YASKAWA Z1000U Series, Programming Manual

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n b1-03: Stopping Method Selection
Selects how the drive stops the motor when the Run command is removed or when a Stop command is entered.
No. Parameter Name Setting Range Default
b1-03 Stopping Method Selection 0 to 3 1
Setting 0: Ramp to Stop
When the Run command is removed, the drive will decelerate the motor to stop. The deceleration rate is determined by the
active deceleration time. The default deceleration time is set to parameter C1-02.
When the output frequency falls below the level set in parameter b2-01, the drive will start DC injection or Zero Speed Control
depending on the selected control mode.
Setting 1: Coast to Stop
When the Run command is removed, the drive will shut off its output and the motor will coast (uncontrolled deceleration) to
stop. The stopping time is determined by the inertia and the friction in the driven system.
Drive output is shut off
Run
command
Output
frequency
Motor speed
ON OFF
Figure 1.3 Coast to Stop
Note: After a stop is initiated, any subsequent Run command entered will be ignored until the minimum baseblock time (L2-03) has expired. Do
not enter Run command until it has come to a complete stop. Use DC Injection at Start ( Refer to b2-03: DC Injection Braking Time at
Start on page 22 ) or Speed Search ( Refer to b3: Speed Search on page 23 ) to restart the motor before it has completely stopped.
Setting 2: DC Injection Braking to Stop
When the Run command is removed, the drive will enter baseblock (turn off its output) for the minimum baseblock time
(L2-03). When the minimum baseblock time has expired, the drive will inject the amount DC current set in parameter b2-02
into the motor windings to brake the motor. The stopping time in DC Injection Braking to Stop is significantly faster compared
to Coast to Stop.
Note: This function is not available in OLV/PM control mode (A1-02 = 5).
Motor coasts
DC Injection Braking
with the current set in
b2-02
Run
command
Output
frequency
ON OFF
Motor speed
Minimum Baseblock
Time (L2-03)
Figure 1.4 DC Injection Braking to Stop
DC Injection Braking time is determined by the value set to b2-04 and the output frequency at the time the Run command is
removed. It can be calculated by:
1.2 b: Application
18 YASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual