Ing Inverter Inputs; Controlling Inverter Torque - Omron MX2 DEVICENET OPTION BOARD User Manual

Overriding Inverter inputs
4-2-4 Stopping the Motor – Free-running
4-2-5 Changing Speed Reference and Speed Monitor Scaling
4-3 Overriding Inverter inputs
Step 1
Step 2
Step 3
4-4

Controlling Inverter Torque

!Caution
An alternative to Clear the run bits (FWD or REV) to bring the motor to a con-
trolled (decelerated) stop of step 6 is a free-run stop. The Inverter stops con-
trolling the motor, and the motor coasts to a stop. Set C001 = 11 (FRS: free-
run stop) to assign intelligent input terminal 1 as free-run stop enable. Restart
the Inverter or reset the Option Board for the new settings to take effect. Set
the terminal input 1 to ON to enable free-run stop. During a free-run stop,
Rotation Speed Monitor immediately drops to 0 and ARF bit is cleared.
Rotational Speed Reference and Rotational Speed Monitor are word regis-
ters. The scaling of these values depend on the inverter's Motor poles setting
P049:
1. In case P049 has non-zero value, the Unit is RPM.
2. In case P049 is set to zero, the Unit depends on the inverter mode. If the
inverter is in High Frequency (HF) mode, the Unit is 0.1 Hz. The unit will be
0.01 Hz in other modes.
For the second option (Unit is either 0.1 Hz or 0.01 Hz), the maximum fre-
quency which can be set is 400.00 Hz. Please refer to MX2 User's manual
(Cat. No. I570) for instructions about inverter modes and parameter P049.
By using the Option Boards input override functionality, the Inverter Intelligent
Terminal Functions can be controlled from the network.
The following example explains how to make use of the Option Board to over-
ride the input function Free Run Stop (FRS) using the IO data.
Configure the Option Board and Network as explained in sections 3-1 Installa-
tion of EDS files on page 15 and 3-2 Configuring the Option Board on page 15
with Extended Control IO and Multi-function IO monitor (Output assembly
101, Input assembly 151). There are two options:
• When using Fixed allocation method of configuring the Master, select
P046 = 4.
• When using User-set allocation, select the Extended Control IO and Multi-
function IO monitor assemblies.
Set C003 = 11 (FRS: Free Run Stop) to assign intelligent input terminal 3.
The output words of assembly 101 contain the CI3 bit (see table 16), which
overrides input terminal 3. Set this bit to enable the free run stop.
Please note that as an alternative to override inputs using this assembly with
bits CI3 to CI7, also the explicit message writing the Discrete Input Point
Object (0x08) can be used. Please refer to APPENDIX B Assembly Specifica-
tion on page 43 and APPENDIX E DeviceNet Explicit Messages on page 71).
In addition to Speed control, the MX2-A@ Inverter allows direct control of the
motor torque.
Before following this example, disconnect your motor from any load to prevent
injury or damage to property.
The following example explains how to make use of the Option Board to con-
trol the motor torque:
Section 4-3
23