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The HEINZMANN Digital Positioning System 2000, encompassing the StG 2040.xx-SV-PD and StG 2080.xx-SV-PD actuators, is designed for engine control applications in industrial environments. These electrical positioners feature a rotating output shaft and are actuated by an external electrical position setpoint signal, which can be a current, voltage, or PWM signal. They automatically regulate the mechanical position of their output shafts. For operation, the devices require connection to an external mains supply.
The core function of the system involves receiving a position setpoint for the actuator output shaft. This setpoint is compared with the actual value obtained from the actuator's feedback mechanism. A microcontrol unit then processes this signal for precise position control. The control circuit incorporates a 4-quadrant amplifier, enabling the actuator to be driven electrically in both directions. This design optimizes the actuator's rotational force and minimizes heat build-up during steady-state operation due to very low current consumption. The output shaft position signal, serving as feedback, is available as an analog current, voltage, or PWM signal, which can be used for further processing or indicating the actuator's position. The programmable microcontrol allows for extensive parameterization, enabling users to adapt various functions and capabilities, such as linear output characteristics, range, type, and sense of input and output, to specific requirements.
The positioners utilize a multi-polar magnetized permanent magnet mounted on the output shaft, with an armature containing working coils positioned opposite. Applying current to these coils generates torque in one direction, while reversing the current polarity generates torque in the opposite direction. Special materials and long-term lubricants ensure that the positioners are maintenance-free and have a long service life. The actuator output shaft is equipped with a feedback cam for contactless sensing, which accurately transmits the output shaft position to the control unit. The control unit itself is located on the back of the positioner, under a separate cover, opposite the output shaft journal. If the actuator is driven against a mechanical stop, current limitation will activate after approximately 20 seconds, reducing the current to a sufficiently low value to prevent damage.
4mA: stop
6V: stop
The positioners are designed for control applications on engines in industrial settings. For outdoor operation, additional protective measures against weather are necessary. Due to potential interference with electrical signals, users must provide additional safety devices tailored to the application. Any use deviating from the specified conditions, modifications to the device, or operation in extreme ambient conditions (dust, temperature, wetness), powerful electrical/electromagnetic fields, aggressive atmospheres/vapors, or potentially explosive areas must be coordinated with HEINZMANN, and a written opinion from the manufacturer should be obtained.
The length of the lever arm should be set to utilize approximately 90% of the governor output shaft adjustment angle. For governors with a 68° adjustment angle, the rack length L is calculated as L = 1.8a, where "a" is the travel distance of the injection pump or carburettor. The connecting linkage between the governor and the injection pump or carburettor should be length-adjustable and include an elastic link (pressure or tension), unless the actuator torque is less than 10 Nm. Joint rod heads conforming to DIN 648 are recommended. The linkage must operate smoothly and without clearance to ensure optimal control.
For diesel engines, the linkage is adjusted so that the injection pump is set to 0-2 fuel marks when the governor is in the stop position. The elastic link allows the control rack to reach the full load stop and for stopping via the emergency switch. For carburettor or gas engines, the linkage is adjusted so that the throttle valve is completely open at full load position. In idling speed position, the elastic link must be slightly overcome, allowing idle screw adjustment without altering governor adjustment. The direction of motion of the elastic link must be reversed if the carburettor or injection pump is on the left side of the governor.
Proper power supply connection is critical. An inappropriate choice of power supply, insufficient battery capacitance, incorrect wiring, or undersized cables can negatively impact performance, leading to increased current consumption, unnecessary vibration, overheating, and premature wear. The control unit must be connected via a fuse and a switch directly to the battery. If no battery is provided, a stabilized three-phase or single-phase power supply with at least 24 V DC and 10 Amps output power is necessary. Cable sizes and lengths specified in wiring diagrams must not be exceeded. During engine start or maximum current consumption, a voltage drop of no more than 2 Volts directly at the control unit is admissible. If battery chargers with a rapid charge mode are installed, this mode should not be used during operation.
The positioners are designed to be maintenance-free due to special materials and long-term lubricants. However, regular safety measures are crucial. Before any maintenance or repair work, the system must be switched off, isolated from the mains, and secured with a padlock. All parts must be cooled to ambient temperature. Loose connections should be re-fastened, and damaged lines/cables replaced immediately. Switch cabinets must remain closed, accessible only to authorized personnel. Water sprays or high-pressure cleaners should not be used on electrical equipment enclosures to prevent short circuits and corrosion.
General| Brand | Heinzmann |
|---|---|
| Model | 2000 |
| Category | Industrial Equipment |
| Language | English |
