YASKAWA U1000 Series - Page 185

5.2 b: Application
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual 185
Parameter Details
5
soon as the frequency falls to the value set to E1-09.
The drive will not perform short-circuit braking when b2-01 = E1-09 = 0 Hz.
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.
Once the output frequency falls below the setting of b2-01, Zero Speed Control is enabled for the time set in parameter
b2-04.
Figure 5.5
Figure 5.5 Zero Speed Control at Stop in CLV and CLV/PM
Note: If b2-01 is set to lower than the minimum output frequency (E1-09), then Zero Speed Control begins at the frequency set to
E1-09.
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.
Figure 5.6
Figure 5.6 Coast to Stop
Note: After a stop is initiated, any subsequent Run command entered will be ignored until the momentary power loss minimum
baseblock time (L2-03) has expired. Do not enter Run command until it has come to a complete stop. To start the motor back up
before it has stopped completely, use DC Injection at start (refer to b2-03: DC Injection Braking Time at Start on page 191) or
Speed Search (refer to b3: Speed Search on page 192).
Setting 2: DC Injection Braking to stop
When the Run command is removed, the drive will enter baseblock (turn off its output) for the momentary power loss
minimum baseblock time (L2-03). Once the minimum baseblock time has expired, the drive will brake the motor by
injecting DC current into the motor windings. The stopping time is significantly faster than when compared with simply
coasting to stop. The level of current used for DC Injection Braking is set by parameter b2-02 (default = 50%).
Note: This function is not available in Closed Loop Vector Control (A1-02 = 3) and the control modes for PM motors (A1-02 = 5, 6, 7).
Figure 5.7
Figure 5.7 DC Injection Braking to Stop
Run command
Deceleration in the time set
Output frequency
ON OFF
E1-09 Min. Output Frequency
b2-01 DC Injection Braking
Start Frequency
Zero speed control
b2-04
Drive output is shut off
Run
command
Output
frequency
Motor speed
ON OFF
Motor coasts
DC Injection Braking
with the current set in
b2-02
Run
command
Output
frequency
ON OFF
Motor speed
Momentary Power
Loss Minimum
Baseblock Time
(L2-03)
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