PF maestro SPF-21YS Series
PF maestro SPF-21YS Series
PF maestro – SPF-21YS Series is a next-generation intelligent 1CT & 3CT real-time power factor controller designed to deliver precision fundamental reactive energy control, kVAH billing optimization. It offers real-time measurement of supply, ensuring unparalleled accuracy, system harmonic analysis up to the 31st order, and programmable control modes, this product series adapts seamlessly to both low voltage and medium voltage power networks and maximum demand control indication. Its communication platform (RS-485) ensures future-proof integration into SCADA and energy management systems. Comprehensive protections, predictive maintenance tools, and field-upgradable firmware make this product series the ideal solution for industries seeking reliability, energy efficiency, and a smarter way to manage their electrical infrastructure.
Our Product Features
Real-time Automatic Displacement Power Factor (D-PF) Correction
SPF-21YS intelligently switches capacitor banks to maintain a programmable target PF up to three decimal places, ensuring optimal energy efficiency, improved voltage stability, and reduced utility penalties across dynamic industrial loads.
Demand Controller with Programmable Integration Window and kW Limit
Monitors active power demand (kW) with Class 1.0 accuracy, applying an adjustable integration window from 1 to 60 minutes to detect peaks early and selectively disconnects capacitor banks or activates auxiliary relay outputs to shed external loads, enabling users to avoid exceeding contractual maximum demand limits without manual intervention while maintaining plant reliability.
Comprehensive Electrical Parameter Measurement
Continuously measures Voltage, Current, Active Power (kW), Reactive Power (kVAR), Apparent Power (kVA), Distortion Power (D,Dx), Frequency (45–65Hz), Power Factor (DPF & PF), and Harmonics (up to 31st order). This is under IEC-62053 part 21 & 23 Class 1.0 accuracy, providing a comprehensive overview of power system performance and power quality
Auxiliary Control Voltage Monitoring for Enhanced System Protection
Monitors auxiliary supply voltage used for capacitor switching contactor coils. It inhibits capacitor switching during low-voltage events, preventing harmful contactor chattering, coil overheating due to over-voltage and premature mechanical or electrical failure of critical panel components like cooling fans,instrumentation supply etc., thereby extending the lifetime various devices within Auto PF correction system.
Programmable Capacitor Discharge Time Enforcement
Ensures safe capacitor recharging by applying programmable discharge delays between 2 and 7299 seconds, which prevents reconnection under residual voltages, thereby protecting capacitors, contactors, and overall system stability during rapid compensation cycles.
Capacitor Step Utilization Tracking and Predictive Maintenance Support
Tracks switching ON counts and cumulative ON-time in minutes for each capacitor step, calculating a Utilization Count that enables predictive maintenance scheduling, thus preventing unexpected step failures and maximizing the lifespan of capacitors, detuned reactors and switching devices.
Capacitor Health Monitoring Without Additional Current Sensors
Analyzes VAR contribution per switching operation to detect faulty capacitors without needing extra CTs, saving installation costs while maintaining system integrity.
Advanced Harmonic Distortion Monitoring up to 31st Order
Measures voltage THD% and current TDD% harmonic levels. It even monitors the capacitor current THD% & values. Detects and helps mitigate harmonic-related power quality issues,protecting system components.
Flexible Wiring Topologies with Automatic Adaptation
Supports 3CT/4Wire, 2CT/3Wire, and 1CT/2Wire configurations, allowing easy adaptation to standard LV panels or transformer secondary monitoring without special rewiring, making installations faster, safer, and more cost-efficient.
Automatic and Manual Current-Voltage Wiring Synchronization
Corrects CT polarity, phase sequencing and capacitor bank sizing internally without requiring rewiring, reducing installation errors and commissioning time. Additionally provides the facility to manually synchronize the voltage and current connections without physical wiring termination change.
Wide Auxiliary Supply Range of 90-485V AC
The wide voltage range ensures the meter continues to function safely even during voltage fluctuations, preventing unexpected shutdowns or failures that could lead to electrical hazards, overheating, or damage to connected equipment.
Advanced Fault Detection with Programmable Fault Handling
Advanced monitoring of over 100 fault & events conditions critical to power factor correction systems, including undervoltage (UV), overvoltage (OV), overcurrent (OC), earth faults, auxiliary voltage loss, and over-temperature conditions. With programmable fault handling, users can define specific response action - Log Only, Normal Trip, or Instant Trip to align with system importance and safety. The fault limits and resume limits setting as per site conditions ensures safe, efficient operation of the APFC panel.
User-Friendly 2-Line LCD Display with 7-Key Navigation Keypad
Facilitates easy parameter viewing and device configuration even in poor lighting conditions.
Rugged IP54 Fire-Retardant Housing with Full Compliance
Engineered with fire-retardant ABS material, IP54 front protection, and compliance with IEC 61326-1 EMC, CE, and RoHS3 standards, ensuring reliable and safe operation in harsh industrial conditions.
Technical Specifications
| Function | Parameter | Condition | Minimum | Maximum |
|---|---|---|---|---|
| Measurement | ||||
| Supply | Voltage (V) Sinusoidal |
3-Phase & Neutral - fundamental 3-Phase (3-wire) - fundamental 2-Phase - fundamental 1-Phase & Neutral - fundamental |
50V~ L-N 85V~ L-L 85V~ L-L 50V~ L-N |
315V~ L-N 550V~ L-L 550V~ L-L 315~ L-N |
| Current (I) Sinusoidal |
5 Amp IN: - fund. 1 Amp IN: - fund. |
75mA(CL-2),5mA-min 200mA(CL-2),5mA-min |
7.5 Amp 1.5 Amp |
|
| Frequency | Frequency (Hz) (Fundamental Supply Voltage measurement of frequency) |
47Hz (for 50Hz) 57Hz (for 60Hz) meas range 45Hz |
53Hz (for 50Hz) 63Hz (for 60Hz) meas range 65Hz |
|
| Power / Energy | IEC-62053 pt.21 & 23 4 quadrant measurement |
5Amp range: Class 2: P & Q 1Amp range ≥200mA: Class 2 P & Q |
||
| Maximum Demand |
S (VA) 1 min sliding window P (W) Window time user set |
Window time 5 - Minutes | Window time 60 - Minutes | |
| Harmonics |
Voltage - L-L & L-N Current - per L (RYB) & N |
Spectrum: 2nd to 31st Harmonic. For Voltage and Current. | ||
| VA Burden |
Voltage at 550V~ L-L Voltage at 415V~ L-L Current at 7.5Amp~ S-CT Current at 5.0Amp~ S-CT Current at 1.0Amp~ S-CT |
<1.13VA per ph., <3.40VA total 3-ph <0.65VA per ph., <1.95VA total 3-ph <0.65VA per ph., <1.95VA total 3-ph <1.0VA per ph., <3.0VA total 3-ph <0.5VA per ph., <1.5VA total 3-ph <0.05VA per ph., <0.15VA total 3-ph |
||
| Capacitor Control | ||||
|---|---|---|---|---|
| PF Correction | Target PF | Displacement Power Factor setting | Inductive: 0.000 | Capacitive: 0.000 |
| VAR margin | Smallest capacitor bank VAR … X | … X 1.1 | … X 9.9 | |
| Offset to target | % above the target PF setting | 0% | 100% | |
| ON/OFF control | Algorithm | Optimal value to target. | Single target PF with adjustable No action VAR tolerance band | |
| Bank Utilization | Limit = (Number of switch ON / C) + (On duration in Minutes / T) |
C = 01(00 for Disb.) T = 01(00 for Disb.) |
C = 99 T = 99 |
|
| High Speed Pull-up Solid State switching |
Group of 5 numbers (3-groups) + Transistor switched high speed on/off |
Voltage: +10Vdc Amp: 0mA dc |
Voltage: +24Vdc Amp: 30mA dc (<2.5V drop) Current limit: 32–40mA |
|