4-151
DC Injection Braking Operation (V/f + SLV Mode)
When DC Injection braking is active DC voltage is applied to the motor, increasing the braking current and
resulting in an increase in the strength of the magnetic field trying to hold the motor shaft.
To enable DC injection braking during a start operation set the DC injection braking current (07-07) to a value
greater than
0. DC injection braking at start can be used to prevent “wind milling effect” in fan applications.
To enable DC injection braking during a stop operation set the DC injection braking current (07-07) and the DC
injection braking time at stop (07-08) to a value greater than 0.
Notes:
- Increasing the DC braking time (07-08, 07-16) can reduce the motor stop time.
- Increasing the DC braking current (07-07) can reduce the motor stop time.
DC braking operation can be controlled via any one of the multi-function input terminals (03-00 to 05) set to
function 33. Refer to figure 4.3.57a and 4.3.57b for DC braking operation.
07-34
Start short-circuit braking time
Range
【
0.00~100.00
】
Sec
07-35
Stop Short-circuit braking time
Range
【
0.00~100.00
】
Sec
07-36
Short-circuit braking current limited
Range
【
0.0~200.0
】
%
Short-circuit braking is available only in PMSLV control mode (00-00 = 5) and functions switching the IGBTs to
producing braking torque. Use parameters 07-06, 07-34 and 07-36 to adjust braking settings. The value of 07-36
is set as a percentage of the inverter rated current.
When 07-35 is set to 0 short-circuit braking during stop is disabled.
Short-circuit Braking can be controlled via any one of the multi-function input terminals (03-00 to 05) set to
function 65.
07-09
Stop Mode Selection
Range
【
0
】
:
Deceleration to stop
【
1
】
:
Coast to stop
【
2
】
:
DC braking to stop
【
3
】
:
Coast to stop with timer
When a stop command is issued the inverter stops according to the stop method selected. There are four types of
stop modes:
