Three Phase Voltage Monitoring Relay VMR4p Dinrail :
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.
VMR 4 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.
VOLTAGE MONITORING RELAY- VMR 4 (SINGLE PHASE SPP)
SALIENT FEATURES :
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Microcontroller based technology.
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Voltage protection along with digital voltage readout.
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Wide range of supply variation.
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Unit will also work if any one phase is present.
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Protection against Under voltage.
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Protection against Over voltage.
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Single Phasing & Reverse Phasing protection.
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All the set points setable by keys.
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Phase unbalance protection.
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Trip Delay for Under voltage & Unbalance is settable
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Reverse Phasing Protection can be able
to bypass through settings.
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Indications for Low voltage , High Voltage,
SPP & Relay ON .
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Message Display for SPP, Reverse Phasing
& Unbalance Faults.
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No separate auxiliary supply required.
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Hold feature:- Press INC key in Running
condition to observe particular supply voltage.
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Neutral Protection feature i.e. If one of the phase get
connected to neutral then there will be no
damage to the unit.
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
WORKING
- Hold feature:- Press INC key in Running condition to observe particular supply voltage.
To go into scroll mode press INC key again.
