Programming 5 - 13 – Yaskawa P7B Drive Bypass User Manual
Page 107
Programming 5 - 13
When the output frequency has dropped below the DC Injection Start Frequency in b2-01 (Default = 0.5HZ) DC current will
be injected in the motor at a level determined by b2-02 (50% Default). The DC Injection condition will occur for the time
specified by b2-04 (0.0 Default), to establish the end point of the ramp. DC injection can be used to insure the motor is at zero
rpm prior to the Drive shutting off.
Fig 5.2 Deceleration to Stop
The actual deceleration time can be determined by the following formula
If S-Curve characteristics are specified by the Drive programming, they will add to the total time to stop.
1:Coast to stop: When the Run command is removed, the Drive will turn off its output and the motor will coast (uncon-
trolled deceleration). The friction of the driven equipment will eventually overcome any residual inertia of
the system and the rotation will stop.
Fig 5.3 Coast to Stop
IMPORTANT
After a stop is initiated, a subsequent Run commands input before the Minimum Baseblock Time (L2-03)
has expired, will be ignored.
ON
OFF
Run Command
Output Frequency
Deceleration Time (C1-02)
DC Injection Brake
100 %
0 %
TIME
| b2-04 |
b2-01
(CLOSED)
(OPEN)
02)
-
(C1
Time
Decel
active
of
Setting
04)
-
(E1
Frequency
Maximum
command
stop
of
at time
Freq.
Output
Stop
to
Time
×
=
02 or C1-04)
ON
OFF
Run Command
Output Frequency
Drive Output Frequency Interrupted
100 %
0 %
TIME
Motor Speed
(CLOSED)
(OPEN)