Emotron VS Series Quick Start Guide
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When the running frequency decreases to the initial frequency of stop DC braking, the AC drive
stops output for a certain period and then starts DC braking. This prevents faults such as over current
caused due to DC braking at high speed.
Stop DC braking time:
This parameter specifies the holding time of DC braking. If it is set to 0, DC braking is cancelled.
ATTENTION:
If there is a DC brake signal of external terminal at stop, then the DC brake time takes the bigger
value between the active time of the terminal and the setting time of b1.16.
The stop DC braking process is shown in the following figure.
Figure 6-5 Stop DC braking process
Output frequency(Hz)
Initial frequency of stop
DC braking
Time
(
S
)
Waiting time of stop
DC braking
Stop DC braking
time
Run command
Output voltage
RMS
Time
(
S
)
Fig 6-5 Stop DC braking process
b1.17
Dynamic brake
Range:0
~
3
Default: 0
When dynamic brake is enabled, the electric energy generated during Decel shall be converted
into heat energy consumed by brake resistor, so as to attain rapid Decel. This brake method applies to
brake of high-inertia load or the situations that require quick stop. In such a case, it is necessary to
select appropriate dynamic brake resistor and break unit. The AC drives equal and below 30kW is
provided with a standard built-in brake unit. Built-in brake unit is optional for AC drive 37kW
~
75kW.
0: Disabled
1: Enabled
2: Enabled at running
3: Enabled at deceleration
b1.18
Voltage of dynamic brake
Range: 280
~
400V
(220V inverter)
Default: 350V
Range: 480
~
800V
(415V inverter)
Default: 700V
This parameter takes effect only to the drives with built-in brake unit.
When bus voltage of AC drive attains the value of b1.18, dynamic brake shall perform. The energy
shall be rapidly consumed through brake resistor. This value is used to regulate the brake effect of
brake unit.
b1.19
Brake use ratio
Range:5.0
~
100.0%
Default:100.0%
It is valid only for the AC drive with internal braking unit and used to adjust the duty ratio of the
braking unit. The larger the value of this parameter is, the better the braking result will be. However,
too larger value causes great fluctuation of the AC drive bus voltage during the braking process.
b1.20
0Hz Output selection
Range: 0
~
1
Default: 0
0: No voltage output
1: Voltage output
b1.21
Auto-start of power-on again
Range: 0
~
1
Default: 0
b1.22
Waiting time between
Range: 0.0
~
10.0s
Default: 0.5s