Lenze MCH Series Drives Modbus Communications - Manual (Page 14)

RG-MHMOD 10
Drive Control & Communication
4.9 Start/Stop, Speed Control and Parameter Change Operation
The typical sequence for a Start/Stop, Speed Control or Parameter Change operation is listed herein.
1. Power up drive with serial enabled.
2. Unlock Controls and Parameters by writing the current programming password (default 19) to Register
#48.
3. Control Drive Operation via various commands to Register #1 (Start, Stop, etc.).
4. Control Drive Speed by writing the Speed Commands to Register #40 (Keypad Speed Command) or
by setting the SERIAL SELECT bit (writing 200H to Register #1) and then writing speed commands to
Register #42 (Serial Speed Command).
5. Change the programming parameters (e.g., change the acceleration rate by writing new acceleration
rate to register #59)
6. If the Watchdog Timer is enabled, keep it from timing out by insuring that repeated reads of any of the
registers are performed at reasonable intervals (typically less than 5 seconds between reads because
the Watchdog typically faults at 10 seconds). Note: It is suggested that the drive status register (#24)
be used for this function.
7. Lock Controls and Parameters when drive operations are complete by writing a 2 to Register #1 (assert
bit 1 of Register 1).
8. Drive is now returned to AUTO mode (control from the drive’s keypad).