OMRON 3G3MV Inverter Practical Guide

It is strictly prohibited to install contactors on the output side for frequent starting and stopping, otherwise it may damage the frequency converter.

2. Control circuit terminals

The control terminal is located under the front cover, and the main signals include:

Terminal symbol function (default) specifications

S1 multifunctional input 1 forward/stop optocoupler isolation, 8mA/24VDC

S2 multifunctional input 2 reverse/stop as above

S3 multifunctional input 3 external fault (normally open) as above

S4 multifunctional input 4 fault reset as above

S5 multifunctional input 5 multi-stage speed command 1 as above

S6 multifunctional input 6 multi-stage speed command 2 as above

S7 multifunctional input 7-point dynamic frequency command as above

SC sequence input common terminal - common terminal

FS frequency setting power supply 12V/20mA for external potentiometer

FR frequency given input 0-10V input impedance 20k Ω

FC frequency given common terminal 0V -

RP pulse input 0-33kHz H: 3.5-13.2V, L: ≤ 0.8V

MA/MB/MC fault relay output normally open/normally closed contact 250VAC/30VDC, 1A

P1/PC, P2/PC multifunctional optocoupler output default running/frequency consistent 48V/50mA

Important settings:

SW1 is used to select NPN (default) or PNP input mode. If using an external 24V power supply with a common positive pole, switch SW1 to the PNP position.

Pin1 of SW2 is used for RS-422/485 terminal resistor (end node needs to be ON).

Pin2 of SW2 is used to select the frequency setting mode: OFF=voltage input (0-10V), ON=current input (4-20mA).

Example of 3-wire wiring: n052 (multi-function input 3) needs to be set to 0, where S1=RUN (normally open), S2=STOP (normally closed), and S3=direction.

Detailed explanation of core parameter settings and functions

The parameters of 3G3MV are grouped by function, and the accessible groups (0-4, 5, 8-11, etc.) are controlled through n001 (parameter write prohibition/initialization). The following are the most commonly used and critical parameters.

1. Basic operating parameters (functional group 1)

Parameter Name Range Factory Value Description

N002 control mode selection 0/1 0=V/f control, 1=vector control (open-loop)

The n003 RUN command selects 0-3 0=operator, 1=control terminal, 2=RS-422/485, 3=DeviceNet

N004 frequency setting selection 0-9 0=operator, 1=frequency reference 1 (n024), 2=0-10V, 3=4-20mA, 5=pulse input, 6=communication, etc

N005 stop method 0/1 0=deceleration stop, 1=free sliding stop

N006 reversal prohibited 0/1 0=reversal allowed, 1=reversal prohibited

N007 STOP key function 0/1 0=STOP key is valid in remote mode, 1=invalid

N008 local frequency setting 0/1 0=FREQ adjuster, 1=operator button (n024)

2. V/f characteristic settings (n011-n017)

Used to match motor characteristics. The factory produces a 60Hz saturated type. The parameter relationship must satisfy: n016 ≤ n014<n013 ≤ n011.

Parameter Name Range Factory Value

N011 maximum frequency (FMAX) 50-400Hz 60.0Hz

N012 maximum voltage (VMAX) 0.1-255V (200V level) 200.0V

N013 maximum voltage frequency (FA) 0.2-400Hz 60.0Hz

N014 intermediate output frequency (FB) 0.1-399.9Hz 1.5Hz

N015 intermediate frequency voltage (VC) 0.1-255V 12.0V

N016 minimum output frequency (FMIN) 0.1-10Hz 1.5Hz

N017 minimum frequency voltage (VMIN) 0.1-50V 12.0V

Note: The voltage value of 400V level is twice that of 200V level. If n014 is equal to n016, then n015 is ignored.

3. Acceleration and deceleration time

Parameter Name Range Factory Value Description

N019 acceleration time 1 0.0-6000s 10.0s 0Hz → maximum frequency

N020 deceleration time 1 0.0-6000s 10.0s maximum frequency → 0Hz

N021 acceleration time 2 is the same as 10.0s, switched through multifunctional input

N022 deceleration time 2 is the same as 10.0s -

N041-044 Acceleration/Deceleration Time 3/4 Same as 10.0s Switching through Two Position Selection Combination

Actual acceleration and deceleration time=set value x (frequency given/maximum frequency)

4. Motor protection parameters (n036-n038)

Electronic thermal overload protection (OL1) is used to prevent motor overheating.

Parameter Name Range Factory Value Description

The rated motor current of N036 is 0.0-150%, and the rated capacity of the frequency converter is set as the rated current on the motor nameplate; Set 0.0 to disable protection

N037 motor protection characteristics 0-200=universal motor, 1=variable frequency dedicated motor, 2=unprotected

N038 motor protection time 1-60min 8min electronic thermal protection time constant

Important: If a frequency converter drives multiple motors, n037 must be set to 2 (unprotected) and independent thermal relays must be installed on each motor.

5. Multiple speed and frequency settings

The internal frequency references 1-8 (n024-n031) and 9-16 (n120-n127) can be selected through a combination of multifunctional inputs (S5/S6, etc.). The jog frequency is set by n032 (default 6.0Hz).

The upper and lower limits (n033/n034) of the frequency are set as a percentage of the maximum frequency. If the lower limit value is less than the minimum output frequency, the frequency converter will have no output when the frequency is set below the lower limit.

6. DC braking (n089-n091)