
4-103
Note:
• When 07-06 < 01-08, DC injection braking starting frequency becomes frequency set in parameter 01-08.
• Continuous use of short-circuit braking may damage internal IGBTs.
• Short-circuit braking is controlled by multi-function input option 65.
07-07
DC Injection Braking Level Default: 50
Range
【
0–100
】
%
07-08
DC Injection Braking Time Default: 0.5
Range
【
0.00–100.00
】
Sec
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 by any of the multi-function input terminals (03-00 to 05) set to function 33.
See parameters 07-11 and 07-15 for more DC Injection options.
07-09
Stop Mode Selection Default: 0
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 AC Drive stops according to the stop method selected. There are four types of
stop modes:
07-09 =0: Deceleration to stop
When a stop command is issued, the motor will decelerate to the minimum output frequency (01-08) Fmin and then
stop. Deceleration rate depends on the deceleration time (factory default: 00-15).
When the output frequency reaches the DC braking stop frequency (07-06) or the minimum output frequency (01-08),
DC injection braking is activated and the motor stops.
Output frequency when stop command is issued
Deceleration time = × deceleration time setting
Maximum output frequency F
max
(01-02)