Yaskawa Z1000U - Manual (Page 118)

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 4.15 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:
DC Injection brake time
(b2-04) x 10 x Output frequency
Max. output frequency (E1-04)
=
Output frequency when
Stop command was entered
100%
(Maximum output
frequency)
10%
DC Injection braking time
b2-04×10
b2-04
Figure 4.16 DC Injection Braking Time Depending on Output Frequency
Note: If an overcurrent (oC) fault occurs during DC Injection Braking to Stop, increase the momentary power loss minimum baseblock time
(L2-03) until the fault no longer occurs.
Setting 3: Coast with Timer
When the Run command is removed, the drive will turn off its output and the motor will coast to stop. The drive will not start
if a Run command is input before the time t (C1-02) has expired. Cycle the Run command that was activated during time t
after t has expired to start the drive.
Drive output shut off
Run wait time t
Run command
Output
frequency
ON ON ON OFF OFF
Figure 4.17 Coast with Timer
4.7 Basic Drive Setup Adjustments
118 YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual