B2: Dc Injection Braking - Omron JZA User Manual

5.2 b: Application
n b1-17: Run Command at Power Up
This parameter is used to determine whether an external Run command that is active during power up of the drive will
start the drive or not.
No.
b1-17
Setting 0: Run Command at Power Up is not Issued
The Run command has to be cycled to start the drive.
Note: For safety reasons, the drive is initially set up not to accept a Run command at power up (b1-17 = "0"). If a Run command is issued at
power up, the RUN indicator LED will flash quickly. Change parameter b1-17 to 1 if a Run command active at power up shall be accepted
by the drive.
Setting 1: Run Command and Power Up is Issued
An external Run command active during power up is issued and the drive starts to operate the motor as soon as it gets
ready for operation (i.e. once the internal start up process is complete).
WARNING! Sudden Movement Hazard. If b1-17 is set to 1 and an external Run command is active during power up, the motor will
begin rotating as soon as the power is switched on. Proper precautions must be taken to ensure that the area around the motor is safe
prior to powering up the drive. Failure to comply may cause serious injury.
u

b2: DC Injection Braking

These parameters determine how the DC Injection Braking feature operates. Parameters involving the starting frequency,
current level, braking time are located here.
n 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.
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. This parameter should only
be increased to the level necessary to hold the motor shaft.
n 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.
No.
b2-03
Note: Before starting an uncontrolled rotating motor (e.g. a fan motor driven by windmill effect), use DC Injection to stop the motor before
starting it. Otherwise motor stalling and other faults can occur.
n b2-04: DC Injection Braking Time at Stop
When the output frequency falls below the minimum output frequency setting E1-09, the drive applies DC injection for
the time set in b2-04. 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.
No.
b2-04
76
Parameter Name
Run Command at Power Up
Name
DC Injection Braking Current
Name
DC Injection Braking Time at Start
Name
DC Injection Braking Time at Stop
Setting Range
0 or 1
Setting Range
0 to 75%
Setting Range
0.00 to 10.00 s
Setting Range
0.00 to 10.00 s
SIEP C710606 33A OYMC AC Drive – J1000 User Manual
Default
0
Default
50%
Default
0.00 s
Default
0.50 s