YASKAWA U1000 iQpump Drive, Техническое руководство

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No. Name Setting Range Default
b2-02 DC Injection Braking Current 0 to 100% 50%
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. Do not set this parameter higher
than the level necessary to hold the motor shaft.
n b2-03: DC Injection Braking Time at Start
Sets the time of DC Injection Braking (Zero Speed Control in CLV and CLV/PM) at start. Used to stop a coasting motor before
restarting it or to apply braking torque at start. Disabled when set to 0.00 s.
No. Name Setting Range Default
b2-03 DC Injection Braking Time at Start 0.00 to 10.00 s 0.00 s
Note: Before starting an uncontrolled rotating motor (e.g., a fan motor driven by windmill effect), use DC Injection or Speed Search to stop the
motor or detect motor speed before starting it. Otherwise, motor stalling and other faults can occur.
n b2-04: DC Injection Braking Time at Stop
Sets the time of DC Injection Braking (Zero Speed Control in CLV and CLV/PM) at stop. Used to completely stop a motor
with high inertia load after ramp down. Increase the value if the motor still coasts by inertia after it should have stopped.
Disabled when set to 0.00 s.
No. Name Setting Range Default
b2-04 DC Injection Braking Time at Stop 0.00 to 10.00 s
Determined by
A1-02
n b2-08: Magnetic Flux Compensation Value
Sets the magnetic flux compensation at start as a percentage of the no-load current value (E2-03). This function allows for the
development of more flux to facilitate starting machines that require high starting torque or motors with a large rotor time
constant.
No. Name Setting Range Default
b2-08 Magnetic Flux Compensation Value 0 to 1000% 0%
When a Run command is issued, the DC current level injected into the motor changes linearly from the level set to b2-08 to
the level set to E2-03 within the time set to b2-03.
When b2-08
≠
0%, the current will flow for the time set in b2-03 (DC Injection Braking Time at Start) when DC Injection
Braking starts. The current will change linearly from the setting of b2-08 to the setting of E2-03.
The level of the DC current injected to the motor is limited to 80% of the drive rated current or to the motor rated current,
whichever value is smaller.
Note: 1. If b2-08 is set below 100%, it can take a relatively long time for flux to develop.
2. If b2-08 is set to 0%, the DC current level will be the DC Injection current set to b2-02.
3. As DC Injection can generate a fair amount of noise, b2-08 may need to be adjusted to keep noise levels acceptable.
u
b3: Speed Search
The Speed Search function allows the drive to detect the speed of a rotating motor shaft that is driven by external forces and
start the motor operation directly from the detected speed without first stopping the machine.
Example: When a momentary loss of power occurs, the drive output shuts off and the motor coasts. When power returns, the
drive can find the speed of the coasting motor and restart it directly.
Enabling Speed Search for PM motors only requires setting parameter b3-01 to 1. The drive offers current detection and speed
estimation Speed Search for induction motors. Parameter b3-24 selects the speed search method for induction motors. Both
methods and relevant parameters are explained below.
Speed Search start timing differs depending on whether operation is after a momentary power loss (L2-01 = 1 or 2) or after
the Speed Search at start (b3-01 = 1). The operation timing of the Speed Search after a momentary power loss is shown in
Figure 5.17 . The operation timing after the Speed Search at start is shown in Figure 5.18 .
5.2 b: Application
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual 197
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Parameter Details