OMRON 3G3KV frequency converter

Output side taboo: It is absolutely forbidden to connect power factor correction capacitors or noise filters on the output side of the frequency converter. At the same time, do not frequently open or close the contactor in the output circuit.

Control circuit wiring and signal definition

The control circuit is the command input channel of the "brain" of the frequency converter. The control terminal of 3G3KV has powerful functions, and the following core signals are preset at the factory:

Sequence input:

Terminal 1: Positive rotation operation/stop signal (closed positive rotation, disconnected stop).

Terminal 2: Reverse operation/stop signal.

Terminal 3: Fault reset signal (closed reset).

Terminals 4 and 5: Multi functional contact input (factory preset terminal 4 for external faults and terminal 5 for multi-stage speed command 1).

Terminal 6: Sequence input common terminal.

Analog input:

Terminal 10: Frequency setting power supply (12V, 20mA).

Terminal 8: Frequency command (0-10V, 20k Ω).

Terminal 9: Frequency command (4-20mA, 250 Ω).

Terminal 11: Control circuit common terminal (0V).

Sequence output:

Terminals 13 and 14: Multi function optocoupler output (factory preset terminal 13 for "running" signal and terminal 14 for "consistent frequency" signal).

Terminal FLT-A/B/C: Fault relay contact output (A-C closed and B-C disconnected in case of fault).

Key wiring guidelines:

The control signal line must be wired separately from the power line to prevent interference.

The simulated frequency given signal must use shielded wire and be properly grounded.

The length of the control signal line shall not exceed 50 meters.

If a transistor is used to drive the contact input, its specifications must meet 50V, 50mA or above, and the leakage current when turned off should be less than 100 μ A.

If driving inductive loads such as relays, a freewheeling diode must be connected in reverse parallel at the optocoupler output terminal.

Core parameter settings and functional analysis

The functionality of 3G3KV is configured through a series of constants. Constants are grouped by function and access permissions are controlled by the value of constant No.00 (1: basic function only; 2: first and second groups; 3: first to third groups; 5: all). The following are the most commonly used and critical parameters.

1. Operation mode selection (constant No.01)

This parameter determines where the frequency converter receives the start command and frequency command.

Set value x0xx: The frequency command comes from the external terminal (8/9).

Set value x1xx: The frequency command comes from the digital operator (Fxxxxx).

Set value 0xx0: The running command comes from an external terminal.

Set value 1xx1: The run command comes from the RUN key of the numeric operator.

Set value x0xx: The stop mode is deceleration stop.

Set value x1xx: The stopping method is free sliding stop.

The factory default is 0011, which means the digital operator controls the start stop and frequency setting.

2. V/f characteristic setting (constant No.02-08)

This is the core of matching the frequency converter with the motor. The factory default is 60Hz saturation mode, suitable for standard 60Hz motors. The parameters include:

No.02: Maximum output frequency (0.1-400Hz, factory 60Hz)

No.03: Maximum voltage (200V level, maximum 200V)

No.04: Maximum voltage frequency (fundamental frequency, factory 60Hz)

No.05: Intermediate output frequency (factory 1.5Hz)

No.06: Intermediate output frequency voltage (factory 12V)

No.07: Minimum output frequency (0.1-10Hz, factory 1.5Hz)

No.08: Minimum output frequency voltage (factory 12V)

By adjusting these points, any V/f curve can be formed to accommodate special loads. Attention: Setting too high a voltage in the low-frequency range (below 3Hz) can cause motor overheating or frequency converter failure.

3. Acceleration and deceleration time (constant No.09-12)

Determine the soft start and soft stop characteristics of the motor. The setting range is 0.0 to 600.0 seconds, indicating the time required to accelerate from 0Hz to the maximum frequency (No.02). The factory default is 10 seconds. Acceleration/deceleration time 1 (No.09/10) or 2 (No.11/12) can be switched through external terminals.

4. Multi speed operation (constants No.13-16, 32, 33)

By combining the multifunctional input terminals 4 and 5, up to 4 segments of fixed frequency operation can be achieved. Need to set:

No.13-16: Corresponding to 4 frequency commands respectively.

No.32/33: Set the corresponding terminal function to "3" (multi speed command 1) or "4" (multi speed command 2). The factory preset terminal 4 (No.32) is set to 1 (external fault), and terminal 5 (No.33) is set to 3 (multi-stage speed 1).

5. Electronic thermal overload protection (constant No.18,19)

Protect the motor from overheating.

No.18: Select the protected object. Set the first digit to 0 to enable protection, set it to 1 to disable. Set the second digit to 0 for the standard motor, and set it to 1 for the frequency conversion dedicated motor.

No.19: It must be set to the rated current value (A) on the motor nameplate. This is the basis for the correct operation of electronic thermal protection.