Omron 3G3RX - Page 24

RX Quick Start Guide
22 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.
• 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.
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.
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.
Parameter Parameter Name Description
A051 DC injection braking selection 00: OFF (Disabled)
01: ON (Enabled)
02: ON (FQ) (Frequency control [A052 set value])
A052 DC injection braking frequency 0.00 to 400.00 Hz
A053 DC injection braking delay time 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
A054 DC injection braking power 0 to 100% (0.4 to 55 kW)
0 to 80% (75 to 132 kW)
A055 DC injection braking time Sets the duration for DC braking
0.0 to 60.0 s
A056 DC injection braking method selec-
tion
00: Edge operation
01: Level operation
A057 Startup DC injection braking power 0 to 100% (0.4 to 55 kW)
0 to 80% (75 to 132 kW)
A058 Startup DC injection braking time Sets the duration for DC braking
0.0 to 60.0 s
A059 DC injection braking carrier fre-
quency
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)
A052
FW
ON
F-SET
DB
Eample 1: Step change in F-SET
F-OUT
FW
ON
F-SET
Example 2: Analog change in F-SET
F-OUT
DB DB DB
A052
[FW,RV]
1
0
[DB]
1
0
F-OUT
FW or RV DI are ON
t
1
0
1
0
t
1
0
1
0
t
delay
Run from operator
Run from operator with delay
A053