SIEMENS
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Siemens D 31 · 2015
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Overview
Highlights
Firmware functionality
Further classification refers to the control variables:
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Current control
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Speed control
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Torque control
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Position control
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Technological process control (pressure, flow rate,
temperature, fill level, etc.)
Availability
Availability refers to the frequency ratio, namely how often or
seldom a single device restricts the entire production process
due to a problem. That is why it is important in terms of availabil-
ity that a drive enters the faulty state only when it is essential for
self-protection. Moreover, it is important that the cause of the
pending problem is identified and eliminated as quickly as
possible.
Features and measures to increase availability:
•
Parallel connections, for example, to maintain emergency
operation (possibly also at a lower rating), if a power unit fails
•
Automatic restart
•
Flying restart
• V
dc
control with kinetic buffering
•
Redundancy (hardware, communication, etc.)
Setpoints and commands
The setpoint channel is the link between the setpoint source and
the motor control. The inverter has a special feature that sup-
ports simultaneous input of two setpoints. Generation and sub-
sequent modification of the total setpoint (influencing the direc-
tion, skip frequency, up/down ramp) take place in the setpoint
channel.
Different sources of command usually result from the require-
ments to operate a drive from different places (on-site/remote),
in different situations (standard/emergency mode) and/or differ-
ent operating. The BICO technology allows SINAMICS to config-
ure and combine the sources of command and setpoint sources
entirely individually.
The following can be used for switching:
•
Dataset switchover
•
Switching elements among the Free Function Blocks (FFB)
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Fixed values
Limiters and monitoring functions
Limiters or limits are used to constrain input and/or output vari-
ables as appropriate to the connected machine; this means that
not all positioning variables are used over their full range but are
limited judiciously to enhance the safety and quality of the
production process.
Timers/runtime counters are used to obtain information or make
statements about the temporal course of a process.
•
Recording application information for manufacturers
•
Recording operating times for users
•
Configurable timer for monitoring intervals
•
Configurable timers for triggering activities at certain intervals
(e.g. maintenance work)
Monitoring is used for early detection of conditions that may be
detrimental or even dangerous to the connected machine, so
that they can be counteracted expediently. If an appropriate
countermeasure is not initiated, a protective response of the
inverter with probable fault shutdown will ultimately result.
Diagnosis
The "Diagnosis" subgroup comprises all those functions that
provide assistance with determining the possible causes of a
problem.
If problems occur in a process, or in the driven machine, further
interpretation of the measured variables in the inverter is re-
quired. To this end, different signals should be correlated with
respect to time and then observed.
This includes:
•
Error and alarm buffer
•
Diagnostic buffer
•
List of missing signals that interrupt operation
•
Tracing for temporal assignment of signal profiles
•
I/O simulation
•
Telegram content diagnoses
•
Terminal status
Protection
All protection functions counteract any possible damage to the
inverter and/or motor. This is why the shutdown thresholds
cannot be parameterized but are factory-tuned and permanently
set to match the built-in components. Alarm thresholds may be
parameterized as a relative variable for shutdown threshold of
some monitoring processes. Thus, a countermeasure that is
sensitive to the process may still be initiated upon occurrence of
the alarm.
Apart from protection of the hardware, protection of the parame-
terization and therefore protection of the intellectual expertise of
the customer from unauthorized access and copying is also an
important part of the protection functions.
•
Write protection
•
Know-how protection
•
Copy protection
Common Engineering Functions
All functions of the inverters are implemented to enable a
common engineering approach to their handling no matter
which type of drive is selected; i.e. if a function is used in drive
x, it can be configured intuitively and commissioned in the same
way in drive y. Knowledge gained can therefore be reused easily
and efficiently. The configuration and commissioning tools in
particular (such as SIZER for Siemens Drives, STARTER and
SINAMICS Startdrive) reflect this approach.
For further details, see the Section "Engineering tools".
Special Application & Branch Functions
Siemens has applied these technology functions (standard and/
or advanced) to generate numerous application solutions.
These applications can be downloaded from the Siemens
Application Support website at
/sinamics-applications
The STARTER commissioning tool can then be used to activate
and configure the applications and download them to the
Control Units.
© Siemens AG 2014