Lenze SCF Series Drives Modbus Communications - Manual (Page 13)

9 RG-SFMOD
Drive Setup & Operation
4. If the Watchdog Timer is enabled, keep it from timing out by ensuring that repeated reads of drive
status (Register #24 – 6 registers) are performed at reasonable intervals (typically less than 5 seconds
between reads because the Watchdog typically faults at 10 seconds).
5. Lock Control when drive operations are complete by writing a 2 to Register #1 (assert bit 1 of Register
#1).
6. Drive is now returned to TERMINAL mode (control from the drive’s terminal).
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 and TB1 asserted.
2. Unlock Controls and Parameters by writing the current programming password (default 225) to Register
#48.
3. Set parameter #5 (standard speed source) to 01 (keypad), and put drive in MANUAL mode so that it
responds to speed commands from the Keypad Speed Command register. This is done by sending
0200 hex to Register #1 (bit 9 asserted).
4. Control Drive Operation via various commands to Register #1 (Start, Stop, Reverse direction, etc.).
5. Control Drive Speed by writing the Speed Commands to Register #40 (Keypad Speed Command).
6. Change the programming parameters (e.g., change the acceleration rate by writing new acceleration
rate to register #69)
7. 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.
8. Lock Controls and Parameters when drive operations are complete by writing a 2 to Register #1 (assert
bit 1 of Register 1).
9. Drive is now returned to TERMINAL mode (control from the drive’s terminal).