n
b2-01: Zero Speed Level (DC Injection Braking Start Frequency)
Active when “Ramp to Stop” is selected as the stopping method (b1-03 = 0).
No.
Name
Setting Range
Default
b2-01
Zero Speed Level (DC Injection Braking Start Frequency)
0.0 to 10.0 Hz
Determined by
A1-02
The function triggered by parameter b2-01 depends on the control mode that has been selected.
V/f and OLV/PM (A1-02 = 0, 5)
For these control modes, parameter b2-01 sets the starting frequency for DC Injection Braking at Stop. When the output
frequency falls below the setting of b2-01, DC Injection Braking is enabled for the time set in parameter b2-04.
Output
frequency
Time
b2-04
DC Injection
Braking
E1-09 Min. Frequency
b2-01 Zero Speed Level
Figure 1.8 DC Injection Braking at Stop for V/f
Note:
If b2-01 is set to a smaller value than E1-09 (Minimum Output Frequency), then DC Injection Braking will begin when the frequency falls
to the E1-09 value.
n
b2-02: DC Injection Braking Current
Sets the DC Injection Braking current as a percentage of the drive rated current.
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 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 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
0.00 s
n
b2-09: Motor Pre-Heat Current 2
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-
oo
= 50).
No.
Name
Setting Range
Default
b2-09
Motor Pre-Heat Current 2
0 to 100%
5%
1.2 b: Application
22
YASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual
