Yaskawa P7B Drive Bypass - Manual (Page 110)

Programming 5 - 16
" b1-11 Drive Delay Time Setting
Setting Range: 0 to 600 Seconds
Factory Default: 0 Seconds
If a time is set into parameter b1-11, the Drive will delay executing any run command until the b1-11 time has expired.
During Drive delay time execution, the digital operator will display:
Both the ALARM and Run indicators will blink while the Drive waits to execute the Run command.
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b2 DC Braking
The DC Braking Group contains parameters associated with the DC injection braking feature. Parameters involving the starting
frequency, current level, braking time, and motor pre heat current level are located here.
" b2-01 DC Injection Braking Start Frequency
Setting Range: 0.0 to 10.0 Hz
Factory Default: 0.5 Hz
Parameter b2-01 sets the output frequency where the Drive begins DC Injection during Ramp to stop. in order to lock the rotor of
the motor and established the end point of the ramp. If b2-01 < E1-09 (Minimum Frequency), then DC Injection begins at E1-09.
Parameter b2-01 also determines the output frequency that the Drive must be at or below before a Zero Speed condition is con-
sidered true. This affects any digital output configured as a Zero Speed signal (H2-0x= “1: Zero Speed”).
Fig 5.6 DC Injection Braking During Stopping
" b2-02 DC Injection Braking Current
Setting Range: 0 to 100%
Factory Default: 50%
The level of DC Injection Braking Current affects the strength of the magnetic field attempting to lock the motor shaft.
Increasing the level of current will increase the amount of heat generated by the motor windings and should only be increased to
the level necessary to hold the motor shaft. DC Injection current is set in percentage of Drive rated output current. Drive rated out-
put current is stated on the Drive nameplate.
DDLY
Waiting to RUN
Output Frequency
t
b2-01
DC injection
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b2-04
ime