1. Product Overview

2. Key Features

• 3-Phase Precision Measurement: Class 0.5 accuracy for voltage (0–690 VAC direct) and current (via CTs)DEIF.

• Integrated Synchronisation: Automatic synchronisation (frequency, phase, voltage matching) for generator-grid and generator-generator paralleling.

• Configurable Protection: Vector jump (Δφ), over/underfrequency, over/undervoltage, and reverse power protectionDEIF.

• Dual Voltage Inputs: 2× direct 3-phase voltage (L1/L2/L3/N) inputs (40–70 Hz, max 690 VAC)DEIF.

• Galvanic Isolation: 2.2 kV isolation (relay outputs ↔ all other potentials); 550 V isolation (digital inputs ↔ others)DEIF.

• Communication Interfaces: CAN (125–1000 kBd), RS485 (Modbus RTU), and backplane bus for DM-4 rack integrationDEIF.

• Hardware Configuration: Rotary switch (I/O address, 0–3); jumpers for function selection (X10/X13/X20).

• Certifications: CE, IEC 61010-1 (Overvoltage Cat III, 690 VAC), IEC 60688 (accuracy), marine compliance (DNV/GL, ABS)DEIF.

• Rack Mount: 6TE (30.48 mm) width, fits 42TE/60TE DM-4 racksDEIF.

3. Technical Specifications

3.1 Electrical Ratings

3.2 Environmental & Mechanical

4. Application Scope

• Generator Synchronisation: Automatic paralleling of diesel/gas/steam generators to grid or bus tie (marine/industrial).

• Power Management: Load sharing, frequency/voltage control, and reverse power protection for islanded systems.

• Grid Monitoring: 3-phase grid voltage/current measurement and protection (vector jump, frequency/voltage anomalies)DEIF.

• Marine Switchboards: Shipboard power distribution (IEC 60945 certified) and generator control panelsDEIF.

• Industrial Plants: Combined heat and power (CHP) systems, backup generator paralleling, and mains failure (AMF) control.

• DM-4 System Integration: Core I/O module for Delomatic 4 (DM-4) hydro/gas/land controller racksDEIF.

5. Installation & Wiring

5.1 Installation Requirements

1. Rack Mounting: Insert SCM4-1 into a 6TE slot in a DM-4 42TE/60TE rack (horizontal only); secure with front panel screws.

2. Slot Clearance: Maintain ≥25 mm vertical clearance for ventilation; avoid blocking rack fans.

3. ESD Protection: Use anti-static wristband and grounded ESD mat when handling (static-sensitive PCB).

4. Cable Separation: Separate high-voltage (690 VAC) measurement cables from low-voltage (24 VDC) control/communication cables by ≥10 cm.

5.2 Hardware Configuration (Before Power-On)

1. I/O Address Setting: Rotate the front-panel rotary switch to set a unique address (0–3); all SCM4.1/SCM4.2 modules must have distinct addresses.

2. Jumper Settings (X10/X13/X20): Set all jumpers to OFF (default for standard synchronisation/measurement mode).

3. CT Ratio Configuration: Set internal jumpers to match current transformer secondary (5 A or 1 A).

5.3 Terminal Wiring (Simplified)

• Voltage Inputs: Use shielded cable for 690 VAC inputs; ground shield at SCM4-1 end only.

• CT Wiring: Short unused CT terminals; avoid open-circuit CTs (hazardous high voltage).

• Terminal Torque: Tighten terminals to 0.8–1.0 Nm to prevent loose connections and overheating.

• Fusing: Protect 24 VDC supply with 3 A slow-blow fuse; voltage/CT inputs require no external fusing.

6. Front Panel & Operation

6.1 Front Panel Layout

• LED Indicators (Left to Right)

  • PWR: On = 24 VDC auxiliary supply OK.

  • RUN: Flashing = Module operational (1 Hz); Solid = Fault.

  • SYNC: On = Synchronisation active; Flashing = Synchronisation in progress.

  • ALARM: On = Fault detected (vector jump, frequency/voltage error).

  • CAN: Flashing = CAN bus communication active.

  • RS485: Flashing = Modbus RTU communication active.

• Rotary Switch: I/O address (0–3) for DM-4 backplane bus.

• Jumpers: X10/X13/X20 (function selection, default OFF).

6.2 Startup & Configuration

1. Physical Installation: Mount SCM4-1 in DM-4 rack; wire voltage/current inputs, auxiliary supply, I/O, and communication cables.

2. Hardware Setup: Set rotary switch to unique address (0–3); set X10/X13/X20 jumpers to OFF.

3. Power On: Apply 24 VDC auxiliary supply; PWR LED solid green; RUN LED flashes (1 Hz).

4. Software Configuration (via DM-4 Controller/PC Tool)

   • Set system nominal frequency (50 Hz / 60 Hz).

   • Set CT ratio (e.g., 2000/5 A) and VT ratio (if used).

   • Configure synchronisation parameters (Δf: ±0.2 Hz; Δφ: ±5°; ΔU: ±5% Un).

   • Enable protection functions (vector jump: 15°; U/F: 47.5 Hz; O/F: 52.5 Hz; U<: 360 V; U>: 440 V for 400 V system).

5. Communication Setup: Configure CAN baud rate (500 kBd) and Modbus address (1–247).

6.3 Normal Operation

• PWR: Solid green; RUN: Flashing green (1 Hz).

• SYNC: Off (no synchronisation) or solid green (synchronised).

• ALARM: Off; CAN/RS485: Flashing green (communication active).

• Relays: De-energised (NO open, NC closed).

6.4 Synchronisation Process

1. Detection: SCM4-1 measures generator and grid voltage/frequency/phase.

2. Matching: Controller adjusts generator speed (Δf → 0) and voltage (ΔU → 0); phase angle (Δφ) reduces to 0°.

3. Closure: When Δf < ±0.2 Hz, Δφ < ±5°, ΔU < ±5% Un for 1 second, SYNC LED solid green; closure relay energises to close generator breaker.

6.5 Fault Operation (Vector Jump)

• ALARM: Solid red; RUN: Solid red.

• Fault Trigger: Sudden phase shift >15° (adjustable) between generator and grid.

• Action: Trip relay energises; opens generator breaker to prevent out-of-phase paralleling.

• Reset: Clear fault via DM-4 controller; reset automatically when phase stabilises.

7. Safety Precautions

• High Voltage Hazard: Only qualified electrical personnel may install/service. Disconnect all power sources (24 VDC + 690 VAC inputs) before wiring.

• CT Hazard: Never open-circuit current transformer terminals (induces hazardous high voltage).

• ESD Sensitivity: Static electricity can damage internal PCB. Use anti-static wristband and grounded ESD mat.

• Relay Load Ratings: Do not exceed 250 VAC/8 A per output; inductive loads require external surge suppression.

• No Unauthorised Modification: Do not open the enclosure or modify internal circuits. Tampering voids warranty and may cause unsafe operation.

• Environmental Limits: Do not operate outside –20 °C to +70 °C (standard) or –30 °C to +60 °C (marine)DEIF.

8. Maintenance & Storage

8.1 Regular Maintenance (Every 12 Months)

1. Visual Inspection: Check for loose terminals, damaged wiring, corrosion, or overheating signs (discolouration).

2. Cleaning: Wipe front panel with dry lint-free cloth; no liquid cleaners (avoid water ingress).

3. LED Check: Verify PWR/RUN/SYNC/ALARM/CAN/RS485 LEDs operate correctly.

4. Terminal Tightness: Retorque all terminals to 0.8–1.0 Nm.

5. Functional Test: Inject 3-phase voltage/current; verify synchronisation, protection thresholds, and relay operation.

6. Insulation Resistance: Voltage/CT inputs to ground ≥1 MΩ @ 500 VDC.

8.2 Storage Guidelines

• Packaging: Store in original anti-static packaging with desiccant.

• Environment: 10–30 °C, 30–70% RH, dry, clean, and dust-free.

• Protection: Avoid direct sunlight, extreme temperatures, and mechanical shock/vibration.

• Duration: Shelf life ≤5 years; inspect for ESD damage and test basic functions before use if stored longer.

9. Troubleshooting

10. Warranty & Disclaimer

• Model: SCM4-1 (SCM4.1) Synchronisation, Control & Measuring Module.

• Warranty Period: 24 months from delivery date (normal installation/use per manual).

• Warranty Exclusions: Misuse, overvoltage, lightning, water ingress, unauthorised modification, improper maintenance, or CT open-circuit faults.

• Specifications Subject to Change: Manufacturer reserves the right to update specifications without prior notice.

• Liability Limitation: Manufacturer is not liable for indirect or consequential damages (e.g., downtime, lost revenue, equipment damage).

• Documentation Version: 1.0 (2026); latest manual available at www.deif.com.