The RNPP-311M is a multifunctional voltage monitoring relay designed to protect electrical equipment from various power supply anomalies. It continuously monitors voltage parameters in 400V/415V three-phase circuits and provides protection against undervoltage, overvoltage, phase imbalance, phase sequence errors, and phase loss.
Function Description
The RNPP-311M operates by continuously monitoring the voltage parameters of a three-phase circuit. It is equipped with a microprocessor-based scheme that ensures high accuracy and reliability. The device can be configured to trip the load when voltage parameters deviate from user-defined thresholds.
Key functions include:
- Permissible voltage level control: Monitors for undervoltage (Umin) and overvoltage (Umax) conditions.
- Control of correct phase sequence, phase loss, and phase coincidence: Detects incorrect phase rotation or complete loss of one or more phases.
- Phase imbalance control: Monitors for excessive voltage imbalance between phases.
- Adjustable tripping time delay (Toff): Allows setting a delay before tripping the load, preventing nuisance trips from momentary fluctuations.
- Adjustable autoreclosing time delay (Ton): Enables automatic re-connection of the load once voltage parameters return to normal, after a user-defined delay.
- Manual control: The device can be manually turned ON or OFF.
- Output contacts: Provides two independent groups of output changeover contacts (1-2-3 and 3-4-5) for controlling external contactors or circuit breakers.
- LED indication: Features green LEDs for LINE status and a red LED for ALARM status, providing visual feedback on the device's operational state and detected anomalies.
The device is designed to operate in a wide range of industrial and commercial applications, protecting motors, pumps, and other sensitive equipment from damage due to power supply issues. It can be used in both 400V and 415V power circuits, selectable via a switch.
Important Technical Specifications
Rated line/phase voltage: 400/230V, 415/240V
Rated frequency: 50 Hz
Harmonical configuration (nonsinusoidality) of power supply voltage: EN 61000-3-2 (IEC 1000-3-2)
Adjustable range for Umax/Umin, % of nominal value Unom: 5 - 50%
Adjustable Tripping time delay (Toff): 0 - 10 seconds
Adjustable Autoreclosing time delay (Ton): 0 - 600 seconds
Fixed time delay for tripping in case MIN voltage fault detected (time delay for Umin): 12 seconds
Reaction time in case of phase loss, sec (not more): 0.2 seconds
Readiness time on energizing the RNPP-311M, sec (not more): 0.2 seconds
Phase imbalance value, V: 60V
Voltage hysteresis, V: 5 - 6V
Phase imbalance hysteresis, V: 5 - 6V
Accuracy for voltage tripping threshold measurement, V (not more): 3V
Accuracy for phase imbalance measurement, % (not more): 5%
Protection class against electric shock: II
Permissible contamination level: II
Overvoltage category: II
Nominal voltage of isolation, V: 450V
Operational voltage range, % of rated voltage: from 50 to 150%
Rated impulse withstand voltage, kV: 2.5 kV
Power consumption (under power load), VA (not more): 3.0 VA
Maximal current that output contacts may commutate, A: 5A
Cross-section area of connection terminals, mm²: 0.5 – 2 mm²
Maximum torque of terminal fixing, N*m: 0.4 N*m
Commutation endurance for the output contacts:
- under 5A power load, not less than 100000 times
- under 1A power load, not less than 10000000 times
Protection degree:
- for the device: IP40
- for the terminals: IP20
Operational temperature range: from -35 to +55 °C
Storage temperature conditions: from -45 to +60 °C
Weight, kg (not more): 0.200 kg
Overall Dimensions, mm: 35 x 93 x 68 mm
Standard 35 mm DIN rail mounting: Yes
Mounting position as per requirement (arbitrary): Yes
The device can maintain operability even if the voltage is present only on one of the phases and the external power supply of 24V is absent, provided the voltage is at least 140V.
Usage Features
The RNPP-311M is designed for easy installation on a standard 35mm DIN rail. Its front panel features three adjustment knobs and five toggle switches for configuration.
Adjustment Knobs:
- Unom±%: Combined adjustment for minimal/maximal voltage tripping thresholds as a percentage of nominal voltage.
- Toff: Tripping time delay setting for all alarm situations, except when voltage on any phase drops below 100V. A minimum of 1 second is recommended to avoid nuisance trips.
- Ton: Autoreclosing time delay for automatic load re-connection after voltage parameters return to normal.
Toggle Switches (4-8):
- 400/415V: Selects the desired power circuit standard.
- SEQ: Enables detection of wrong phase sequence or phase coincidence.
- IMB: Enables detection of phase imbalance.
- Umin: Enables undervoltage protection (voltage lower than user-adjusted Umin).
- Umax: Enables overvoltage protection (voltage higher than user-adjusted Umax).
LED Indications:
- Green LINE LEDs: Indicate the presence of voltage on each phase.
- All LEDs ON: Voltage parameters normal.
- Blinking of any (all) LEDs: Voltage rise on the corresponding phase.
- Any (all) LEDs OFF: Voltage level on any (all) phases is lower than adjusted value or below 100V, or phase loss.
- Blinking of two LEDs alternately: Phase imbalance alarm.
- Left, Middle, then Right LEDs turn ON one by one: Wrong phase sequence or phase coincidence alarm.
- Red ALARM LED:
- Absent luminescence: No alarm.
- Blinking: Autoreclosing time delay in progress.
- Continuous luminescence: Alarm condition (e.g., undervoltage, overvoltage, phase imbalance, wrong sequence).
The device supports both 24V AC/DC external power supply and internal power supply derived from the monitored circuit. It is crucial to set the device parameters correctly according to the specific application requirements. For optimal performance, it is recommended to avoid breaking or turning the knobs with excessive force during adjustment.
Maintenance Features
The RNPP-311M is designed for long-term reliable operation with minimal maintenance.
- Durability: The device has a service life of 10 years and a guaranteed storage life of 3 years. The warranty period is 36 months from the date of sale.
- Cleaning: The manual recommends cleaning the device with a dry cloth. Do not use abrasives or organic compounds for cleaning (spirit, gasoline, solvents, etc.).
- Repair: In case of malfunction, the manufacturer will repair or replace the unit if the damage is caused by electric current or voltage in excess of the permissible values as indicated in the operating manual. Warranty service is provided at the place of purchase.
- Storage: The device should be stored in a factory package in enclosed rooms with ambient temperature from -45 to +60 °C and exposed to not more than 80% relative humidity. It should be free from fumes that may exert a deleterious effect on the package and the RNPP-311M components.
The RNPP-311M is a robust and reliable solution for comprehensive voltage monitoring and protection in industrial and commercial settings.
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