YASKAWA Varispeed G7 Series Instruction Manual page 304

Current Detection Speed Search (b3-01 = 2 or 3)
The time charts for current detection speed search is shown below.
Speed Search at Startup (b3-01 = 3)
The time chart when speed search at startup or external speed search command is selected is shown below.
OFF
Run Command
Maximum output
frequency or
set frequency
Output frequency
Output current
Minimum baseblock time
(L2-03)
Fig 6.48 Speed Search at Startup (Using Current Detection)
Speed Search after Short Baseblock (b3-01 = 2)
The time chart when the Inverter operation is restarted after power has been restored is shown below.
Loss Time Shorter Than Minimum Baseblock Time
•
AC power supply
ON
Output frequency
Output current
Minimum baseblock time (L2-03)
Fig 6.49 Speed Search After Baseblock (Current Detection: Loss Time < L2-03)
Loss Time Longer Than Minimum Baseblock Time
•
AC power supply
Output frequency
Output current
Fig 6.50 Speed Search After Baseblock (Current Detection: Loss Time > L2-03)
ON
Deceleration time set in b3-03
*
* Lower limit is set using Speed Search Time (b3-05).
OFF
Output frequency before power loss
*1 Baseblock time may be reduced by the output frequency
immediately before baseblock.
*1 *2 After AC power supply recovery, motor waits for the minimum
Speed Search Wait Time (b2-03).
*2
ON OFF Output frequency before power loss
Minimum baseblock time
(L2-03)
Set frequency
reference
b3-02
Set frequency
Deceleration
reference
time set in b3-03
b3-02
speed search operating current
Deceleration speed set in b3-03
b3-02
Speed search operating time
Speed search wait time (b3-05)
Continuing Operation
Set frequency
reference
6-
71