- over/under voltage, voltage surges and fluctuations,

- phase loss,

- phase combination,

          - wrong phase sequence,

          - phase imbalance in the AC power circuits.

The RNPP-302 operates with the magnetic coil of the external contactor which in it's turn operates with the

power load. The RNPP-302 constantly checks (before and after turning on) the condition of the power

contacts of magnetic contactor and detects the stuck together and burned contacts. When the power

parameters return back to normal after the interruption or when the reason of the tripping is eliminated the

RNPP-302 performs automatic reclosing and thus restart the equipment. It does so following a time delay (0-

600 sec), set previously by the user.

RNPP-302 relay may work in four independent modes:

1. phase loss monitoring mode without voltage level control (parameter tPr = 0);

2. minimum voltage monitoring mode (parameter tPr = 1);

3. maximum voltage monitoring mode (parameter tPr = 2);

4. symmetrical min/max voltage monitoring mode (parameter tPr = 3)

The LED display of the RNPP-302 indicates:

- Acting value of the phase voltage or alternatively line voltage depending on mode of operation;

- Voltage fault in mains power supply and the type of the interruption;

- Status of output relay (OPEN/CLOSED)

NOTICE. The term rated voltage used in this device manual mean that the input voltage

Main Features

1.1. Digital input to turn ON/OFF the RNPP-302 remotely ;

1.2. Changeover relay output (8A 250V at cos _=1) for the operation by the magnetic contactor to

commutate any desired power load;

1.3. Normally Opened relay contact (8A 250V at cos _=1) for the signalization

1.4. Accuracy of tripping thresholds measurement: not exceed 3V

1.5. Rated phase/line voltage 220/380V (230/400V)

1.6. The adjustment ranges for minimal voltage; maximal voltage tripping; phase imbalance; time

delays for the protection tripping; automatic restart (reclosing) time and other adjustable

parameters are shown in Table 2.

1.7. Rated power: not exceed 5 W

1.8. Protection degree of the outer case: IP40

1.9. Protection degree of terminal block: IP20

1.10. Operational temperature range, ï‚°C: from - 35 to +55

1.11. Storage temperature conditions, ï‚°C: from - 45 to +75

1.12. Weight not more than 0,3 kg

1.13. Mounting: to standard 35 mm DIN-rail

1.14. Mounting position: arbitrary - as per requirement.

RNPP311-M can also be used similar to RNPP-302 but the only difference in this relay is that it is non digital and cannot switch OFF the load in case of burnt contactor contacts.

RNPP-311-M can also be used as Automati cphase sequence corrector