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Chapter 4
4.2.19 DC braking (DB) setting
The DC braking function allows you to apply DC braking to the motor
according to the load on the motor.
You can control DC braking in two ways: the external control through
signal input to intelligent input terminals and the internal control to be
performed automatically when the motor is started and stopped.
Note that the motor cannot be stopped by DC braking if the load on
the motor produces a large moment of inertia.
Item
Function code
DC braking enable
DC braking
frequency setting
DC braking wait
time
DC braking force
during deceleration/
DC braking force for
starting
DC braking time for
deceleration
DC braking/edge or
level detection for
[DB] input
DC braking time for
starting
DC braking carrier
frequency setting
(NOTE) <>:applied for 75 to 150kW
(1) Carrier frequency for DC braking
Use the DC braking carrier frequency setting (A059) to specify the carrier frequency for DC braking. But the raking
power reduced is reduced when 5Hz (up to 55kW) or 3Hz (75-150kW) are set as shown below. For detailed
decreasing ratio, "DC braking limiter" is to be referred.
Maximum braking
force (%)
100
CT mode
90
80
(75)
70
60
50
(46)
40
(34)
30
(22)
20
10
0
3
5 7
9
11
13
DC braking carrier frequency(kHz)
DC braking force limiter(0.4-55kW)
Data or range of data
A051
A052
0.00 to 60.00 (Hz)
A053
0.0 to 5.0 (s)
CT mode :
A054/
0. to 100. (%)<0. to 80.(%)>
A057
VT mode :
0. to 70. (%)<0. to 50.(%)>
A055
0.0 to 60.0 (s)
A056
A058
0.0 to 60.0 (s)
CT mode :
0.5 to 15.0 (kHz)<0.5 to 10.0(kHz)>
A059
VT mode :
0.5 to 12.0 (kHz)<0.5 to 8.0(kHz)>
Maximum braking
force (%)
100
VT mode
90
80
(70)
70
(58)
60
50
(46)
40
(34)
30
20
(10)
10
0
15
3
5 7
9
11
A051: DC braking enable
A052: DC braking frequency setting
A053: DC braking wait time
A054: DC braking force during deceleration
A055: DC braking time for deceleration
A056: DC braking/edge or level detection for
A057: DC braking force for starting
A058: DC braking time for starting
A059: DC braking carrier frequency setting
C001 to C008: Terminal [1] to [8] functions
00
Internal DC braking is disabled.
01
Internal DC braking is enabled.
Internal DC braking is enabled. (The braking
02
operates only with the set braking frequency.)
With internal DC braking enabled, DC braking is
started when the output frequency reaches the
set braking frequency.
The DC braking wait time specifies the delay in
starting DC braking after the set braking time
has elapsed or the DB terminal has been turned
on.
"0" specifies the smallest force (zero current);
"100" specifies the largest force (rated current).
This setting is valid for the external DC braking
in edge mode or for the internal DC braking.
00
Edge mode (See Examples 1-a to 6-a.)
01
Level mode (See Examples 1-b to 6-b.)
This setting is valid for the internal DC braking.
DC braking is started when the motor-start
command is input.
Unit: kHz
Maximum braking
force (%)
100
CT mode
90
(80)
80
70
60
(60)
50
40
30
(22)
20
(10)
10
0
13
15
5
3
DC braking carrier frequency(kHz)
DC braking force limiter(75-150kW)
4-20
Explanation of Functions
Related code
[DB] input
Description
Maximum braking
force (%)
100
VT mode
90
80
70
60
(50)
50
(40)
40
30
(20)
20
(10)
10
0
7
9
10
5
3
(25)
(10)
7
9
10
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