Instruction manual
Table Of Contents
- Preface
- Safety Precautions
- Table of Contents
- Warnings, Cautions and Conformity
- Chapter 1 Drive Model Identification
- Chapter 2 Mounting and Wiring the Inverter
- Chapter 3 Operation using the Keypad
- Chapter 4 Function Codes / Parameters
- Chapter 5 Check Motor Rotation and Direction
- Chapter 6 Speed Reference Command Configuration
- Chapter 7 Operation Method Configuration (Run / Stop)
- Chapter 8 Motor and Application Specific Settings
- Chapter 9 Using PID Control for Constant Flow / Pressure Applications
- Chapter 10 Troubleshooting
- 10.1 Protective Functions
- 10.2 Before Proceeding with Troubleshooting
- 10.3 If Neither an Alarm Code Nor "Light Alarm" Indication Appears on the LED Monitor
- 10.4 If an Alarm Code Appears on the LED
- 10.5 If the “Light Alarm” Indication Appears on the LED Monitor
- 10.6 If an Abnormal Pattern Appears on the LED Monitor except Alarm Codes and "Light Alarm" Indication
- 10.7 If the Inverter is Running on Single-Phase Power
- Chapter 11 Specifications
4-50
F18
Bias (Frequency command 1) (Refer to F01.) page 4-26
F20 to F22
H95
DC Braking 1 (Braking starting frequency, Braking level, and Braking time)
DC Braking (Braking response mode)
F20 through F22 specify the DC braking that prevents motor 1 from running by inertia during decelerate-to-stop
operation.
If the motor decelerates-to-stop by turning OFF the run command or by decreasing the reference frequency below
the stop frequency, the inverter activates the DC braking by injecting current at the braking level (F21) during the
braking time (F22) when the output frequency is at or below the DC braking starting frequency (F20).
Setting the braking time to "0.0" (F22 = 0) disables the DC braking.
Braking starting frequency (F20) Data setting range: 0.0 to 60.0 (Hz)
F20 specifies the frequency at which the DC braking starts its operation during motor decelerate-to-stop state.
Braking level (F21) Data setting range: 0 to 80 (%) Variable/Constant torque inverters
0 to 100 (%) CT-Vector-mode inverters
F21 specifies the output current level to be applied when the DC braking is activated. The function code data
should be set, assuming the rated output current of the inverter as 100%, in increments of 1%.
The inverter rated output current differs between the variable torque and constant torque modes.
0% to 100% for inverters of 7.5 HP or below.
Braking time (F22) Data setting range: 0.01 to 30.00 (s), 0.00 (Disable)
F22 specifies the braking period that activates DC braking.
Braking response mode (H95)
H95 specifies the DC braking response mode. When vector control without/with speed sensor is selected, the
response is constant.
Data for H95
Characteristics
Note
0
Slow response. Slows the rising edge of the
current, thereby preventing reverse rotation at
the start of DC braking.
Insufficient braking torque may result at
the start of DC braking.
1
Quick response. Quickens the rising edge of the
current, thereby accelerating the build-up of the
braking torque.
Reverse rotation may result depending
on the moment of inertia of the
mechanical load and the coupling
mechanism.