On supported G120 control units, macro 1 selects two preset speeds and macro 3 selects four. Multiple active selections can add together. Confirm the input mapping and units for your control unit before entering values.
Choose the macro for your application
Fixed speeds suit a machine with repeatable operating stages: a slow inspection speed, a transfer speed and a production speed. Write those operating states down before changing the drive. A useful design sheet records the permitted direction, requested speed, selection contacts and stopping requirement for each state.
This guide uses the documented CU240E-2 macro arrangement. The older G120C manual provides a similar fixed-speed example. These are identified reference configurations, not a promise that every G120 variant has the same terminals or macro choices. Match the control-unit order number, firmware and manual first.
| Selection | Macro 1 | Macro 3 |
|---|---|---|
| Preset parameters | p1003 and p1004 | p1001 through p1004 |
| Start and direction | DI0: ON/OFF1 right; DI1: ON/OFF1 left | DI0: ON/OFF1 plus fixed speed 1 |
| Other speed inputs | DI4: speed 3; DI5: speed 4 | DI1: speed 2; DI4: speed 3; DI5: speed 4 |
| Fault acknowledgement | DI2 | DI2 |
| Several selections active | Selected values add | Selected values add |
Macro 3 is therefore not simply macro 1 with two extra selector contacts. DI1 changes purpose. Label the controls for the configuration actually in use.
Understand additive selection before testing
A preset number is an identifier, not its speed value. Also distinguish direct selection from a binary-coded preset selector. With the documented additive arrangement, selecting two contacts is not the same as selecting a third independent entry.
| Illustrative request | Selection | Result before limits |
|---|---|---|
| Preset 3 = 10; preset 4 = 15 | Only preset 3 | 10 |
| Same settings | Only preset 4 | 15 |
| Same settings | Both presets | 25 |
These numbers are an arithmetic example in the displayed parameter unit, not recommended machine settings. Check whether your project displays Hz or rpm. The permissible motor and machine speed, direction, ramps and drive limits must all agree with the application. A speed limit should not conceal an incorrect selection sequence.
For a PLC-controlled selector, review every output combination, including transitions between stages. If only one preset should be active, make that rule explicit in the PLC logic and test the transition scan as well as each steady state.
Commission in a controlled sequence
- Upload and retain the existing drive project. Record the active command data set and current terminal assignments before applying a macro.
- Isolate power before changing wiring; follow the drive discharge instructions. Keep the approved safety circuit intact. Verify digital-input common and signal polarity against the exact terminal diagram.
- Complete basic commissioning with the actual motor data. Select the supported preset through the commissioning workflow, then inspect the resulting connections. Applying a macro can replace prior assignments.
- Enter the preset values in their displayed units. Set application-approved speed limits and acceleration/deceleration times.
- With motion prevented through the approved procedure, monitor r0722 while operating each contact. Record which bit changes rather than relying only on wire labels.
- In a controlled test area, verify each permitted operating state at a low approved speed. Observe requested speed, actual speed and stop response.
- Save the confirmed configuration to nonvolatile memory and upload a dated backup. Repeat the approved power-restoration check before returning the machine to service.
Practical lab: prove the selector logic
Prepare a table with five columns: switch state, observed input bits, selected preset, expected combined request and measured result. For macro 1, test neither preset, preset 3 only, preset 4 only and both presets. Keep the run command separate in your records so that a zero request is not mistaken for a stop command.
For macro 3, include the DI0 start/preset relationship in every test. Selecting another preset without the required run path does not by itself prove the motor should start. Test any permitted combinations deliberately; do not discover them with a coupled production load.
The lab passes when the input record, computed request and observed operating state agree, and the documented stop procedure works in every permitted state. Attach the final parameter comparison to the commissioning record.
Troubleshoot unexpected speeds
| Symptom | Check first | Evidence to collect |
|---|---|---|
| Speed is higher than expected | Two preset selections active together | Input bits and selected preset values |
| Selector changes but request does not | Active command data set or setpoint routing | Online connections and parameter comparison |
| Correct request, no movement | Run permissives, drive state and active faults | Status and fault history |
| Correct speed only until power is removed | Nonvolatile save and startup configuration | Backup version and post-startup comparison |
Change one cause at a time. A useful handover explains why the configuration works, including allowed contact combinations, rather than listing only parameter numbers. Continue with analogue speed scaling when the process needs a continuously variable reference.
Frequently asked questions
Do macros 1 and 3 use binary speed selection?
The documented configurations use additive direct selections. Do not interpret several active inputs as a binary preset number unless you have deliberately configured that different function.
Does selecting a speed always start the drive?
No. Macro 1 has separate run commands. In the documented macro 3 mapping, DI0 combines ON/OFF1 with preset 1. Other permissives and the active control configuration still matter.
Can I copy these values to any G120?
Use the exact control-unit and firmware manual. Confirm available macros, input assignments, units and machine limits before applying a configuration.
Technical references
Use the document edition matching your installed hardware and firmware. The linked manuals establish the device-specific facts; the worked examples and check sheets are training exercises.