Description
DEIF SCM4.1 | Delomatic 4 AC Measuring Module | Generator Protection
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | DEIF A/S |
| Module | SCM 4.1 |
| System | Delomatic 4 / DM-4 |
| Hardware Numbers | 2044230022A / 2044230020D |
| Product Type | AC measuring / protection module |
| Supply | From PCM module through backplane |
| Typical Power Consumption | 2 W |
| Maximum Power Consumption | 3 W |
| Voltage Measurement | 100–690 V AC |
| Voltage Range | Up to 690 Vrms direct |
| Current Input | 1 A or 5 A from current transformer |
| Frequency Range | 40–70 Hz |
| Measurement Accuracy | Class 0.5 |
| Generator Voltage Measurement | 3-phase voltage + neutral |
| Generator Current Measurement | 3-phase |
| Busbar/Mains Voltage | 3-phase voltage + neutral |
| Measurement Method | True RMS |
| Module Width | 30.5 mm / 6 TE |
| Protection Rating | IP20 |
| Nominal Operating Temperature | -10 to +55°C |
| Operational Temperature | -25 to +70°C |
| Storage Temperature | -40 to +70°C |
DEIF documentation describes SCM 4.1 as the AC measuring module of the Delomatic system, with fast AC protection functions. It measures generator and mains/busbar electrical quantities, while the measured values are transferred to the PCM 4.3 control module through the backplane.
Product Introduction
The DEIF SCM4.1 is an AC measurement and protection module used in Delomatic 4 generator control systems. It acquires three-phase generator voltage and current together with mains or busbar voltage, then calculates electrical parameters such as active power, reactive power, apparent power, power factor, frequency, and phase angle. The module also provides fast protection functions used by the generator-control system.
For maintenance engineers, the important distinction is that SCM4.1 is not simply an analog measurement card. Its measurements are integrated into synchronization and generator protection functions. DEIF specifies Class 0.5 measurement accuracy, direct voltage measurement up to 690 V AC, and 1 A/5 A CT inputs, making correct transformer ratios and wiring configuration critical during replacement.
SCM4.1
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
A failed SCM4.1 can affect more than displayed electrical measurements. Because the module participates in fast AC protection and synchronization-related functions, an incorrect replacement or incorrect CT/VT configuration can create serious commissioning problems.
Typical Applications
- DEIF Delomatic 4 generator control systems
- Diesel and gas generator synchronization
- Marine generator control and power-management systems
- Hydro generator control applications
- Generator-to-mains or generator-to-busbar measurement
- Electrical protection and synchronization functions
DEIF’s DM-4 documentation specifically identifies SCM 4.1 as the AC measurement module and provides separate measurement configurations for systems using one or two SCM modules.
Technical Pitfalls to Avoid
- Verify CT secondary rating.
SCM4.1 accepts either 1 A or 5 A CT secondary signals. The CT ratio and secondary rating must match the configured installation; never connect a CT circuit based only on physical connector compatibility. - Verify the voltage measurement arrangement.
The module supports generator and mains/busbar three-phase voltage measurement. DEIF documentation specifies direct measurement up to 690 V AC, while lower-voltage measurement can use voltage transformers. - Copy the I/O address and jumper configuration.
DEIF’s replacement instructions state that SCM 4.1 uses a rotary switch for the backplane I/O address and that SCM 4.1/SCM 4.2 modules must have unique addresses from zero through three. The replacement instructions also specify the required jumper condition. - Do not treat two SCM modules as automatically interchangeable.
With one SCM4.1, the system can measure generator voltage/current and mains voltage. With two SCM modules, the architecture can also provide expanded mains/busbar electrical measurements. The number and location of SCM modules therefore affect the application configuration.
Related Products
- DEIF PCM 4.3 — Main control, power-supply, and data-exchange module that communicates with .1 through the backplane.
- DEIF PCM 4.4 — Related Delomatic control-system module; verify the exact DM-4 system generation before substitution.
- DEIF IOM 4.2 — Multifunction interface module for digital and sensor signals in the Delomatic 4 architecture.
- DEIF SCM 4.2 — Related SCM generation used for AC measurement and protection; not automatically interchangeable with .1.
- DEIF DM-4 — Delomatic 4 control-system platform in which .1 is used.
- DEIF GPU — Generator protection/control equipment family used in generator applications; functional scope differs from the SCM measurement module.
- DEIF PPU — Power-management controller family used in generator and power-plant applications.
Procurement & Replacement Check
Before purchasing a , verify:
- Exact designation: SCM 4.1
- Hardware number: 2044230022A / 2044230020D, if applicable
- Delomatic system generation
- Number of SCM modules installed
- Original I/O address
- Jumper configuration
- 1 A or 5 A CT configuration
- Generator VT/PT arrangement
- Mains/busbar measurement arrangement
- PCM module and backplane compatibility
- Existing protection and synchronization configuration
- Condition of terminal connectors
- Whether the replacement has been functionally tested
Recommended procurement description:
DEIF .1 Synchronizing/AC Measuring Module, Delomatic 4 DM-4, 3-Phase Generator and Mains Measurement, 100–690 V AC, 1 A/5 A CT Input, Class 0.5, Fast AC Protection Module, P/N 2044230022A / 2044230020D.
The key identification is DEIF .1 = Delomatic 4 AC measuring and fast-protection module. For field replacement, the CT/VT arrangement, backplane address, jumper configuration, and one-versus-two-SCM system architecture deserve as much attention as the module part number itself.
