YASKAWA T1000V, Техническое руководство

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5.2 b: Application
114 YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
■ b2-02: DC Injection Braking Current
Sets the DC Injection Braking current as a percentage of the drive rated current. If set to larger than 50%, the carrier
frequency is automatically reduced to 1 kHz.
The level of DC Injection Braking current affects the strength of the magnetic field attempting to lock the motor shaft.
Increasing the current level will increase the amount of heat generated by the motor windings. This parameter should
only be increased to the level necessary to hold the motor shaft.
■ b2-03: DC Injection Braking Time at Start
Sets the time of DC Injection Braking at start. It can be used to stop a coasting motor before restarting it or to apply a
braking torque at start. Disabled when set to 0.00 s.
Note: Before starting an uncontrolled rotating motor (e.g. a fan motor driven by windmill effect), DC Injection or Speed Search should
be used to either stop the motor or detect its speed before starting it. Otherwise motor stalling and other faults can occur.
■
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. Used to completely
stop a motor with high inertia load after ramp down. Increase the setting if the motor tends to coast by inertia after a stop.
■ b2-08: Magnetic Flux Compensation Value
Sets the magnetic flux compensation as a percentage of the no-load current value (E2-03) and can be used to increase the
motor flux when the motor is started up.
This parameter allows the magnetizing motor flux to be boosted when starting the motor and thereby facilitate a quick
ramp-up of the torque reference and magnetizing current reference in order to reduce motor slip during start. 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. It may be used to compensate for reduced starting torque due to motor circuit inefficiencies.
■
b2-10: DC Injection Braking Current 2
Set as a percentage of the drive rated current. If b2-10 is greater than 50%, the carrier frequency is automatically changed
to 1 kHz. Note that the motor rated current limits the amount of current that can be used for DC Injection Braking.
If one of the multi-function input terminals is set for DC Injection Braking 2 (H1- †† = 60) and that terminal is
activated, then the drive will use the current level set in b2-10 to perform DC Injection Braking.
No. Name Setting Range Default
b2-02 DC Injection Braking Current 0 to 100% 50%
No.
<1> Default setting depends on the control mode selection in parameter A1-02. The value shown here is for V/f Control.
Name Setting Range Default
b2-03 DC Injection Braking Time at Start 0.00 to 10.00 s 0.00 s
<1>
No. Name Setting Range Default
b2-04 DC Injection Braking Time at Stop 0.00 to 10.00 s 0.5 s
No. Name Setting Range Default
b2-08 Magnetic Flux Compensation Value 0 to 1000% 0%
No. Name Setting Range Default
b2-10 DC Injection Braking Current 2 0 to 100% 50%