DEIF Delomatic 3 AOM: Engineering Guide for Analog Output Modules

Introduction: The Key Role of Analog Output

In modern ship automation and power plant control systems, digital controller decisions ultimately need to be converted into continuous analog signals to drive various actuators - from the fuel rack position of the governor, the excitation current of the regulator, to the valve opening and frequency converter settings in process control. Although the analog output module is not as eye-catching as the main controller, it is a key link connecting the "decision layer" and the "execution layer". Its accuracy, isolation characteristics, and reliability directly determine the regulation quality and operational safety of the entire control system.

The DEIF Delomatic 3 Analog Output Module (AOM) is a specialized hardware module designed to meet this demanding requirement. As an important component of the Delomatic 3 series generator control system, AOM provides 8 flexible and high-precision analog output channels, with complete electrical isolation, fault safety characteristics, and classification society certification. It is widely used in ship electric propulsion, power station automation, and industrial power generation fields. This article will comprehensively analyze the technical architecture, configuration methods, performance indicators, and engineering applications of the AOM module based on the official technical data manual, providing practical technical references for system integrators and maintenance engineers.

Module overview and hardware architecture: powerful functions in compact design

Delomatic 3 AOM is a specialized module designed for rack mounted installation, and its hardware architecture fully reflects DEIF's profound understanding of marine and industrial application scenarios.

1. Channel organization and electrical isolation

The core configuration of the AOM module consists of 8 independent analog output channels, which are electrically divided into 2 Galvanically insulated groups, each containing 4 channels.

Within group common ground: Four channels within the same group share the same common terminal (Common), which means they have the same reference potential. In actual wiring, it is necessary to connect the loads of each channel in the group to the common terminal of the group uniformly.

Inter group isolation: Electrical isolation has been achieved between two groups, with a test voltage of up to 1.0kV (50Hz, 1 minute). This design is crucial as it allows the module to simultaneously drive actuators located in different potential domains (e.g. one set for driving grounded loads and another set for driving floating loads), effectively avoiding ground loop interference and improving the reliability of the system in complex electromagnetic environments. This isolation performance has been recognized by GL (German Lloyd's), LR (British Lloyd's), and DNV (Norwegian Classification Society).

2. Physical dimensions and environmental adaptability

Compact rack mounted design: With a module width of only 30.5mm (6TE) and a height that meets Delomatic 3 standard rack specifications, high-density analog output can be achieved in limited space, which is highly valuable for space valuable ship engine room control cabinets. The weight of the module is approximately 0.50 kg.

Power supply method: AOM is a passive module, and its working power is obtained from the system power module (PSM) through the backplane, without the need for external independent power supply, simplifying system wiring.

Power consumption: The typical power consumption is 5W, and the maximum power consumption does not exceed 9W. The heat generation is low, which is beneficial for the internal heat dissipation design of the cabinet.

Protection level: When the module is correctly installed in the Delomatic rack, the front panel protection level is IP20, which can prevent solid foreign objects with a diameter greater than 12.5mm from entering and meet the basic protection requirements for cabinet installation.

3. Terminal block and cable specifications

The module uses screw terminals for signal connection, suitable for wire cross-sections of 2.5 mm ² (applicable to single or multi strand flexible wires). This specification is sufficient to meet the current carrying and mechanical strength requirements for analog signal transmission in most industrial sites. When wiring, it is important to use appropriate wire connectors to ensure reliable connections and avoid loosening caused by vibration.

Output configuration and flexibility: One module meets multiple needs

The powerful flexibility of the AOM module is reflected in the fact that each channel can be independently configured through PCB board jumpers, without relying on software, ensuring configuration certainty and ease of maintenance.

1. Signal type and range configuration

Each output channel supports the following configuration combinations:

Optional options for configuration parameters, engineering application scenarios

Polarity: Unipole or Bi pole. Unipole (0-20mA/0-10V) is suitable for standard variable frequency drive speed settings and valve opening commands; Bipolar (-20~+20mA/-10~+10V) is suitable for actuators with bidirectional regulation, such as electro-hydraulic servo valves and reversible speed control systems

Signal Type Current output or Voltage output Current signal (4-20mA) has better anti-interference ability and long-distance transmission characteristics; Voltage signal (0-10V) suitable for high input impedance load devices

Important engineering details:

The jumper configuration is located on the PCB and needs to be set before module installation or in a power-off state. It is recommended to clarify the purpose of each channel during the design phase and keep configuration records to avoid repeated disassembly and assembly on site.

Support 'Live zero': signal ranges with starting values such as 4-20mA or 2-10V. This function is implemented through the application software of the CM module, rather than hardware jumpers, so it can be flexibly adjusted during system operation without the need to modify hardware.

2. Fault safety features

Output short circuit protection: When the channel is configured in voltage output mode, the output can withstand continuous short circuits without damage. This feature is particularly valuable in case of on-site wiring or load faults, greatly reducing the risk of module damage caused by accidental short circuits.

Output behavior during system failure: In the event of a power supply or system failure, all analog output channels will automatically reset to zero (0V/0mA), regardless of whether the channel is configured as unipolar or bipolar. This design ensures that in the event of a controller crash or power outage, the actuator can return to a safe position (such as zeroing the governor or closing the valve), reflecting the design concept of "fail safe", which is crucial for the safety of the ship's main propulsion system.

3. Load capacity

Current output mode: The maximum load resistance is 500 Ω. This means that at a 20mA output, the output voltage can reach 10V, which is sufficient to drive most current input devices in industrial sites.

Voltage output mode: The minimum load resistance is 500 Ω. When designing, it is necessary to ensure that the impedance of the connected load is not lower than this value to ensure the accuracy and driving capability of the output voltage.

Accuracy, Resolution, and Environmental Performance: The Foundation of Reliable Control

The accuracy index of the analog output module directly determines the accuracy of system regulation. The AOM module has achieved Class 1 level in these aspects and performed excellently.

1. Accuracy and temperature characteristics

Accuracy level: According to the IEC 688 standard, the accuracy of the AOM module is Class 1, which means that the comprehensive error (including linearity, repeatability, hysteresis, etc.) does not exceed ± 1% of the full scale at the reference temperature (+15 ° C~+30 ° C). This level of accuracy fully meets the engineering requirements of core control circuits such as speed regulation and voltage regulation for generator sets.

Temperature coefficient: The maximum temperature drift is 0.2%/10 ° C. This means that when the ambient temperature changes within the rated operating range (-10 ° C~+55 ° C), the output error increases by up to 0.2% for every 10 ° C increase. For environments with significant temperature fluctuations such as the cabin, this indicator ensures the module's usable accuracy across the entire temperature range.

2. Resolution

Bipolar mode: resolution of 0.4% of range. For example, at a range of ± 10V, the minimum distinguishable voltage change is approximately 80mV.

Unipolar mode: resolution of 0.2% of range. At a range of 0-20mA, the minimum distinguishable current change is approximately 40 µ A.

Output Ripple: The maximum peak to peak ripple does not exceed 1%, ensuring the smoothness of the output signal and avoiding actuator oscillation caused by signal jitter.

3. Environmental conditions and certification

Temperature range:

Reference temperature:+15 ° C~+30 ° C

Rated temperature: -10 ° C~+55 ° C

Operating temperature: -25 ° C~+70 ° C

Storage temperature: -40 ° C~+70 ° C

Climate rating: HSE rating in accordance with DIN 40040 standard, suitable for marine environments with high humidity and condensation risk.

Flame retardant rating: All plastic components meet the UL94-V0 self extinguishing rating, meeting the fire safety requirements of ships and industrial sites.

Classification Society Certification: The Delomatic 3 system has obtained comprehensive certification, including the CE mark and type approvals from LR (Lloyd's Register), GL (Germanischer Lloyd), DNV (Det Norske Veritas), ABS (American Bureau of Shipping), BV (French Classification Society), RINA (Italian Classification Society), and CNK. This means that the AOM module can be directly deployed on classified ships and offshore platforms without the need for additional equipment certification.

Engineering application and installation maintenance suggestions

1. Typical application scenarios

Generator set governor control: Connect the 4-20mA output of AOM to the fuel rack position setpoint of the electronic governor to achieve precise closed-loop control of engine speed.

Generator Voltage Regulator (AVR) Control: The excitation set value input of the AVR is driven by voltage output (0-10V) or current output, combined with the voltage regulation function of Delomatic 3, to achieve automatic adjustment of reactive power and power factor.

Power Management System (PMS): In a multi machine parallel system, load distribution instructions (power or reactive setting values) are sent to each unit controller through AOM to achieve balanced distribution of active and reactive power.

Process control valve positioning: In auxiliary systems such as fuel viscosity control and cooling water temperature regulation, AOM can directly drive 4-20mA electric pneumatic positioners or electric actuators.

2. Installation and configuration precautions

Jumper setting: Before installing the module, it is necessary to configure the signal type and polarity of each channel using PCB board jumpers according to the design drawings. If changes are required, the module power must be cut off.

Cable selection and shielding: Analog signals are sensitive to interference, and it is recommended to use twisted pair shielded cables. The shielding layer should be grounded at a single point at the receiving end (actuator side) or treated according to the system grounding specifications. The wiring terminals of AOM support a wire diameter of 2.5mm ², which is sufficient to accommodate standard instrument cables with shielding layers.

Handling of common terminals within a group: The common terminals within the same group (4 channels) are already connected within the module. When wiring externally, it is important to note that the common circuits of all loads within the group must be connected to the common terminal of that group. It is not allowed to mix the common terminals of different groups, otherwise it will damage electrical isolation.

Load matching verification: Before debugging, use a multimeter to measure the resistance of the load connected to each channel, ensuring that the load is ≤ 500 Ω in current output mode and ≥ 500 Ω in voltage output mode, to avoid output distortion or module overload caused by load mismatch.

3. Common problems in troubleshooting

Output always at 0: Check if the system power supply is normal, if the AOM module is securely inserted into the rack, and if there are bent pins on the backplane connector.

Excessive or fluctuating output deviation: Check if the system grounding is good and if the cable shielding is reliable; Verify whether the load resistance is within the allowable range; Check if the configuration jumper is consistent with the software settings (such as software configured for unipolar but hardware jumper for bipolar).

A certain channel has no output: first check if the jumper of that channel is missing or has poor contact, and then check if the external wiring is open. If the problem persists, you can try moving the load of this channel to other normal channels in the same group for cross testing to determine whether it is a module hardware failure or an external load failure.