YASKAWA V1000 Series Technical Manual page 120

5.2 b: Setup
Speed Search for Momentary Power Loss Ride-Thru: Minimum Baseblock Time (b3-01 = 2)
The following timecharts illustrate how Speed Search operates during Momentary Power Loss Ride-Thru.
• If momentary power loss is shorter than the minimum baseblock time
After power is restored, the drive waits to perform Speed Search until the time set to b3-05 has passed.
Note: Power loss is shorter than L2-03: Current Detection Speed Search after Baseblock.
• If momentary power loss is longer than the minimum baseblock time:
Speed Search is performed automatically whenever the
Settings for b3-01
run command is entered.
0 Not possible
1 Possible
Note: Default setting is 0.
L2-01 needs to be set to 1 or 2 to enable Speed Search following momentary power loss. To enable Speed Search when performing a fault restart, set
L5-01 to any value besides 0.
b3-02: Speed Search Deactivation Current
n
Sets speed search operating current in units of percent with the drive rated current as 100%. Normally there is no need to change this setting. If the drive
won't run after a restart, lower this value.
No.
b3-02
Detailed Description
When using the current detection method of Speed Search (b3-01 = 2 or 3), 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.
Note: When parameter A1-02 = 0 (V/f control without PG) the factory default setting is 120. When parameter A1-02 = 2 (Open Loop Vector) the factory default setting is 100.
b3-03: Speed Search Deceleration Time
n
Parameter b3-03 sets the deceleration ramp used by the current detection method of Speed Search (b3-01 = 2 or 3) 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).
120
output frequency before
momentary power loss
AC power
supply
ON OFF
output
frequency
output
current
min baseblock time (L2-03)
output frequency before
momentary power loss
AC power
supply
ON
output
frequency
output
current
min baseblock time (L2-03)
Figure 5.13 Power Loss is Longer than L2-03: Current Detection Speed after Baseblock
Speed Search Settings and Methods
Parameter Name
Speed Search Deactivation Current
decel time
set to b3-03
Speed Search operation
current set to b3-02
*
decel time
set to b3-03
OFF
Speed Search operation
current set to b3-02
Speed Search wait
time set to b3-05
Speed Search is performed after a fault restart, external baseblock release command, external Speed
Search command, and after momentary power loss.
Possible
Possible
Setting Range
0 to 200
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
waits for twice
as long as L2-04
selected
frequency
reference
waits for twice
as long as L2-04
selected
frequency
reference
Default
Determined by A1-02