YASKAWA CIMR-ZU A Series Programming Manual page 30

1 2 b Application
b2 2 DC In ection Bra in Current
Sets the DC Injection Braking current as a percentage of the drive rated current. The carrier frequency is automatically reduced
to 1 kHz when this parameter is set to more than 50%.
No
b2-02
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.
b2 DC In ection Bra in
Sets the time of DC Injection Braking 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
b2-03
Before starting an uncontrolled rotating motor (e.g., a fan motor driven by windmill effect), use DC Injection or Speed Search to stop the
Note:
motor or detect motor speed before starting it. Otherwise, motor stalling and other faults can occur.
b2 DC In ection Bra in
Sets the time of DC Injection Braking 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
b2-04
b2 Motor Pre
Determines the percentage of motor rated output current that will be used for the motor pre-heat function. This function can
be useful in applications where the motor sits for extended periods of time in humid conditions. Motor pre-heating can only
be initiated by closing a digital input programmed as a Motor Pre-Heat 2 (H1-
No
b2-09
b2 12 S ort Circuit Bra e ime at Start
Short Circuit Braking can be used in OLV/PM. Shorting all three motor phases produces a braking torque in the motor and
can stop a coasting motor before starting it again. Disabled when set to 0.00 s.
No
b2-12
Short Circuit Braking cannot prevent a PM motor from being rotated by an external force. Use DC Injection to prevent the load from rotating
Note:
the motor.
Name
DC Injection Braking Current
ime at Start
Name
DC Injection Braking Time at Start
ime at Stop
Name
DC Injection Braking Time at Stop
eat Current 2
Name
Motor Pre-Heat Current 2
Name
Short Circuit Brake Time at Start
Settin an e
0 to 100%
Settin an e
0.00 to 10.00 s
Settin an e
0.00 to 10.00 s
= 50).
Settin an e
0 to 100%
Settin an e
0.00 to 25.50 s
De ault
50%
De ault
0.00 s
De ault
0.00 s
De ault
5%
De ault
0.00 s