YASKAWA iQpump Series Programming Manual page 16

Figure 1.10
Run Command
Output Frequency
Important: After a stop is initiated, a subsequent Run commands input before the Minimum Baseblock Time (L2-03) has expired, will
be ignored.
2: DCInj to Stop: When the Run command is removed, the iQpump drive will Baseblock (turn off its output) for the Minimum
Baseblock Time (L2-03). Once the Minimum Baseblock Time has expired, the iQpump drive will inject DC current into the motor
windings to lock the motor shaft. The stopping time will be reduced as compared to Coast to Stop. The level of DC Injection current is set
by parameter b2-02 (50% Default). The DC Injection brake time is determined by the set value in b2-04 and the output frequency at the
time the Run command is removed.
DC Injection Brake Time
Figure 1.11
Run Command
100 %
Output Frequency
0 %
Important: If an overcurrent (OC) fault occurs during DCInj to Stop, lengthen the Minimum Baseblock Time (L2-03) until the fault no
longer occurs.
3: Coast w/Timer: When the Run command is removed, the iQpump drive will turn off its output and the motor will coast to a stop. If a
Run command is input before time T (operation wait time) expires, the iQpump drive will not run and the Run command will need to be
cycled before operation can occur. The time T (operation wait time) is determined by the output frequency when the Run command is
removed and the active deceleration time (C1-02).
16
100 %
0 %
Figure 10 Coast to Stop
× ×
(b2 - 04) 10 Output Frequency
=
Maximum Frequency (E1
Drive Output Voltage Interrupted
Minimum Baseblock
Time (L2-03)
Figure 11 DC Injection Braking to Stop
Motor Speed
Drive Output Frequency Interrupted
TIME
- 04)
ON
(CLOSED)
OFF
(OPEN)
DC Injection Brake
DC Injection Brake Time
b2-04
(CLOSED)
ON
(OPEN)
OFF
b2-04 x 10
b2-04
10%
YASKAWA TM.iQp.02 iQpump Drive Programming Manual
100% (Maximum
Output Frequency)