6-17
6
îš‹ Using the DC Injection Brake
The DC injection brake can be used to stop a coasting motor before restarting it or to hold it at the deceleration
end when the inertia is large. Set parameter b2-03 to apply DC injection to the motor, before it starts to accel-
erate. Set parameter b2-04 to apply a DC injection brake to the motor at stopping.
Setting b2-03/04 to 0 to disables the DC injection brake at start/stop.
Set the DC injection brake current using b2-02.
îš„Related Parameters
Multi-function Digital Inputs (H1-01 to H1-05)
îš„Timer Controlled DC Injection Brake
The DC injection time for start can be set in parameter b2-03, the current value for the stop can be set in
parameter b2-02. After start, when the DC injection time b2-03 has elapsed, the inverter starts the acceleration
starting from the minimum frequency. When during deceleration the frequency falls below the b2-01 level,
DC injection is started and kept for the time in parameter b2-04. If b2-01 is lower than the minimal frequency
E1-09, the DC injection is started when the frequency falls below E1-09 during deceleration.
Fig 6.20 DC Injection Brake Time Chart
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
b2-01 Zero speed level (DC injection braking starting frequency)0.5 HzNo AAAA
b2-02 DC injection braking current 50% No A A A No
b2-03 DC injection braking time at start 0.00 s No AAAA
b2-04 DC injection braking time at stop 0.50 s No AAAA
Set
Value
Function
Control Methods
V/f
V/f
with
PG
Open
Loop
Vector
Closed
Loop
Vector
60 DC injection brake command Yes Yes Yes Yes
Frequency
Reference
RUN
b2-03
DC inj. time at start
E1-09
Min. frequency
b2-01
DC inj. start
frequency
b2-04
DC inj. time
at stop
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