Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 135)

Setting 0: Reverse Enabled
Possible to operate the motor in both forward and reverse directions.
Setting 1: Reverse Disabled
Drive disregards a Reverse run command or a negative frequency reference.
n b1-24: Commercial Power Operation Switching Selection
When the output frequency matches the power supply frequency (60 Hz), the PWM switching operation stops and switches
to operation with a direct commercial power supply connection.
Note: 1. Switching can be enabled when an inductive motor is being driven.
2. Current value may change when a switch is made.
3. Verify that the induction motor can be driven with the commercial power supply (e.g., the rated voltage and rated speed) prior to enabling
the commercial power switching selection.
No. Parameter Name Setting Range Default
b1-24 Commercial Power Switching Selection 0, 1 0
Setting 0: Disabled
A voltage will be output with PWM switching operation regardless of the output frequency.
Setting 1: Enabled
When the deviation between the output frequency and the power supply frequency is less than or equal to the commercial
power switching output frequency coincidence level (b1-26), the PWM switching operation stops and switches to operation
with a direct commercial power supply connection.
Operation with a direct commercial power supply continues until the deviation between the output frequency and the power
supply frequency is greater than or equal to the commercial power switching output frequency coincidence/non-coincidence
level (b1-25 + b1-26).
n b1-25/b1-26: Commercial Power Switching Output Frequency Coincidence Level/Non-
coincidence Level
These parameters set the value in 0.1 Hz increments at which commercial power supply switching selection is enabled and
disabled.
When the deviation between the output frequency and the power supply frequency becomes equal to or less than the setting
values of b1-25 + 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.
When the deviation between the output frequency and the power supply frequency becomes equal to or greater than the setting
value of b1-25, 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 Switching 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 and Short Circuit Braking
These parameters determine operation of the DC Injection Braking, Zero Speed Control, and Short Circuit Braking 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 0.5 Hz
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.
5.2 b: Application
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 135
5
Programming