Omron 3G3RX Quick Start Manual page 24

RX Quick Start Guide
•
DC braking by frequency detection can be selected setting A051 to "02" (Frequency detection). In this case DC braking oper-
ates when the output frequency comes down to the one you specified in A052 while the RUN command is still active. Exter-
nal DB and internal DC braking are invalid during the frequency detection mode.
FW
ON
F-SET
A052
F-OUT
Eample 1: Step change in F-SET
•
Last option is to trigger the DC injection by a digital input when the terminal (DB) is turned ON. Set parameters A053 and
A054 to setup this function. There are several cases depending on the motor rotation and Run command status.
FW or RV DI are ON
1
[FW,RV]
0
1
[DB]
0
F-OUT
DC braking at startup is also possible by independent setup of parameters A057 and A058. This is useful in applications were
load should be totally stopped before starting the movement.
Parameter
A051
A052
A053
A054
A055
A056
A057
A058
A059
Be careful to avoid specifying too long braking time or too high carrier frequency that can cause motor overheating. If you use
DC braking is recommended to use motors with a built-in thermistor and wire it to inverter's thermistor input.
22
DB
Run from operator
1
0
1
0
t
Parameter Name
DC injection braking selection
DC injection braking frequency
DC injection braking delay time
DC injection braking power
DC injection braking time
DC injection braking method selec-
tion
Startup DC injection braking power
Startup DC injection braking time
DC injection braking carrier fre-
quency
FW
ON
F-SET
A052
F-OUT
DB DB
Example 2: Analog change in F-SET
Run from operator with delay
1
0
1
0
t
Description
00: OFF (Disabled)
01: ON (Enabled)
02: ON (FQ) (Frequency control [A052 set value])
0.00 to 400.00 Hz
The delay from the end of controlled deceleration to start of DC
braking (motor free runs until DC braking begins)
0.0 to 5.0 s
0 to 100% (0.4 to 55 kW)
0 to 80% (75 to 132 kW)
Sets the duration for DC braking
0.0 to 60.0 s
00: Edge operation
01: Level operation
0 to 100% (0.4 to 55 kW)
0 to 80% (75 to 132 kW)
Sets the duration for DC braking
0.0 to 60.0 s
Carrier frequency of DC braking performance
0.5 to 15.0 kHz (0.4 to 55 kW)
0.5 to 10.0 kHz (75 to 132 kW)
DB
delay
A053
t
RX Quick Start Guide