SIEMENS
SINAMICS G150 NEMA
Engineering information
4
Siemens D11.7
(Part 1) – 2013
Control interfaces, Firmware functions
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Control interfaces
Both a PROFIBUS interface on the CU320-2 DP control unit
and a terminal module are provided as standard for use as
the control interface.
The terminal module permits connection to the higher level
control using analog and digital signals. Optionally the
analog and digital inputs and outputs can be expanded by
a second terminal module. Additional digital I/O on the
CU320-2 control unit may be utilized too.
To simplify configuration and commissioning of the drive, the
inputs and outputs are preset to factory default settings.
Open loop control and regulator functions
The drive regulator contains a high-quality sensorless vector
control with speed and current control as well as motor and
drive protection.
Software and protection functions
A selection of standard software functions is described
below:
Firmware functions
Setpoint input
The setpoint can be defined internally or externally, internally as a fixed, motorized potentiometer or jog setpoint,
externally via the PROFIBUS interface or an analog input of the terminal module. The internal fixed setpoints and the
motorized potentiometer setpoint can be switched over or adjusted using control commands via all interfaces.
Motor identification
Automatic motor identification permits fast and simple commissioning and optimization of the drive control.
Ramp function generator
A user friendly ramp function generator with separately adjustable ramp up and ramp down times, together with
variable smoothing times in the lower and upper speed ranges, improve the control response and therefore
prevent mechanical overloading of the drive train. The ramp down characteristics for emergency stop can be
parameterized separately.
Vdc max controller
The Vdc max (DC bus) controller automatically prevents overvoltages in the DC link if, for example, the ramp-down
time is set too short. This is achieved by automatically extending the ramp-down time.
Kinetic buffering
During line supply failure, this functions draws power from the motor to keep the drive powered up, to the extent
permitted by the kinetic energy of the drive train. The speed drops depending on the moment of inertia and torque of
the load. The drive maintains control of the motor and reaccelerates it to the current speed setpoint when the power
supply returns.
Automatic restart
1)
The automatic restart function switches the drive on again when the power is restored after a power failure, and
ramps the motor back up to the speed setpoint.
Flying restart
1)
The flying restart function provides bumpless connection of the drive on to a rotating motor.
Technology controller
A PID controller is provided for technology control functions such as level, pressure or flow control. The P, I, and D
components can be set separately. An “extended pump functions” macro offers pump specific functions including
Energy Saving (hibernate),
Enhanced Energy Saving,
Maintenance Cleaning and Wall Deposits Prevention.
Free function blocks
The freely programmable function blocks make it easy to implement logic and arithmetic functions for controlling the
drive. The blocks can be programmed using either the operator panel or the STARTER commissioning tool.
Drive Control Chart
Drive Control Chart (DCC) is an additional tool for the easy configuration of sophisticated process-oriented functions.
(DCC)
The block library contains a large selection of control, arithmetic and logic blocks as well as extensive open-loop and
closed-loop control functions. The user-friendly DCC editor enables easy graphical configuration and a clear
representation of control loop structures. DCC is an add-on to the STARTER commissioning tool.
Motor protection
I
2
t detection for
The motor temperature is calculated in a motor model in the drive software, taking into account the current speed
motor protection
and load. More exact sensing of the temperature, also taking into account the influence of the ambient temperature,
is possible by means of direct temperature monitoring using KTY84 sensors in the motor winding.
Evaluation of motor
Motor protection by evaluating a KTY84 or PTC temperature sensor. When a KTY84 sensor is connected, the limit
temperature
values can be set for temperature alarm or trip. With a PTC thermistor, the reaction following triggering (alarm or trip)
can be defined.
Motor stall protection
A stalled motor (locked rotor) is recognized and the motor is protected against thermal overloading by shutting down.
Power section protection
Ground fault monitoring
In grounded neutral systems a ground fault on the output side is detected by summation of phase currents, and
on the output side
results in shutdown.
Electronic short-circuit
A short-circuit between motor and drive (on the drive output terminals, in the motor cable, in the motor terminal box)
protection on the
is detected and interrupted.
output side
Thermal overload
The temperature of the power section is monitored via a thermal model calculation that includes monitoring of heat
protection
sink temperature. An alarm is given when the first overtemperature threshold is reached. If the temperature rises
further, either a trip is initiated or the pulse frequency or output current are automatically adjusted to reduce the
thermal load until the problem is eliminated (for example, replacing blocked filter mats).
1)
Factory setting: not activated (can be programmed).