General Information
AX2000-B750 Configuration
Configure the address, baud rate and optical power on the drive to operate properly with the SERCOS master. These values can be adjusted through a terminal emulator program such as Microsoft Windows® HyperTerminal (Start | Run ... type hypertrm.exe) by the use of the following commands.
- Change the desired parameters by using the commands ADDR, SBAUD and SLEN, as explained below.
- Type save to save the new values.
- Type coldstart to reset the amplifier.
Changing the Drive Address
In the terminal program, use the command ADDR #, where '#' is the new drive address. The SERCOS address can also be changed via key operation on the front panel of the AX2000-B750. (Please refer to the “Digital Servo Amplifier AX2000” manual, e.g. available from www.beckhoff.com). The drive address can be set between 0 and 63. An address of zero designates the drive as a repeater on the SERCOS ring.
Changing the Baud Rate and Optical Power
In the terminal program, change the SERCOS baud rate by using the command "SBAUD 2" for a baud rate of 2 MBaud or "SBAUD 4" for a baud rate of 4 MBaud. The default is 4 MBaud. Change the optical power by using the command SLEN #, where # is the length of plastic optical cable, in meters, from 1 to 45 meters. The default is 5 meters. This parameter can be used to set the optical range (in meters) for a standardized 1mm² plastic optical fiber cable (e.g. BECKHOFF part number"Z1101") Also new is the command SLEN0 for very short lengths.
SLEN |
|
|---|---|
0 | very short connection |
1…< 15 | Length of the connection of a 1mm plastic cable (e.g. BECKHOFF Z1101) |
15…<30 | " |
>= 30 | " |
The baud rate and the optical power can also be changed via the so-called Drive software. Please refer to the user’s manual “Inbetriebnahme-Software SR600 für AX2000".
If the optical power is not adjusted properly, there will be errors in the telegram transmission, and the red error LED on the drive will light. In normal communication, the green transmit and receive LEDs will blink rapidly, causing the LEDs to appear faintly lit.
MDT CONTROL BITS 13 - 15
The following table gives a detailed description of the operation of the drive in regard to bits 13, 14 and 15 of the MDT Control Word. Please note that the three bits are ordered in the table according to priority.
Enable Drive | Drive On/Off | Halt/Restart | Description |
|---|---|---|---|
14 | 15 | 13 | |
0 | x | x | When the “Enable Drive” bit changes from 1 to 0, the power stage is disabled and the motor coasts to a stop. |
1 | 0 | x | When the “Drive On/Off” bit changes from 1 to 0, the drive decelerates at the quick deceleration rate (P-0-3022). The power stage is disabled when the internal velocity command is zero and the velocity feedback is below 5 RPM. |
1 | 1 | 0 | When the “Enable Drive” bit and the “Drive On/Off” bits are set, the power stage is enabled. When the “Halt/Restart” bit changes from 1 to 0, the drive decelerates at the acceleration limit value defined by S-0-0137 or S-0-0042. |
1 | 1 | 1 | When the “Halt/Restart” bit changes from 0 to 1, the drive follows the master’s command values. In velocity mode, accelerations are limited by IDN 136 or IDN 137, and the velocity command is limited by S-0-0038, S-0-0039 or S-0-0091. In position mode, the drive monitors the position command and sets a fault if successive position commands exceed the velocity limit (S-0-0038, S-0-0039 or S-0-0091). In position mode, it is the master’s responsibility to limit successive position commands in order to maintain the desired acceleration and velocity limits. |