not L8--17 and L8--19 to 0 at the same time when using V/f control open loop vector control.
D Reduce the carrier frequency (C6--01) to 2 kHz when continuously operating at low speeds with heavy
loads when using flux vector control.
7