B4 Delay Timers - YASKAWA E7U Programming Manual

b3-02 Speed Search Deactivation Current
Setting Range: 0 to 200% of Drive rated output current
Factory Default: 120% of Drive rated output current
When using the current detection method of Speed Search, parameter b3-02 sets the current level that will determine when the
search is complete and the rotor and output speeds match. When the output frequency is higher than the actual rotor speed the
slip causes the current to be high. As the output frequency is lowered, the closer it comes to the rotor speed, the lower the
current draw will be. When the output current drops below the level as set in b3-02 (100% = Drive Rated Current) the output
frequency stops decreasing and normal operation resumes.
b3-03 Speed Search Deceleration Time
Setting Range: 0.1 to 10.0 Seconds
Factory Default: 2.0 Seconds
Parameter b3-03 sets the deceleration ramp used by the current detection method of Speed Search when searching for the
motor's rotor speed. Even if Speed Search 2 is selected, for Speed Search at start, the time entered into b3-03 will be the time
to decelerate from maximum frequency (E1-04) to minimum frequency (E1-09).
b3-05 Speed Search Delay Time
Setting Range: 0.0 to 20.0 Seconds
Factory Default: 0.2 Seconds
In cases where an output contactor is used between the Drive and the motor, extra waiting time is provided after power returns
and before Speed Search is performed. This extra time allows for the contactor to operate. When Speed Search at start is used,
b3-05 will serve as the lower limit of the Minimum Baseblock Time (L2-03).
b3-14 Bi-Directional Speed Search Selection
Setting
0 Disabled
1 Enabled (factory default)
The b3-14 parameter can be used to turn off the bi-directional capabilities of the Speed Estimation form of Speed Search. By
turning off the bi-directional capability, the speed search will only try to match the speed in the last known direction.

b4 Delay Timers

The Drive has an internal timer function that operates independently from the Drive. A digital input must be programmed to be
a timer start input by setting H1-0x= 18. A digital output must be programmed as a timer output by setting H2-0x= 12.
(Not to be confused with the "Wait to Run Time" in b1-11)
b4-01 Timer Function ON-Delay Time
Setting Range: 0.0 to 3000.0 Seconds
Factory Default: 0.0 Seconds
The timer start input (H1-0x= 18) must be held on for at least the time specified in parameter b4-01 before the digital output
programmed as the timer output will close. See Figure on following page for timing details.
Description
Programming 15