Entering Eco Mode
When the deviation between the output frequency and the power supply frequency becomes equal to or less than the setting
values of b1-26, an output frequency coincidence condition exists. The drive will operate in commercial power switching
mode. If the drive will not switch to commercial power supply switching mode, set b1-26.
Exiting Eco Mode
When the deviation between the output frequency and the power supply frequency becomes equal to or greater than the setting
value of b1-25 + b1-26, the drive will operate in PWM switching mode. If commercial power switching mode and PWM
switching mode are repeated frequently, increase the setting value of b1-25.
Note:
The drive will not switch to commercial power switching mode when L3-06, Stall Prevention Level during Run, is exceeded and L3-05,
Stall Prevention Selection during Run, is enabled.
No.
Parameter Name
Setting Range
Default
b1-25
Commercial Power Supply Operation Cancellation Level
0.4 to 6.0 Hz
1.0 Hz
b1-26
Commercial Power Supply Operation Switching Level
0.0 to 3.0 Hz
0.2 Hz
u
b2: DC Injection Braking
b2 parameters determine operation of the DC Injection Braking and Zero Speed Control features.
n
b2-01: DC Injection Braking Start Frequency
Active when “Ramp to Stop” is selected as the stopping method (b1-03 = 0).
No.
Name
Setting Range
Default
b2-01
DC Injection Braking Start Frequency
0.0 to 10.0 Hz
Determined by
A1-02
The function triggered by parameter b2-01 depends on the control mode that has been selected.
OLV/PM, AOLV/PM, V/f, V/f w/PG and OLV (A1-02 = 0, 1, 2, 5, 6)
For these control modes, parameter b2-01 sets the starting frequency for DC Injection Braking at Stop. When the output
frequency falls below the setting of b2-01, DC Injection Braking is enabled for the time set in parameter b2-04.
Output
Frequency
Time
b2-04
DC Injection
Braking
E1-09 Min. Output Freq.
b2-01 DC Inj. Braking Start Freq.
Figure 5.15 DC Injection Braking at Stop for V/f, V/f w/PG, and OLV
Note:
If b2-01 is set to a smaller value than E1-09 (Minimum Output Frequency), then DC Injection Braking will begin when the frequency falls
to the E1-09 value.
CLV and CLV/PM (A1-02 = 3, 7)
For these control modes, parameter b2-01 sets the starting frequency for Zero Speed Control (not position lock) at Stop. When
the output frequency falls below the setting of b2-01, Zero Speed Control is enabled for the time set in parameter b2-04.
Time
Zero Speed
Control
b2-04
Output
Frequency
E1-09 Min. Output Freq.
b2-01 DC Inj. Braking Start Freq.
Figure 5.16 Zero Speed Control at Stop in CLV and CLV/PM
Note:
If b2-01 is set to a smaller value than E1-09 (Minimum Output Frequency), then Zero Speed Control begins at the frequency set to E1-09.
n
b2-02: DC Injection Braking Current
Sets the DC Injection Braking current as a percentage of the drive rated current. The carrier frequency is automatically reduced
to 4 kHz when this parameter is set to more than 50%.
5.2 b: Application
196
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
Summary of Contents for U1000 iQpump Drive
Page 705: ......
