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Setpoint Handling - Siemens SIMOVERT MASTERDRIVES Operating Instructions Manual

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Communication via CC-Link
4.4

Setpoint handling

Regulation of
frequency or torque
Handling setpoints
4-6
With SIMOVERT MASTERDRIVES converters there are several
possibilities to control a drive. In systems with CC-Link the drive can be
controlled by frequency setpoints or torque setpoints.
In the following sections there is the description how to handle the CBL
for controlling the drive with frequency setpoints. It is also valid for
torque control. Different handling is specially noted.
For more information about the possibilities of controlling and regulating
refer to converter documentation.
Giving setpoints from the PLC is possible in two ways:
♦ Working with fixed setpoints selected by control bits RL, RM and
RH. The fixed setpoints are stored in the fixed setpoint buffer of the
converter. They can parameterized from the panel of the converter
(PMU) or from PLC via CC-Link.
♦ Working with variable setpoints. They will be set with the frequency
set command .
In the converter you can select (softwiring) one of the different sources
by the parameter P443 Source main setpoint. Refer to documentation
of converter; function diagram 316.
At regulation of torque use P486; refer to documentation of converter;
function diagram 320.
Example:
1) working with fixed setpoints RL, RM, RH:
=> P443 = 0040
2) working with variable setpoints by frequency set command:
=> P443 = 3002
The different data formats for handling setpoints will be discribed in
chapter 4.9, "Data formats and data conversion".
The drive is started by activating control bit STF (RYn0: forward) or
STR (RYn1: reverse).
Set frequency value from fixed setpoint
buffer.
Set frequency value from first CBL to
Source main setpoint.
6SE7087-6NX84-0GB0
Operating Instructions
03.99
Siemens AG
SIMOVERT MASTERDRIVES

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