Lenze MC Series Drives - Manual (Page 33)

29 RG-MCMOD
Drive Control & Communication
Unlocking the Drive:
1. The first write necessary to the drive to perform any function (start,change speed, change a parameter,
etc) needs to be an unlock command.
To control the drive over the network but not modify any of the drive's programming parameters, you
can write a value of 0 to the drive’s Modbus register 40049 (AC Tech register 48).
To both control the drive and alter any programming parameters then write the drive’s programming
password to Modbus register 40049. The default password for the MC1000/3000 series drive is 0019.
2. You should only need to send the unlock command once after power up. As long as the communications
do not timeout you should not need to write another unlock to the drive before writing any other
function.
NOTE: The drive’s control registers cannot be written to when the drive is in REMOTE control (i.e.
When Parameter 30 – CONTROL is set to REMOTE or when it is set to BOTH with no LOC SEL terminal
asserted).
Setting the Drive to Manual Mode:
In order for the drive to respond to speed commands written to the keypad speed register, Parameter 29
(MANUAL) must be set to KEYPAD and the drive must be put into manual mode. To do this write a value
of 200H to Modbus register 40002 (the drive’s control register). This step is not necessary if there are no
other speed references setup on any TB-13x terminal.
7.3 Basic Drive Commands
The following are the basic drive commands. ONLY ONE OF THESE CAN BE DONE AT A TIME:
1. To STOP the drive using the stop method programmed in Parameter 26 (STOP), write a value of 0004hex
to Modbus register 40002 (AC Tech register 1).
2. To Start the drive write a value of 0008hex to Modbus register 40002.
3. To Set Reverse direction write a value of 0040hex to Modbus register 40002. On MC1000 drives, this
command will not be accepted if Parameter 27 (ROTATION) is not set to REVERSE or FWD&REV.
4. To Set Forward direction write a value of 0080hex to Modbus register 40002. On MC1000 drives, this
command will not be accepted if Parameter 27 (ROTATION) is set to REVERSE.
5. If you want the network to control the speed of the drive, set Parameter 29 (MANUAL) to KEYPAD and
write the speed to the Keypad Speed Command Register, Modbus register 40041 (AC Tech register
40). Speed is written in 0.01Hz (so 4120 would be 41.20 Hz). In this mode the drive’s initial speed
reference on power up will be the last speed written to the drive.