Our Products
 
Three Phase Voltage Monitoring Relay - VMR 3P :
 
 
Protection of 3 Phase devices against Over voltage, Under voltage,Single Phasing, Reverse Phasing & unbalance supply are one of the major issue in electrical systems. For safe running of 3-phase devices, special protections that keep a continuous watch on supply conditions are very essential. The major cause of maxium load burn-out is overloading which occurs due to unbalance supply, Single Phasing & Reverse Phasing conditions.
 
VMR3P detects such Conditions & protect the load from burn out. 'PROTON's LVM 3P' offer above protections along with 3 digit display showing R-Y,Y-B,BR voltages in scanning mode with precise accuracy. LOW/HIGH voltage tripping to ensure trouble free running of 3-phase Loads.
 
SALIENT FEATURES :

Microcontroller based technology.

Voltage protection along with digital voltage readout.

Wide range of supply variation.

Unit will also work if any one phase is present.

Protection against Under voltage.

Protection against Over voltage.

Single Phasing & Reverse Phasing protection.

All the set points setable by keys.

Phase unbalance protection.

Trip Delay for Under voltage & Unbalance is settable

Reverse Phasing Protection can be able to bypass through settings.

Indications for Low voltage , High Voltage, SPP & Relay ON .

Message Display for SPP, Reverse Phasing & Unbalance Faults.

No separate auxiliary supply required.

Hold feature:- Press INC key in Running condition to observe particular supply voltage.

 
TECHNICAL SPECIFICATION :

Supply voltage

3 Phase 415 VAC, 50 Hz (R,Y,B &N) (No auxilliary supply)

Output Contacts

Two changeover ( C-NO),Rating 5A at 230VAC

Voltage trip setting

: Lower Limit is 340 for Under voltage (Resolution of 1 Volt)
: Upper Limit is 460 Volts for OV (resolution of 1 V)
( Hysterisis between cut off & cut in is 10V)

Trip Time delay

Trip time Less than 100msec.for SPP, Reverse Phasing
& Over Voltage
Trip Time is settable for Under Voltage & Unbalance..

ON Delay

Selectable by keys from 1 to 60 sec.

Reset Mode

Auto reset.

Indications

SPP : RED LED
OVER VOLTAGE : RED LED
UNDER VOLTAGE: RED LED
RELAY ON : GREEN LED

Keys

[ SET ] FUNCTION key, To select a set point function.

 

[ /\ ] INC key, To increment set point.

 

[ \/ ] DEC key, To Decrement set point.

Operating Temperature range

-5 0C to 60 0C.

Relative Humidity

10 to 95%

Mounting

Din rail. : Base mounting dimensions
55 (W) x 65 (L) x 125 (D) mm.

 
 

WORKING :

In the normal run mode, display shows Voltages Vry,Vyb,Vbr for 10 sec. each
If the supply is within the range then On Timer starts decrementing on display
& after Set On Time over Relay will be ON.

If Over voltage,Under voltage or spp/reverse phasing/unbalance occurs in the supply then Relay will be OFF & corresponding

fault LED starts blinking.
Hysterisis betwen Cut off & cut in is 10V

- Hold feature:- Press INC key in Running condition to observe particular supply voltage. To go into scroll mode press INC key again.