Skip to Content
Skip over Language Selection
Skip over Primary Navigation
Skip over secondary navigation
Publishers Area
Skip over Contact, Sitemap
Skip over Search
[Advanced]
http://www2.sea.siemens.com | Set 23 | 2007-12-12
print
LOGO! Power (24 V/1.3 A), primary switched-mode power supply
For supplying power to logic and sensor components
LOGO! (12/24 RC), logic module
Recording, evaluation and processing of sensor signals, PI control, plain-text display of messages
LOGO! (AM2 AQ), expansion module
Analog output module for controlling the drive
SIRIUS monitoring relay
Monitoring of levels with 3-pole probe, hysteresis, variable resistance
SINAMICS G110, frequency inverter
Variable speed control of the asynchronous motor
Low-voltage asynchronous motor
Driving the pump
SITRANS P pressure transmitter
Recording the current pressure
SIRIUS probe for level monitoring
3-pole probe for level monitoring
Automation task:
In an injection mold facility, the produced castings are cooled down to a certain end temperature by water cooling. Several consumers are simultaneously connected for cooling down the maximum of three castings.
For optimizing the cooling capacity and for reducing failures, it should be ensured that a constant pressure is always available for the central supply, independent of the number of active consumers. The adjustment of the pump conveying current, and thus the pressure is to be adjusted continuously.
It is to be ensured that the pump is only operated with sufficient supply of cooling water. The current pressure (actual value) as well as the pump operating hours are to be shown in a display. The required pressure of the consumers (setpoint value) must be editable.
Automation solution:
The Automation solution uses a LOGO! logic module with a connected SITRANS P pressure measuring transducer for recording the current pressure in cooling water circulation.
A PI controller in the LOGO! logic module regulates the pressure by varying the motor speed depending on the currently measured pressure. As a consequence, the pressure of the cooling water facility is maintained at a consistent level, independent of the number of consumers. The cooling capacity is optimized, and failures are prevented by the too low pressure.
The asynchronous motor is connected to a SINAMICS G110 frequency converter getting the setpoint speed as frequency setpoint value via the analog output of the LOGO! expansion module AM2 AQ. The speed of the asynchronous motor is adjusted continuously via the SINAMICS G110.
A SIRIUS wire electrode for monitoring the level is connected to a SIRIUS monitoring relay. This monitors whether the pump is supplied with liquid during its operation. The monitoring status of the SIRIUS monitoring module is passed on at a digital input of the LOGO! logic module.
The current pressure of the cooling water facility, the setpoint pressure and operating hours of the pump can be directly displayed on the integrated display of the LOGO! logic module. The setpoint pressure of the cooling water facility can be additionally edited.
Startup Code
For the startup we offer you software examples with test code and test parameters as download. The software examples support you during the first steps and tests with your Micro Application Sets. They enable quick testing of hardware and software interfaces between the products described in the Micro Application Sets.
MAS23 Excel OPC Document
MAS23 LOGO Startup Code
MAS23 PC Access Startup Code
MAS23 S7200 Startup Code
MAS23 Technical Manual
Applications
This Micro Automation Set is particularly suitable for low-cost and user-friendly control of motor speeds, making it ideal for the following applications:
Water/waste water systems
Filling systems
Building systems: pump control
Machine control: vacuum systems, mixing machines