Note: When DC Injection Braking cannot be used at start, the motor will likely fault out if Speed Search is not enabled and the motor is allowed to continue rotating.

b2-04: DC Injection Braking Time at Stop

This parameter works in combination with b2-01, and sets the DC Injection Braking time at stop in units of 0.01 s. Used to bring the motor to a stop when

inertia is causing it to rotate.

No.

b2-04

b2-08: Magnetic Flux Compensation Capacity

Sets the magnetic flux compensation as a percentage of the no-load current value (E2-03).

Increases the motor flux when the motor is started up.

No.

b2-08

This parameter allows the magnetizing motor flux to be boosted when starting the motor. This parameter will facilitate a quick ramp-up of the torque

reference and magnetizing current reference to reduce motor slip during start. A setting of 100% equals motor no-load current E2-03. This flux level will

be applied below the minimum output frequency set to E1-09 until the DC Injection time at start (b2-03) expires. This parameter is useful when starting

motors that are relatively larger than the drive, due to the requirement for increased magnetizing current. This parameter may also compensate for reduced

starting torque due to motor circuit inefficiencies.

b2-12: Short Circuit Brake Time at Start

Sets the time for Short-Circuit Brake operation at start in units of 0.01 s. Used when restarting a coasting motor once it has stopped. Disabled when set

to 0.00.

No.

b2-12

b2-13: Short Circuit Brake Time at Stop

Sets the time for Short-Circuit Brake operation at stop in units of 0.01 s. Used to stop a motor rotating due to inertia. Disabled when set to 0.00.

No.

b2-13

b2-15: DC Injection Braking Current 2

Allows the DC Injection Current 1 to flow for the switch time set to b2-16, then switches to DC Injection Current 2. Disabled when set to 0%.

No.

b2-15

b3: Speed Search

The Speed Search function allows the drive to determine the speed of a motor shaft that is being driven by rotational inertia. Speed Search allows the

drive to determine the speed of the already rotating motor and begin to ramp the motor to a set speed without first having to bring it to a complete stop.

When a momentary loss of supply power occurs, the drive output is turned off. This results in a coasting motor. When power returns, the drive can

determine the speed of the coasting motor and start without requiring it to be brought to minimum speed.

Speed Search is performed as follows:

• Enable Power Loss Ride-Thru selection by setting L2-01 to "1" (enabled) or "2" (enabled during CPU operation).

• L5-01 determines the number of times the drive can attempt to restart after a fault occurs.

• To perform Speed Search whenever a run command is entered, set on of the multi-function inputs to External Search Reference 1 or 2 (H1-

or 62 respectively). Here, Speed Search is performed only when the run command is first entered, and an external command to perform Speed Search

is disregarded. Wait at least 2 ms before entering another external Speed Search command.

• To perform Speed Search when baseblock is released, set on of the multi-function inputs to for the baseblock command (H1-

N.C., respectively).

Note: There are two types of Speed Search available in parameter b3-24: Current Detection Speed Search and Speed Estimation Speed Search. When the Speed Search command is

entered through one of the multi-function terminals, the type of Speed Search performed is determined by b3-01. If b3-01 is disabled, then Current Detection Speed Search is

performed via one of the remote terminal inputs. If b3-01 is enabled, then Speed Estimation Speed Search is executed. The minimum baseblock time and voltage restoration

time (L2-03 and L2-04 respectively) both influence how Speed Search works.

b3-01: Speed Search Selection at Start

Enables, disables, and selects the speed search function at start.

No.

b3-01

The type of Speed Search performed is set to b3-24, while the action to take when a momentary power loss occurs is set to L2-01. When the drive is

starting back up after power is restored, the run command needs to be maintained for at least the time set to L2-02 (Momentary Power Loss Ride-Thru

Time).

YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)

Parameter Name

DC Injection Braking Time at Start

Parameter Name