DEIF CSQ-3

Technical Specifications

• Frequency Operating Range: 40 Hz – 70 Hz
• Phase Measurement Accuracy: ±2 electrical degrees
• Phase Resolution Indicator: 10 electrical degrees per LED segment
• Rated Input Voltage (UN): 100–127 V AC ±20%, 220–240 V AC ±20%, 380–450 V AC optional
• Galvanic Isolation Strength: 3750 V AC, 50 Hz, 1 minute between all input/output groups and ground
• Main Synchronising Relay Contact Type: SPST-NO
• Relay Electrical Rating AC1: 8 A / 250 V AC
• Relay Electrical Rating AC15: 3 A / 250 V AC
• Relay Electrical Rating DC1: 8 A / 24 V DC
• Relay Electrical Rating DC13: 3 A / 24 V DC
• Mechanical Relay Service Life: 2 × 10⁷ operations
• Electrical Relay Service Life: 1 × 10⁵ operations under nominal load
• Marine Version Optocoupler Output: NPN transistor, max 40 V / 10 mA, fault de-assert logic
• Ambient Operating Temperature: -25 °C to +70 °C
• Nominal Calibration Temperature Band: -10 °C to +55 °C
• Storage Temperature Range: -40 °C to +70 °C
• Temperature Drift of Setpoints: Max ±0.2% full scale per 10 °C temperature shift
• Shock Resistance Standard: 15 g × 6 shocks in 3 orthogonal axes; peak impulse 50 g / 6 ms, 22 g / 20 ms
• Front Panel Cutout Dimension: 96 mm × 96 mm standard DIN square
• Terminal Wire Gauge Compatibility: Max 2.5 mm² copper conductor
• Weight: 0.42 kg

Function Features

1. Full circular LED array visualisation of generator-busbar phase offset, labelled TOO FAST / SYNC / TOO LOW / TOO HIGH voltage status
2. Front concealed pushbutton parameter programming via removable safety cover, no cabinet door opening required for setup
3. Custom programmable synchronising window threshold for voltage difference, frequency difference and phase angle
4. Dead bus synchronising logic for cold grid generator connection
5. High harmonic distortion immunity for unstable industrial power networks
6. Dual operating modes: Normal measuring mode / Parameter setting mode
7. Continuous overvoltage and undervoltage monitoring with LED status indication
8. Marine model dedicated fault diagnosis optocoupler remote signal output
9. Built-in EMC filtering compliant with CE industrial and marine electromagnetic standards
10. Real-time phase rotation detection and reverse phase blocking logic

Performance Parameters

• Unlimited maximum allowable frequency difference detection range
• Phase difference real-time refresh cycle: 10 ms
• Synchronising relay closing delay configurable from 0 ms to 10 s
• Overvoltage trip threshold adjustable from 100% to 130% UN
• Undervoltage trip threshold adjustable from 70% to 100% UN
• Frequency deviation window adjustable ±0.1 Hz to ±2 Hz

Material Composition

• Front panel: Flame-retardant ABS plastic, anti-UV coating
• Internal housing: Cold rolled steel sheet with anti-corrosion zinc plating
• Circuit substrate: FR4 high-temperature flame retardant PCB
• Terminal blocks: Glass-filled PA66 thermoplastic with copper silver-plated contacts
• LED indicators: High-brightness red industrial light-emitting diodes

Structural Characteristics

• Standard 96×96 mm panel embedded mounting structure
• Fully enclosed front panel with transparent scratch-resistant polycarbonate protective window
• Rear terminal wiring compartment isolated from measurement circuit zone
• Modular internal circuit layout: Signal acquisition board, microprocessor mainboard, relay output subboard
• IP30 front panel protection rating, IP20 rear terminal compartment
• Anti-vibration integrated metal fixing brackets for marine vessel installation

Working Principle

1. Dual three-phase voltage sampling circuits acquire generator voltage and busbar voltage signals with galvanic isolation transformers
2. Analog signal conditioning converts raw AC waveforms into digital pulse signals for 32-bit microprocessor sampling
3. Real-time FFT algorithm calculates frequency, RMS voltage and phase angle offset between two voltage sources
4. Digital logic compares measured deviation values against user-programmed threshold parameters
5. When all synchronising conditions fall within set window, main SPST relay energises to output closing command for generator circuit breaker
6. Circular LED array sequentially illuminates corresponding segments based on calculated phase difference to visualise synchronisation progress
7. Fault monitoring circuit triggers optocoupler output when input overvoltage, undervoltage or hardware failure occurs

Advantage Highlights

1. Class-leading ±2° phase measurement precision for reliable zero-crossing paralleling
2. Front concealed programming buttons eliminate high-voltage exposure risks during commissioning
3. Full 3750 V galvanic isolation eliminates ground loop interference in multi-generator systems
4. Marine-grade shock and temperature resistance compliant with HSE DIN40040 marine environmental standards
5. Dead bus function eliminates separate auxiliary relay hardware for cold grid startup
6. Low temperature drift maintains stable setpoint accuracy across wide ambient temperature range
7. High harmonic filtering enables stable operation with variable speed diesel generator sets
8. Long mechanical relay lifespan reduces field replacement frequency

Applicable Industries

Installation Requirements

1. Mount into standard 96×96 mm square instrument panel cutout with four corner locking clips
2. Maintain minimum 50 mm clearance between rear terminal blocks and cabinet wiring harnesses
3. Vertical mounting only; horizontal or inverted installation prohibited to avoid LED viewing distortion
4. Separate signal wiring and power wiring into dedicated cable trays to reduce electromagnetic interference
5. Earth rear chassis grounding terminal to cabinet protective earth busbar with 2.5 mm² copper wire
6. Do not install adjacent to high-current contactors or variable frequency drives without EMC shielding barriers
7. Marine installation requires additional vibration damping rubber gaskets between panel and instrument housing

Usage Notes

1. Calibrate voltage and frequency setpoints per generator manufacturer technical specifications before first commissioning
2. Avoid continuous operation above +60 °C ambient temperature to prevent accelerated LED luminance degradation
3. Clean front polycarbonate window only with alcohol-free microfiber cloth to prevent surface scratch damage
4. Disconnect all voltage input terminals before opening cabinet for maintenance to eliminate 400 V AC shock hazards
5. Marine variant optocoupler output must connect to external 24 V DC pull-up resistor circuit
6. Replace internal relay when electrical operation count exceeds 1 × 10⁵ nominal cycles to avoid contact welding failure
7. Do not modify internal PCB wiring; all parameter adjustments limited to front panel programming interface